Xiang Ma

Bis-p-Sulfonatocalix[4]arene-Based Supramolecular Amphiphiles with an Emergent Lower Critical Solution Temperature Behavior in Aqueous Solution and Hydrogel

Co-reporter:Xi Wang;Tao Jiang;He Tian;Xuyang Yao

Langmuir December 29, 2015 Volume 31(Issue 51) pp:13647-13654

Publication Date(Web):2017-2-22

DOI:10.1021/acs.langmuir.5b04083

An unexpected lower critical solution temperature (LCST) phenomenon is observed in a bis-p-sulfonatocalix[4]arene-based supramolecular amphiphile system, and the mechanism of this intriguing phenomenon is studied. The unusual macroscopic thermoresponsive behavior is based on the switch of the system from water-soluble assemblies to insoluble netlike cross-linked nanoparticles under temperature stimulus, which is regulated by multiple weak interactions, including hydrophilic and hydrophobic interactions, π–π stacking, and host–guest recognition. By using the LCST solution as the dispersion medium, a hydrogel with LCST behavior can be fabricated. This work contributes toward better understanding about calixarene-induced aggregation (CIA) and thermoresponsive self-assembled systems. It will also help to enrich the designing of complexed supramolecular amphiphile systems and develop their potential applications in hydrogels.

A photocontrollable supramolecular hyperbranched polymer based on host-guest recognition in aqueous solution

Co-reporter:Lei Zou, Zhiyi Yuan, Dongdong Chang, Xiang Ma

Dyes and Pigments 2017 Volume 143(Volume 143) pp:

Publication Date(Web):1 August 2017

DOI:10.1016/j.dyepig.2017.04.027

•New photo-controlled hyperbranched system was prepared by host-guest interaction.•The polymerization and morphology of supramolecular polymer were investigated.•Planar supramolecular network had been constructed on smooth plane by spin-coating.A novel supramolecular hyperbranched polymer had been fabricated conveniently through host-guest recognition based on Cucurbit[8]uril in aqueous solution. The three branched monomer contained an azobenzene unit and a viologen moiety on each of its branch. The polymerization of the supramolecular polymer in water could be controlled by tuning the isomer ratio of azobenzene groups of the guest monomers upon the competitive irradiation of lights. In addition, the strictness of the structure could be adjusted by varying the molar ratio between host and guest monomers. Planar supramolecular network had been constructed by drying the solvent of the solution of supramolecular hyperbranched polymers on smooth plane. The research provided a promising way to conduct dual-responsive supramolecular polymerization.A novel photo-controllable supramolecular hyperbranched polymer system had been constructed based on cucurbit[8]uril recognized azobenzene and positively charged viologen.Download high-res image (133KB)Download full-size image

Reversible end-to-end assembly and disassembly of gold nanorods based on pH-responsive host-guest interaction

Co-reporter:Yun Xu, Xi Wang, Xiang Ma

Dyes and Pigments 2017 Volume 145(Volume 145) pp:

Publication Date(Web):1 October 2017

DOI:10.1016/j.dyepig.2017.06.034

•The end-to-end assembly of GNRs was effectively realized by using a new supramolecular host-guest linker.•The reversible end-to-end assembly and disassembly of GNRs were efficiently realized by utilizing the pH-responsive host-guest interaction.•The end-to-end assembly and disassembly of GNRs were thoroughly investigated.The reversible end-to-end assembly and disassembly of gold nanorods (GNRs) were efficiently realized by utilizing the pH-responsive host-guest interaction. The guest compound, containing a 4,4'-bipyridine unit and a disulfide group, was synthesized, and could form the 2:1 inclusion compounds with cucurbit[8]uril (CB[8]) host molecules quickly in aqueous solution. Due to the fact that the inclusion compounds could be destroyed and re-formed by adjusting the solution pH, the terminal-modified GNRs could realize the reversible end-to-end assembly and disassembly. The end-to-end assembly and disassembly of GNRs were well characterized by UV–Vis spectra and TEM images. This method, employing supramolecular host-guest interaction to control the reversible linear assembly and disassembly of GNRs, may provide a new idea for the design of smart organic-inorganic hybrid materials.Download high-res image (120KB)Download full-size image

Synthesis and properties of tetraphenylethylene derivatived diarylethene with photochromism and aggregation-induced emission

Co-reporter:Huan Dong, Miao Luo, Sheng Wang, Xiang Ma

Dyes and Pigments 2017 Volume 139(Volume 139) pp:

Publication Date(Web):1 April 2017

DOI:10.1016/j.dyepig.2016.11.054

•Introducing tetraphenylethylene and triphenylethylene into bisthienylethene (BTE) molecules.•BTE-AIE compounds show excellent aggregation-induced emission properties.•BTE-AIE compounds exhibit good photochromism upon alternative UV and visible irradiation.A series of new diarylethene compounds with both photochromism and aggregation-induced emission have been synthesized by connecting tetraphenylethene and triphenylethene to the bisthienylethene. All the four compounds exhibit good photochromism upon irradiation with alternative UV and visible light. And they are all provided with aggregation-induced emission properties in tetrahydrofuran solution with different fraction of water, non-emissive in the pure tetrahydrofuran solution but yellowish green fluorescence in the aggregate or solid state. Furthermore, the compounds connecting tetraphenylethene to the bisthienylethene were found to exhibit the stronger fluorescence emission in the aggregate or solid state than the ones connecting triphenylethene to the bisthienylethene.Download high-res image (223KB)Download full-size image

Synthesis and properties of photochromic spirooxazine with aggregation-induced emission fluorophores polymeric nanoparticles

Co-reporter:Xue Li, Chengpeng Li, Sheng Wang, Huan Dong, Xiang Ma, Derong Cao

Dyes and Pigments 2017 Volume 142(Volume 142) pp:

Publication Date(Web):1 July 2017

DOI:10.1016/j.dyepig.2017.03.068

•Fluorescent photochromic polymeric nanoparticles with aggregation-induced emission were synthesized via semi-continuous emulsion polymerization.•The obtained polymeric nanoparticles have advantages of uniform size and narrow particle size distribution.•Fluorescence intensities of the P2 could be reversibly changed with irradiation of UV and visible light.We designed and synthesized photochromic fluorescent poly (MMA-co-SPO-co-TPE) nanoparticles with pendant spirooxazine (SPO) dye and tetraphenylethylene (TPE) fuorophores attached to poly (methyl methacrylate) (MMA) backbone by semi-continuous polymerization. The polymerization reactions were accomplished in water with randomly methylated-β-cyclodextrin (β-CD) at 80 °C in the presence of potassium peroxodisulfate which can be used as free radical initiator. This new synthetic method leads to uniform and smooth nanoparticles with a narrow particle size distribution. In addition, the poly (MMA-co-SPO-co-TPE) nanoparticles exhibit aggregation induced emission (AIE) properties and excellent photochemical properties because of spirooxazine dyes convert reversibly to merocyanine form upon ultraviolet (UV) irradiation, which active the intramolecular energy transfer pathway and quench the fluorescence of TPE in polymers. Consequently, the fluorescence of the poly (MMA-co-SPO-co-TPE) nanoparticles can be reversibly switched “on” and “off” upon UV and visible light, which maybe have potential application in biological fluorescent labeling as well as in optical fields like individually light–addressable nanoscale devices.Download high-res image (388KB)Download full-size image

Efficient end-to-end assembly of gold nanorods via cyclodextrin-bisphenol A based supramolecular linker

Co-reporter:Yun Xu, Xi Wang, Xiang Ma

Dyes and Pigments 2017 Volume 144(Volume 144) pp:

Publication Date(Web):1 September 2017

DOI:10.1016/j.dyepig.2017.05.037

•The end-to-end assembly of gold nanorods was effectively realized.•A novel cyclodextrin-Bisphenol A based supramolecular linker was used.•The linear assembly of gold nanorods was thoroughly investigated and confirmed.The efficient end-to-end assembly of gold nanorods (GNRs) was realized via a new host-guest supramolecular linker consisting of a bisphenol A (BPA) guest molecule and two mono-(6-mercapto-6-deoxy)-beta-cyclodextrin (HS-CD) host molecules. The end-to-end assembly of GNRs was thoroughly characterized by UV-Vis spectra and TEM images. With the time prolonged, the longitudinal plasmon absorption peak of GNRs gradually shifted toward the longer wavelength, which indicated the formation of end-to-end assembly of GNRs. TEM images also showed that GNRs assembled predominantly in an end-to-end manner. Since the BPA and HS-CDs are all commercially available, this extremely simple and convenient method may have potential and important application to build linear functional nanodevices.Download high-res image (183KB)Download full-size image

Room-temperature phosphorescence of cucurbit[7]uril recognized naphthalimide derivative

Co-reporter:Lei Xu, Lei Zou, Hui Chen, Xiang Ma

Dyes and Pigments 2017 Volume 142(Volume 142) pp:

Publication Date(Web):1 July 2017

DOI:10.1016/j.dyepig.2017.03.044

•A novel room-temperature phosphorescence system via host-guest interaction was constructed.•The phosphorescence emission and lifetime of the system were thoroughly investigated.•The binding pattern and constant between cucurbit[7]uril and guest was determined.It is well known that most purely organic molecules give out no room-temperature phosphorescence due to consuming the energy of molecular vibration, inefficient spin-orbit coupling and easy-quenched radiation relaxation process. Room-temperature phosphorescence emission was presented by the host-guest interactions between cucurbit[7]uril and a naphthalimide derivative 2-(4-aminobutyl)-6-bromo-1H-benzo[de]isoquinoline-1,3(2H)-dione. This cucurbit[7]uril recognized supramolecular system can emit room-temperature phosphorescence signal in aqueous solution, as well as the 4-bromo-1,8-naphthalic anhydride polymer/cucurbit[7]uril system. The conformation of the complex was established by 1H-1H ROESY NMR techniques. The binding patterns and constant of this supramolecular system were well defined, and its photophysical and photochemical properties found in detail as well.Download high-res image (136KB)Download full-size image

Tunable emission of a tetraphenylethylene copolymer via polymer matrix assisted and aggregation-induced emission

Co-reporter:Chengjie Zhang;Xuyang Yao;Jie Wang

Polymer Chemistry (2010-Present) 2017 vol. 8(Issue 33) pp:4835-4841

Publication Date(Web):2017/08/22

DOI:10.1039/C7PY01013C

A novel polyacrylamide (PAM) copolymer possessing tetraphenylethylene (TPE) AIEgens was synthesized, which exhibited tunable fluorescence emission under different solvent conditions. Different from traditional AIEgens showing strong fluorescence in poor solvents but relatively weak emission in good solvents, the present polymers are emissive under both circumstances. The mechanism was due to the fact that hydrogen bonding in the copolymer matrix played an important role in providing a rigid environment and blocking the non-radiative pathway thereby strengthening fluorescence emission under certain conditions. The different solution ratios of H2O/DMF had a great impact on the fluorescence intensity of the polymer. Moreover, the ternary copolymer incorporating Rhodamine B (RhB) and TPE into the PAM exhibited tunable and multicolor emissions including a white-light one in solvents with various ratios of H2O/DMF.

End-to-end assembly and disassembly of gold nanorods based on photo-responsive host–guest interaction

Co-reporter:Jie Wu;Yun Xu;Dengfeng Li;He Tian

Chemical Communications 2017 vol. 53(Issue 33) pp:4577-4580

Publication Date(Web):2017/04/20

DOI:10.1039/C7CC01678F

The host–guest interaction based on thiol-β-cyclodextrin and a symmetric compound containing two azobenzene units on ends has been utilized to form end-to-end assembly of gold nanorods. Both UV light irradiation and guest competition can be used to transform the GNR alignments in a disassembled manner.

Multicolor Photoluminescence Including White-Light Emission by a Single Host–Guest Complex

Co-reporter:Qi-Wei Zhang, Dengfeng Li, Xin Li, Paul B. White, Jasmin Mecinović, Xiang Ma, Hans Ågren, Roeland J.M. Nolte, and He Tian

Journal of the American Chemical Society 2016 Volume 138(Issue 41) pp:13541-13550

Publication Date(Web):September 21, 2016

DOI:10.1021/jacs.6b04776

Achieving multicolor photoluminescence, especially white-light emission, under mild conditions based on a single fluorescent compound is a great challenge. Herein, we report a novel colorful-emission host–guest complex BPCY, which is composed of a two-arm fluorescent guest molecule (BPC) and γ-cyclodextrin (γ-CD) as the host molecule. BPC bears a unique asymmetrical donor–acceptor–donor (D1-A+∼D2)-type structure, where D1, A+, and D2 stand for the binaphthol electron donor, pyridinium electron acceptor, and coumarin electron donor, respectively. The luminescence property of BPC shows dual-sensitivity, i.e., toward the excitation wavelength and the cyclodextrin host molecule. Under certain conditions, the complex shows three different emission wavelengths, allowing the realization of multicolor photoluminescence, including red (R), green (G), and blue (B) as well as various intermediate colors by orthogonally modulating these two stimuli. In this way, nearly pure white-light emission with CIE coordinates (0.33, 0.34) could be generated. A combination of structural, spectroscopic, and computational simulation studies revealed the occurrence of synergetic mechanistic processes for the stimuli-responsive multicolor luminescence of the BPCY complex, namely, host-enhanced intramolecular charge-transfer (ICT) and host-induced restriction of intramolecular rotation (RIR). This new supramolecular complex with superior multicolor emission abilities may find wide applications in the fields of information processing and display media. Furthermore, the molecular design rationale presented here may provide a new design strategy for the development of high performance optical materials using a single supramolecular platform.

A room temperature phosphorescence encoding [2]rotaxane molecular shuttle

Co-reporter:Xiang Ma, Jing Zhang, Jingjing Cao, Xuyang Yao, Tiantian Cao, Yifan Gong, Chunchang Zhao and He Tian

Chemical Science 2016 vol. 7(Issue 7) pp:4582-4588

Publication Date(Web):29 Mar 2016

DOI:10.1039/C6SC00769D

A novel bistable molecular shuttle, composed of a Pt(II) porphyrin-containing dibenzo[24]crown-8 macrocycle threaded onto two different recognition sites (secondary dialkylammonium (NH2+) and 4,4′-bipyridinium (Bpym2+) units), and the anthracene (Anth) moiety as one terminal stopper, was synthesized by click chemistry. Its acid–base switchable shuttling could be addressed by both the room temperature phosphorescence (RTP) emission signals of the Pt(II) porphyrin moiety and the fluorescence emission of the Anth unit, as well as their lifetime changes. When the macrocycle was switched to be located on the NH2+ site close to Anth, the Pt(II) porphyrin moiety exhibited strong RTP emission, excited in the Anth band at 370 nm. This was due to the distance-dependent efficient singlet energy transfer between the Anth unit and the porphyrin moiety, followed by intersystem crossing from a singlet to a triplet state in Pt(II) porphyrin, while its RTP emission dramatically decreased when located on the Bpym2+ site far from the Anth unit. When excited in the porphyrin band at 402 nm, the RTP emission lifetimes changed obviously. This is the first rotaxane-type molecular shuttle whose shuttling has been encoded by RTP signals.

Room temperature phosphorescence of 4-bromo-1,8-naphthalic anhydride derivative-based polyacrylamide copolymer with photo-stimulated responsiveness

Co-reporter:Hui Chen, Lei Xu, Xiang Ma and He Tian

Polymer Chemistry 2016 vol. 7(Issue 24) pp:3989-3992

Publication Date(Web):17 May 2016

DOI:10.1039/C6PY00703A

Room temperature phosphorescence (RTP) emission was achieved by host–guest recognition between γ-cyclodextrin (γ-CD) and a 4-bromo-1,8-naphthalic anhydride (BrNpA) polymer (poly-BrNpA), which can be controlled by the photo-isomerization of the azobenzene (Azo) unit of the other polymer (poly-Azo) in aqueous solution.

Photoresponsive Supramolecular Assemblies Based on a C3-Symmetric Benzene-1,3,5-tricarboxamide-Anchored Diarylethene

Co-reporter:Teng Li;Xin Li;Jie Wang;Hans Ågren;He Tian

Advanced Optical Materials 2016 Volume 4( Issue 6) pp:840-847

Publication Date(Web):

DOI:10.1002/adom.201500694

Preparation and properties of organo-soluble tetraphenylethylene monolayer-protected gold nanorods

Co-reporter:Tiantian Cao, Dengfeng Li, Xuyang Yao, Yikai Xu, Xiang Ma

Dyes and Pigments 2016 Volume 124() pp:1-5

Publication Date(Web):January 2016

DOI:10.1016/j.dyepig.2015.08.028

•Tetraphenylethylene monolayer protected gold nanorod was successfully prepared.•Modification of gold nanorod was confirmed by UV–Vis, Raman and FT-IR spectra.•Gold nanorods quenched the aggregation-induced emission of tetraphenylethylene.Organo-soluble tetraphenylethylene derived monolayer-protected gold nanorods were prepared and characterized. The prepared gold nanorods covered with tetraphenylethylene thiol via the strong covalent Au–S linkage were found to be soluble and stable in organic solvents. The successful thiol exchange and modification of tetraphenylethylene derivative molecules on gold nanorods were confirmed from UV–Vis, Raman and FT-IR spectra. The gold nanorods were found to have a quenching effect on the aggregation-induced emission of the tetraphenylethylene thiol molecule modified on their surfaces.

Novel organogel harnessing Excited-State Intramolecular Proton Transfer process with aggregation induced emission and photochromism

Co-reporter:Miao Luo, Sheng Wang, Meiling Wang, Shaorong Huang, Chengpeng Li, Lin Chen, Xiang Ma

Dyes and Pigments 2016 Volume 132() pp:48-57

Publication Date(Web):September 2016

DOI:10.1016/j.dyepig.2016.04.036

•Two salicylideneanilines bearing with cholesterol were synthesized.•T1 and T2 showed aggregation-induced emission harnessing ESIPT process.•T2 could gelate in cyclohexane exhibiting enhanced emission both in gel and solid states.•T2 showed photochromic behavior both in gel and solid states under UV-light irradiation.Two novel aggregation-induced emission compounds harnessing Excited-State Intramolecular Proton Transfer process based on salicylideneaniline derived from tetraphenylethylene and cholesterol moieties were synthesized and characterized. One of the compounds could gelate in cyclohexane exhibiting gelation-induced enhanced emission and the emission intensities can be reversibly changed with the gel-solution transition by alternate cooling and heating. Moreover, this compound showed photochromic behavior both in gel and solid states under UV light irradiation due to the loose packing of the molecules and permitting the molecule to rotate, which may be a potential candidate for external stimuli-responsive materials through tuning the self-assembly process of the functional gelator.

Photo-responsive chiral cyclic molecular switches based on stiff stilbene

Co-reporter:Ning Zhu, Xin Li, Yuan Wang, Xiang Ma

Dyes and Pigments 2016 Volume 125() pp:259-265

Publication Date(Web):February 2016

DOI:10.1016/j.dyepig.2015.10.033

•Two novel photo-responsive chiral molecules based on stiff stilbene unit were fabricated.•The twist angle of binaphthyl was reversibly modulated under alternative UV light stimuli.•The length of alkyl chain influenced the twist angles of binaphthyl to some extent.Two novel photo-responsive chiral cyclic molecular switches constituted of stiff stilbene and binaphthyl moieties connected through alkyl chains of different length were fabricated. The cyclization synthetic strategy employed herein made it convenient to obtain the pure Z isomers rather than Z/E isomer mixtures. The detailed photo-switching behaviors of target compounds were studied by the UV–Vis absorption and circular dichroism spectra in dichloromethane. The twist angles of the binaphthyl of the switches were able to be reversibly modulated by Z/E isomerization of stiff stilbene unit under alternative UV light stimuli and influenced by the length of alkyl chain to some extent.

New π-conjugated cyanostilbene derivatives: Synthesis, characterization and aggregation-induced emission

Co-reporter:Fang Wang, Xue Li, Sheng Wang, Cheng-Peng Li, Huan Dong, Xiang Ma, Sung-Hoon Kim, De-Rong Cao

Chinese Chemical Letters 2016 Volume 27(Issue 10) pp:1592-1596

Publication Date(Web):October 2016

DOI:10.1016/j.cclet.2016.04.020

Two novel π-conjugated cyanostilbene derivatives, FLU-CNPH and TPE-CNPH, were designed and synthesized by introducing the strong electron donor 1, 4-dihydropyrro[3,2-b]indole and AIE electron donor tetraphenylethylene (TPE) to the (3′,5′-bis(trifluoromethyl)-biphenyl-4-yl)-acetonitrile, respectively. Both of them were fully characterized and their AIE behaviors were investigated using fluorescence spectroscopy and FE-SEM images. Their optimized structures and frontier molecular orbitals were calculated with the DFT by using Materials Studio 7.0 software to study the relationship between the structure and properties.Two novel π-conjugated cyanostilbene derivatives, FLU-CNPH and TPE-CNPH, were designed, synthesized, and fully characterized. Meanwhile, their aggregation-induced emission properties were also investigated in this article.

A Cucurbit[7]uril Based Molecular Shuttle Encoded by Visible Room-Temperature Phosphorescence

Co-reporter:Yifan Gong;Hui Chen; Xiang Ma; He Tian

ChemPhysChem 2016 Volume 17( Issue 12) pp:1934-1938

Publication Date(Web):

DOI:10.1002/cphc.201500901

Abstract

A visible room-temperature phosphorescence (RTP) signal, generated by complexation of cururbit[7]uril (CB[7]) and bromo-substituted isoquinoline in aqueous solution, is employed to address the shuttling of a pH-controlling molecular shuttle fabricated by CB[7] and a phosphor 6-bromoisoquinoline derivative IQC[5]. The CB[7] host shuttles along the axial guest under acidic conditions, accompanied by a weak RTP emission signal, while deprotonation of the guest IQC[5] makes the CB[7] wheel locate on the phosphor group, leading to intense RTP emission. The switching RTP emission of the molecular shuttle, via pH adjusting, can be visibly identified by the naked eye. This is the first CB-based molecular shuttle with an RTP signal as the output address of its shuttling and conformation.

A Hybrid Supramolecular Polymeric Hydrogel with Rapid Self-Healing Property

Co-reporter:Lin Chen;Hui Chen;Xuyang Yao; Xiang Ma; He Tian

Chemistry – An Asian Journal 2015 Volume 10( Issue 11) pp:2352-2355

Publication Date(Web):

DOI:10.1002/asia.201500704

Abstract

A hybrid supramolecular polymeric hydrogel is conveniently constructed via host–guest interaction of a host cyclodextrin polymer (poly-CD) with a guest α-bromonaphthalene polymer (poly-BrNp) and mixing with 6-thio-β-cyclodextrin (β-SH-CD) modified gold nanoparticles (GPCDs) in aqueous solution. According to the dynamic oscillatory data, the hydrogel exhibits markedly enhanced stiffness compared with the GPCD-free one (both G′ and G“ values are almost twice as high as those of the original GPCD-free hydrogel) due to the introduction of the inorganic gold nanoparticles. This hybrid supramolecular polymeric hydrogel has a rapid and excellent self-healing property (only about 1 min, and the G′ and G” of the self-healed hydrogel almost turned back to their original levels after 1 hour) in air (without adding any solvent or additive).

Cover Picture: A Hybrid Supramolecular Polymeric Hydrogel with Rapid Self-Healing Property (Chem. Asian J. 11/2015)

Co-reporter:Lin Chen;Hui Chen;Xuyang Yao; Xiang Ma; He Tian

Chemistry – An Asian Journal 2015 Volume 10( Issue 11) pp:

Publication Date(Web):

DOI:10.1002/asia.201500986

Aggregation-induced emission encoding supramolecular polymers based on controllable sulfonatocalixarene recognition in aqueous solution

Co-reporter:Xuyang Yao, Xiang Ma and He Tian

Journal of Materials Chemistry A 2014 vol. 2(Issue 26) pp:5155-5160

Publication Date(Web):15 Apr 2014

DOI:10.1039/C4TC00503A

A pH-responsive supramolecular polymer based on a homoditopic bis-p-sulfonatocalixarene host and a tetraphenylethylene derivative guest as building blocks with aggregation-induced emission (AIE) property is fabricated in aqueous solution. Quite different from usual supramolecular polymers constructed before, this novel supramolecular polymer has high luminescence efficiency rather than becoming low-luminescent after polymerization. Interestingly, the AIE signals are switchable between two alternative emission wavelengths in H2O or with ON and OFF switching in the mixing H2O–THF = 1:1 solution, which are realized by controllable and reversible supramolecular interactions. This strategy to design supramolecular polymers with switchable AIE property overcomes the common problem of aggregation-caused quenching (ACQ) in usual supramolecular polymers and provides a new concept to develop smart supramolecular polymeric materials.

INHIBIT logic operations based on light-driven β-cyclodextrin pseudo[1]rotaxane with room temperature phosphorescence addresses

Co-reporter:Jingjing Cao, Xiang Ma, Mingri Min, Tiantian Cao, Shuaifan Wu and He Tian

Chemical Communications 2014 vol. 50(Issue 24) pp:3224-3226

Publication Date(Web):04 Feb 2014

DOI:10.1039/C3CC49820D

INHIBIT logic gates based on light-driven β-cyclodextrin pseudo[1]rotaxane were conveniently fabricated in aqueous solution utilizing induced circular dichroism (ICD) and photocontrolled reversible room temperature phosphorescence (RTP) as output addresses respectively.

Multistate self-assembled micro-morphology transitions controlled by host–guest interactions

Co-reporter:Qiwei Zhang, Xuyang Yao, Da-Hui Qu and Xiang Ma

Chemical Communications 2014 vol. 50(Issue 13) pp:1567-1569

Publication Date(Web):03 Dec 2013

DOI:10.1039/C3CC48491B

The multistate micro-morphology of aggregates in aqueous solution can be manipulated by host–guest interactions between bis-sulfonatocalix[4]arene, γ-CD and a ditopic guest possessing viologen and coumarin moieties.

Photo-responsive spiropyran monolayer protected gold nanorod

Co-reporter:Jingjing Cao, Shuaifan Wu, Baoqi Zhai, Qiaochun Wang, Jing Li, Xiang Ma

Dyes and Pigments 2014 Volume 103() pp:89-94

Publication Date(Web):April 2014

DOI:10.1016/j.dyepig.2013.11.017

•Spiropyran monolayer protected gold nanorod (SGNR) was prepared for the first time.•SGNR was stable, soluble and photo-responsive under certain light irradiation in organic solvent.•The photochromism of spiropyran monolayer has effect on the SPR absorption of SGNR.The spiropyran monolayer covalently protected gold nanorod (GNR) hybrid was prepared and well characterized for the first time, which was stable, soluble and photo-responsive under certain light irradiation in organic solvent. The photochromism of the densely packed spiropyran monolayer on the surface of GNRs was found having effect on the surface plasmonic resonance (SPR) absorption of gold nanorods, namely inducing the intensity change of the two plasma absorption peaks at 786 and 551 nm of the GNR hybrids. The functionalization of this organic-inorganic GNR hybrid and the photo-tuning of its SPR absorption properties, especially in the not only UV–Vis range but also near-infrared (NIR) spectral area would make important and interesting sense in the area of functional hybrid nanomaterial.The spiropyran monolayer covalently protected gold nanorod (GNR) hybrid was prepared and well characterized for the first time, which was stable, soluble and photo-responsive under certain light irradiation in organic solvent. The photochromism of the densely packed spiropyran monolayer on the surface of GNRs was found having effect on the surface plasmonic resonance (SPR) absorption of gold nanorods, namely inducing the intensity change of the two plasma absorption peaks at 786 and 551 nm of the GNR hybrids. The functionalization of this organic-inorganic GNR hybrid and the photo-tuning of its SPR absorption properties, especially in the not only UV–Vis range but also near-infrared (NIR) spectral area would make important and interesting sense in the area of functional hybrid nanomaterial.

A Rapidly Self-Healing Supramolecular Polymer Hydrogel with Photostimulated Room-Temperature Phosphorescence Responsiveness

Co-reporter:Hui Chen; Xiang Ma;Dr. Shuaifan Wu ; He Tian

Angewandte Chemie 2014 Volume 126( Issue 51) pp:14373-14376

Publication Date(Web):

DOI:10.1002/ange.201407402

Abstract

Development of self-healing and photostimulated luminescent supramolecular polymeric materials is important for artificial soft materials. A supramolecular polymeric hydrogel is reported based on the host–guest recognition between a β-cyclodextrin (β-CD) host polymer (poly-β-CD) and an α-bromonaphthalene (α-BrNp) polymer (poly-BrNp) without any additional gelator, which can self-heal within only about one minute under ambient atmosphere without any additive. This supramolecular polymer system can be excited to engender room-temperature phosphorescence (RTP) signals based on the fact that the inclusion of β-CD macrocycle with α-BrNp moiety is able to induce RTP emission (CD-RTP). The RTP signal can be adjusted reversibly by competitive complexation of β-CD with azobenzene moiety under specific irradiation by introducing another azobenzene guest polymer (poly-Azo).

A Rapidly Self-Healing Supramolecular Polymer Hydrogel with Photostimulated Room-Temperature Phosphorescence Responsiveness

Co-reporter:Hui Chen; Xiang Ma;Dr. Shuaifan Wu ; He Tian

Angewandte Chemie International Edition 2014 Volume 53( Issue 51) pp:14149-14152

Publication Date(Web):

DOI:10.1002/anie.201407402

Abstract

Development of self-healing and photostimulated luminescent supramolecular polymeric materials is important for artificial soft materials. A supramolecular polymeric hydrogel is reported based on the host–guest recognition between a β-cyclodextrin (β-CD) host polymer (poly-β-CD) and an α-bromonaphthalene (α-BrNp) polymer (poly-BrNp) without any additional gelator, which can self-heal within only about one minute under ambient atmosphere without any additive. This supramolecular polymer system can be excited to engender room-temperature phosphorescence (RTP) signals based on the fact that the inclusion of β-CD macrocycle with α-BrNp moiety is able to induce RTP emission (CD-RTP). The RTP signal can be adjusted reversibly by competitive complexation of β-CD with azobenzene moiety under specific irradiation by introducing another azobenzene guest polymer (poly-Azo).

Sol–gel conversion based on photoswitching between noncovalently and covalently linked netlike supramolecular polymers

Co-reporter:Qiwei Zhang, Da-Hui Qu, Xiang Ma and He Tian

Chemical Communications 2013 vol. 49(Issue 84) pp:9800-9802

Publication Date(Web):23 Aug 2013

DOI:10.1039/C3CC46297H

Photo-control over supramolecular sol–gel conversion is achieved by incorporating photoactive coumarin moieties into a tribranched monomer and the self-assembly with γ-CD followed by noncovalent–covalent switchover.

Photo-responsive pseudo[n]rotaxanes based on disparate hetero-macrocycle host combination

Co-reporter:Ruyi Sun, Xiang Ma

Tetrahedron 2013 69(3) pp: 1069-1073

Publication Date(Web):

DOI:10.1016/j.tet.2012.11.066

Novel supramolecular CT polymer employing disparate pseudorotaxanes as relevant monomers

Co-reporter:Ruyi Sun, Qiwei Zhang, Qiaochun Wang, Xiang Ma

Polymer 2013 Volume 54(Issue 10) pp:2506-2510

Publication Date(Web):26 April 2013

DOI:10.1016/j.polymer.2013.03.030

A novel supramolecular polymer based on cucurbit [8] uril host-stabilized charge-transfer (CT) interactions between a viologen dication (MV2+) connector and a cyano-stilbene fluorophore decorated with dimethylamino portion has been constructed. Its reversible association and dissociation can be well controlled by electrochemical and pH stimuli, with two pseudorotaxanes worked as monomers induced by respective excitation. 1H NMR experiment, 2D NOESY NMR, DLS and AFM measurements were employed to demonstrate the formation of linear supramolecular polymer. Fluorescent and cyclic voltammetric experiments were carried out to illustrate its reversible assemble/disassemble process vividly.

Synthesis of ru(bpy)3-viologen and its complex included by p-sulfonatocalix[4]arene in a U-type binding manner

Co-reporter:Shuaifan Wu, Gang Wang, Lei Zou, Qiaochun Wang, Xiang Ma

Dyes and Pigments 2012 Volume 95(Issue 2) pp:436-442

Publication Date(Web):November 2012

DOI:10.1016/j.dyepig.2012.04.020

A novel Ru(bpy)3–viologen guest RPV and a reference compound PV are well designed and synthesized. Ru(bpy)3 based guest compound RPV prefers to form a novel U-type complex RPV⊂SC4 with p-sulfonatocalix[4]arene (SC4) host. Binding manner of the complex has been fully studied by 1H NMR, ESI-MS and 2D NOE NMR spectra. The 1:1 Binding ratio is confirmed by UV–Vis measurement and the association constant is determined by 1H NMR titration. In this host–guest system, both Ru(bpy)3 and viologen group show strong interactions with the host SC4. Due to the unique U-type structure of RPV⊂SC4, the competitive interactions between Ru(bpy)3 and viologen group were investigated as well.

Vinylbipyridinium dication–triphenylureidocalix[6]arene pseudorotaxane

Co-reporter:Shuai-Fan Wu, Xiang Ma

Tetrahedron Letters 2011 Volume 52(Issue 45) pp:5960-5962

Publication Date(Web):9 November 2011

DOI:10.1016/j.tetlet.2011.08.129

A novel pseudo[2]rotaxane 3⊂1 was constructed and confirmed by 1H NMR, UV–Vis absorption, and luminescence spectra. The association and fluorescence quenching abilities of the new complexes are limited because of their relatively weaker interactions than 2⊂1. Based on such a stable pseudorotaxane, a novel rotaxane employing 1-naphthoyl chloride as the stopper is also prepared.A novel pseudo[2]rotaxane 3⊂1 was constructed and confirmed by 1H NMR, UV–Vis absorption and luminescence spectra. The association and fluorescence quenching abilities of the new complexes are limited because of their relatively weaker interactions than 2⊂1. Based on such a stable pseudorotaxane, a novel rotaxane employing 1-naphthoyl chloride as the stopper is also prepared.

End-to-end assembly and disassembly of gold nanorods based on photo-responsive host–guest interaction

Co-reporter:Jie Wu, Yun Xu, Dengfeng Li, Xiang Ma and He Tian

Chemical Communications 2017 - vol. 53(Issue 33) pp:NaN4580-4580

Publication Date(Web):2017/03/30

DOI:10.1039/C7CC01678F

The host–guest interaction based on thiol-β-cyclodextrin and a symmetric compound containing two azobenzene units on ends has been utilized to form end-to-end assembly of gold nanorods. Both UV light irradiation and guest competition can be used to transform the GNR alignments in a disassembled manner.

Sol–gel conversion based on photoswitching between noncovalently and covalently linked netlike supramolecular polymers

Co-reporter:Qiwei Zhang, Da-Hui Qu, Xiang Ma and He Tian

Chemical Communications 2013 - vol. 49(Issue 84) pp:NaN9802-9802

Publication Date(Web):2013/08/23

DOI:10.1039/C3CC46297H

Photo-control over supramolecular sol–gel conversion is achieved by incorporating photoactive coumarin moieties into a tribranched monomer and the self-assembly with γ-CD followed by noncovalent–covalent switchover.

Aggregation-induced emission encoding supramolecular polymers based on controllable sulfonatocalixarene recognition in aqueous solution

Co-reporter:Xuyang Yao, Xiang Ma and He Tian

Journal of Materials Chemistry A 2014 - vol. 2(Issue 26) pp:NaN5160-5160

Publication Date(Web):2014/04/15

DOI:10.1039/C4TC00503A

A pH-responsive supramolecular polymer based on a homoditopic bis-p-sulfonatocalixarene host and a tetraphenylethylene derivative guest as building blocks with aggregation-induced emission (AIE) property is fabricated in aqueous solution. Quite different from usual supramolecular polymers constructed before, this novel supramolecular polymer has high luminescence efficiency rather than becoming low-luminescent after polymerization. Interestingly, the AIE signals are switchable between two alternative emission wavelengths in H2O or with ON and OFF switching in the mixing H2O–THF = 1:1 solution, which are realized by controllable and reversible supramolecular interactions. This strategy to design supramolecular polymers with switchable AIE property overcomes the common problem of aggregation-caused quenching (ACQ) in usual supramolecular polymers and provides a new concept to develop smart supramolecular polymeric materials.

Multistate self-assembled micro-morphology transitions controlled by host–guest interactions

Co-reporter:Qiwei Zhang, Xuyang Yao, Da-Hui Qu and Xiang Ma

Chemical Communications 2014 - vol. 50(Issue 13) pp:NaN1569-1569

Publication Date(Web):2013/12/03

DOI:10.1039/C3CC48491B

The multistate micro-morphology of aggregates in aqueous solution can be manipulated by host–guest interactions between bis-sulfonatocalix[4]arene, γ-CD and a ditopic guest possessing viologen and coumarin moieties.

INHIBIT logic operations based on light-driven β-cyclodextrin pseudo[1]rotaxane with room temperature phosphorescence addresses

Co-reporter:Jingjing Cao, Xiang Ma, Mingri Min, Tiantian Cao, Shuaifan Wu and He Tian

Chemical Communications 2014 - vol. 50(Issue 24) pp:NaN3226-3226

Publication Date(Web):2014/02/04

DOI:10.1039/C3CC49820D

INHIBIT logic gates based on light-driven β-cyclodextrin pseudo[1]rotaxane were conveniently fabricated in aqueous solution utilizing induced circular dichroism (ICD) and photocontrolled reversible room temperature phosphorescence (RTP) as output addresses respectively.

A room temperature phosphorescence encoding [2]rotaxane molecular shuttle

Co-reporter:Xiang Ma, Jing Zhang, Jingjing Cao, Xuyang Yao, Tiantian Cao, Yifan Gong, Chunchang Zhao and He Tian

Chemical Science (2010-Present) 2016 - vol. 7(Issue 7) pp:NaN4588-4588

Publication Date(Web):2016/03/29

DOI:10.1039/C6SC00769D

A novel bistable molecular shuttle, composed of a Pt(II) porphyrin-containing dibenzo[24]crown-8 macrocycle threaded onto two different recognition sites (secondary dialkylammonium (NH2+) and 4,4′-bipyridinium (Bpym2+) units), and the anthracene (Anth) moiety as one terminal stopper, was synthesized by click chemistry. Its acid–base switchable shuttling could be addressed by both the room temperature phosphorescence (RTP) emission signals of the Pt(II) porphyrin moiety and the fluorescence emission of the Anth unit, as well as their lifetime changes. When the macrocycle was switched to be located on the NH2+ site close to Anth, the Pt(II) porphyrin moiety exhibited strong RTP emission, excited in the Anth band at 370 nm. This was due to the distance-dependent efficient singlet energy transfer between the Anth unit and the porphyrin moiety, followed by intersystem crossing from a singlet to a triplet state in Pt(II) porphyrin, while its RTP emission dramatically decreased when located on the Bpym2+ site far from the Anth unit. When excited in the porphyrin band at 402 nm, the RTP emission lifetimes changed obviously. This is the first rotaxane-type molecular shuttle whose shuttling has been encoded by RTP signals.

A photochromic supramolecular polymer based on bis-p-sulfonatocalix[4]arene recognition in aqueous solution

Co-reporter:Xuyang Yao, Teng Li, Sheng Wang, Xiang Ma and He Tian

Chemical Communications 2014 - vol. 50(Issue 54) pp:NaN7168-7168

Publication Date(Web):2014/05/13

DOI:10.1039/C4CC02672A

A photochromic supramolecular polymer based on bis-p-sulfonatocalix[4]arene recognition with a dithienylethene derivative in aqueous solution was fabricated. The resultant polymer showed good photochromic behaviour with obvious colour switching and a morphology change under alternative UV/Vis light stimuli.

TOPICS

Abstract

Abstract

Abstract

Abstract