Co-reporter:Xiao-jun Kuang;Ali Wajahat;Wei-tao Gong;Manivannan Kalavathi Dhinakaran;Xiao-han Li;Gui-ling Ning
Soft Matter (2005-Present) 2017 vol. 13(Issue 22) pp:4074-4079
Publication Date(Web):2017/06/07
DOI:10.1039/C7SM00642J
A novel C3-symmetric benzene-1,3,5-tricarboxamide (BTAs) decorated with three identical pillar[5]arene tails was designed, synthesized and characterized. The compound can gelate acetonitrile at low concentration (0.2 wt%) upon sonication at room temperature, but a precipitate was obtained by a conventional heating–cooling process. Scanning electron microscopy revealed that the gel and precipitate were constructed by entangled, high-aspect-ratio flexible bundles of nanofibrils. UV-vis spectroscopy, circular dichroism, Fourier transform infrared microscopy and powder X-ray diffraction showed that the compound formed chiral, elongated, columnar aggregates with nanofiber morphology by a combination of intermolecular hydrogen bonding between the N–H and CO of amides, π–π stacking (H-aggregates) and hydrophobic interactions of peripheral groups.
Co-reporter:Le Fang, Yuanli Hu, Qiang Li, Shutao Xu, Manivannan Kalavathi Dhinakarank, Weitao Gong and Guiling Ning
Organic & Biomolecular Chemistry 2016 vol. 14(Issue 17) pp:4039-4045
Publication Date(Web):15 Mar 2016
DOI:10.1039/C6OB00064A
A novel AABB-type heteromultitopic monomer (APOPV), having a self-complementary perpendicular structure, could solely self-assemble to fluorescent cross-linked supramolecular polymers. Interestingly, the supramolecular gel film shows a sensitive fluorescence change on exposure to acid and base vapor, endowing this system with a potential application in gas detection.
Co-reporter:Xiaomin Qian;Dr. Weitao Gong;Dr. Xiaopeng Li;Le Fang;Xiaojun Kuang; Guiling Ning
Chemistry - A European Journal 2016 Volume 22( Issue 20) pp:6881-6890
Publication Date(Web):
DOI:10.1002/chem.201600561
Abstract
A new host molecule consists of four terpyridine groups as the binding sites with zinc(II) ion and a copillar[5]arene incorporated in the center as a spacer to interact with guest molecule was designed and synthesized. Due to the 120 ° angle of the rigid aromatic segment, a cross-linked dimeric hexagonal supramolecular polymer was therefore generated as the result of the orthogonal self-assembly of metal–ligand coordination and host–guest interaction. UV/Vis spectroscopy, 1H NMR spectroscopy, viscosity and dynamic light-scattering techniques were employed to characterize and understand the cross-linking process with the introduction of zinc(II) ion and guest molecule. More importantly, well-defined morphology of the self-assembled supramolecular structure can be tuned by altering the adding sequence of the two components, that is, the zinc(II) ion and the guest molecule. In addition, introduction of a competitive ligand suggested the dynamic nature of the supramolecular structure.
Co-reporter:Le Fang;Wei-Tao Gong;Manivannan Kalavathi Dhinakaran;Li Shang
Chemical Papers 2016 Volume 70( Issue 5) pp:663-666
Publication Date(Web):2016 May
DOI:10.1515/chempap-2015-0241
A novel Hg2+ ion induced reversible ring contraction was achieved employing the intramolecular reaction of isobutylene with an aromatic hydroxyl group of cyclophane; reversibility of the reaction was facilitated by excess addition of NaBH4 which also resulted in complexation. The ring contraction and expansion was monitored by UV-VIS absorption, and by fluorescence and 1H NMR spectra. Switchable fluorescence behavior (on—off—on) was observed when the ring-size was tuned from a 19-membered ring to an 18-membered and vice versa. This fine tuning has the potential to be applied in the construction of new supramolecular devices.
Co-reporter:Yang Zhang, Weitao Gong, Jingjie Yu, Yuan Lin and Guiling Ning
RSC Advances 2015 vol. 5(Issue 117) pp:96272-96280
Publication Date(Web):28 Oct 2015
DOI:10.1039/C5RA19345A
A series of novel single-phase color tunable LiGd(WO4)2(LGW):Re3+ (Re = Tm, Tb, Dy, Eu) phosphors have been synthesized by a solid-state reaction. X-ray diffraction (XRD), FT-IR, photoluminescence (PL) and fluorescence decay curves were utilized to characterize the as-prepared samples. Under the excitation of UV light, LGW:Tm3+, LGW:Tb3+, LGW:Dy3+ and LGW:Eu3+ exhibit the characteristic emissions of Tm3+ (blue), Tb3+ (green), Dy3+ (yellow) and Eu3+ (red), respectively. On the one hand, by simply adjusting the doping concentration of Eu3+ ions in the LGW:2% Tm3+, 4% Tb3+, x% Eu3+ system, a white emission in a single-phase was achieved by blending simultaneously the blue, green, and red emissions of Tm3+, Tb3+, and Eu3+ ions in the LGW host, in which the energy transfer from Tb3+ to Eu3+ ions was found to play an important role. On the other hand, a white emission can also be realized based on the energy transfer from Tm3+ to Dy3+ ions in the LGW:2% Tm3+, x% Dy3+ system. The energy transfer mechanism from Tm3+ to Dy3+ ions has been demonstrated to be through dipole–quadrupole interaction and the critical distance (RTm–Dy) calculated by the concentration quenching method is 16.03 Å. The PL properties of as-prepared materials indicate that LGW:Re3+ (Re = Tm, Tb, Dy, Eu) may be potentially applied as single-phase white-light-emitting phosphors for UV-excited WLEDs.
Co-reporter:Weitao Gong, Peng Gao, Gang Li, Hassan Mehdi, Guiling Ning and Jingjie Yu
RSC Advances 2014 vol. 4(Issue 93) pp:51268-51271
Publication Date(Web):08 Oct 2014
DOI:10.1039/C4RA08954E
A novel methodology was discovered to construct multi-phenyl substituted pyrido-fused benzimidazole (PBI) core frameworks via direct oxidative intramolecular C–H amination of α-unsubstituted pyridinium salts under transition-metal free conditions. The resulting highly π-conjugated PBI derivatives exhibited highly tunable fluorescent emission not only in solution but also in the solid state.
Co-reporter:Wen-dan Chen, Wei-tao Gong, Zhi-qiang Ye, Yuan Lin and Gui-ling Ning
Dalton Transactions 2013 vol. 42(Issue 28) pp:10093-10096
Publication Date(Web):09 May 2013
DOI:10.1039/C3DT50832C
Efficient ratiometric fluorescent Fe3+ probes were designed and synthesized by linking a conjugated naphthalene chromophore to a rhodamine platform and a lipophilic triphenylphosphonium (TPP) cation. The probes could sensitively and selectively detect mitochondrial Fe3+ in living cells.
Co-reporter:Wei-Tao Gong;Xiao-min Qian;Fu-Rui Wang;Yuan Lin ;Gui-Ling Ning
Heteroatom Chemistry 2013 Volume 24( Issue 1) pp:66-71
Publication Date(Web):
DOI:10.1002/hc.21064
ABSTRACT
New highly conjugated bispyryliums were synthesized by the Knoevenagel reaction between α-CH3 pyrylium and aromatic dicarboxaldehydes. Their photophysical properties were fully investigated. The results showed that they exhibited a tunable fluorescence emission colors ranging from green to red in solution by changing the properties of connecting π bridges. The experimental results were also supported by theoretical calculations. In addition, their fluorescence emission in solid state was also investigated preliminarily. © 2012 Wiley Periodicals, Inc. Heteroatom Chem 24:66–71, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/hc.21064
Co-reporter:Wei-Tao Gong, Qing-Lan Zhang, Li Shang, Bei Gao, Gui-Ling Ning
Sensors and Actuators B: Chemical 2013 177() pp: 322-326
Publication Date(Web):
DOI:10.1016/j.snb.2012.11.009
Co-reporter:Wen-dan Chen, Da-wei Zhang, Wei-tao Gong, Yuan Lin, Gui-ling Ning
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2013 110() pp: 471-473
Publication Date(Web):
DOI:10.1016/j.saa.2013.03.088
Co-reporter:Weitao Gong, Qinglan Zhang, Furui Wang, Bei Gao, Yuan Lin and Guiling Ning
Organic & Biomolecular Chemistry 2012 vol. 10(Issue 37) pp:7578-7583
Publication Date(Web):30 Jul 2012
DOI:10.1039/C2OB26135A
Synthesis of a simple amidopyridinium-based sensor (F1) and its fluorescence behavior toward H2PO4− (Pi) were investigated. The anthryl group in F1 exhibited a strong excimer emission via Pi-directed assembly of F1; other anions showed a negligible effect. The Pi-induced assembly of F1 was rationalized by photophysical experiments and DFT calculation.
Co-reporter:Wendan Chen, Weitao Gong, Junwei Ye, Yuan Lin and Guiling Ning
RSC Advances 2012 vol. 2(Issue 3) pp:809-811
Publication Date(Web):05 Dec 2011
DOI:10.1039/C1RA00722J
A new low molecular-weight gelator G1 having hydrozone and azobenzene groups was designed and synthesized. The corresponding organogel from G1 exhibited multistimuli responsive capability by tuning the hydrogen-bonding and amphiphilic properties.
Co-reporter:Bei Gao, Wei-Tao Gong, Qing-Lan Zhang, Jun-Wei Ye, Gui-Ling Ning
Sensors and Actuators B: Chemical 2012 Volume 162(Issue 1) pp:391-395
Publication Date(Web):20 February 2012
DOI:10.1016/j.snb.2011.12.060
A simple 7-hydroxycoumarin-based compound L1 was rationally designed and synthesized behaving as a highly selective fluorescent sensor for Hg2+ in aqueous media. It shows selective and “turn-on” fluorescence upon addition of Hg2+. Fluorescence titration and 1H NMR investigation reveal that the fluorescence enhancement of L1 upon Hg2+ addition is promoted by Hg2+-induced cyclization of L1 to a more rigid dihydrobenzofuran derivative.
Co-reporter:Wei-tao Gong, Shuang Bao, Fu-rui Wang, Jun-wei Ye, Gui-ling Ning, Kazuhisa Hiratani
Tetrahedron Letters 2011 Volume 52(Issue 5) pp:630-634
Publication Date(Web):2 February 2011
DOI:10.1016/j.tetlet.2010.11.147
A novel fluorescent sensor L1 exhibiting selective H2PO4- sensing ability was synthesized. The initial conformation of L1 was controlled via intramolecular hydrogen bonding and the switching/gating function was achieved by disturbing the intramolecular hydrogen bonds before and after interaction with H2PO4-.
Co-reporter:Gang Li, Wei-Tao Gong, Jun-Wei Ye, Yuan Lin, Gui-Ling Ning
Tetrahedron Letters 2011 Volume 52(Issue 12) pp:1313-1316
Publication Date(Web):23 March 2011
DOI:10.1016/j.tetlet.2011.01.057
Pyridinium 1a underwent an efficient intramolecular cyclization initiated by fluoride ions to form highly fluorescent 1,3,4-triphenylpyrido[1,2-a]benzimidazole, providing a novel chemodosimeter for fluoride ions detection.Pyridinium 1a underwent an efficient intramolecular cyclization initiated by fluoride ion to form highly fluorescent 1,3,4-triphenylpyrido[1,2-a]benzimidazole, providing a novel chemodosimeter for fluoride ion detection.
Co-reporter:Shuang Bao;Wei-tao Gong;Wen-dan Chen
Journal of Inclusion Phenomena and Macrocyclic Chemistry 2011 Volume 70( Issue 1-2) pp:115-119
Publication Date(Web):2011 June
DOI:10.1007/s10847-010-9869-2
A new tripodal receptor for anion sensing based on amide-pyridinium as recognition site and nitro-benzene as signaling unit was designed and successfully synthesized. This receptor showed high selectivity and strong binding affinity toward AcO− over the investigated anions, especially over H2PO4−. Addition of AcO− induced clear color change of solution from colorless to yellow, realizing the “naked-eye” detection. UV–Vis and 1H NMR experiments indicated the selectivity might origin from the synergistic effects arising from hydrogen bonding, electrostatic interactions and conformational change.
Co-reporter:Tao Xu, Wei-tao Gong, Jun-wei Ye, Yuan Lin, and Gui-ling Ning
Organometallics 2010 Volume 29(Issue 24) pp:6744-6748
Publication Date(Web):November 19, 2010
DOI:10.1021/om100872f
The ring transformation of the α-reactive 2,4,5-triphenylpyrylium salt 1 with η3-phosphines to the aryl- and alkylphosphonium triphenylcyclopentadienylides 5 is reported. The mechanism of this unprecedented transformation might involve tandem conjugate addition and intramolecular Wittig cyclization.
Co-reporter:Weitao Gong, Qinglan Zhang, Furui Wang, Bei Gao, Yuan Lin and Guiling Ning
Organic & Biomolecular Chemistry 2012 - vol. 10(Issue 37) pp:NaN7583-7583
Publication Date(Web):2012/07/30
DOI:10.1039/C2OB26135A
Synthesis of a simple amidopyridinium-based sensor (F1) and its fluorescence behavior toward H2PO4− (Pi) were investigated. The anthryl group in F1 exhibited a strong excimer emission via Pi-directed assembly of F1; other anions showed a negligible effect. The Pi-induced assembly of F1 was rationalized by photophysical experiments and DFT calculation.
Co-reporter:Wen-dan Chen, Wei-tao Gong, Zhi-qiang Ye, Yuan Lin and Gui-ling Ning
Dalton Transactions 2013 - vol. 42(Issue 28) pp:NaN10096-10096
Publication Date(Web):2013/05/09
DOI:10.1039/C3DT50832C
Efficient ratiometric fluorescent Fe3+ probes were designed and synthesized by linking a conjugated naphthalene chromophore to a rhodamine platform and a lipophilic triphenylphosphonium (TPP) cation. The probes could sensitively and selectively detect mitochondrial Fe3+ in living cells.
Co-reporter:Le Fang, Yuanli Hu, Qiang Li, Shutao Xu, Manivannan Kalavathi Dhinakarank, Weitao Gong and Guiling Ning
Organic & Biomolecular Chemistry 2016 - vol. 14(Issue 17) pp:NaN4045-4045
Publication Date(Web):2016/03/15
DOI:10.1039/C6OB00064A
A novel AABB-type heteromultitopic monomer (APOPV), having a self-complementary perpendicular structure, could solely self-assemble to fluorescent cross-linked supramolecular polymers. Interestingly, the supramolecular gel film shows a sensitive fluorescence change on exposure to acid and base vapor, endowing this system with a potential application in gas detection.
![PYRIDO[1,2-A]BENZIMIDAZOLE, 1-[1,1'-BIPHENYL]-4-YL-3,4-DIPHENYL-](http://img.cochemist.com/ccimg/645500/645401-18-9.png)
![PYRIDO[1,2-A]BENZIMIDAZOLE, 1-[1,1'-BIPHENYL]-4-YL-3,4-DIPHENYL-](http://img.cochemist.com/ccimg/645500/645401-18-9_b.png)
![PYRIDO[1,2-A]BENZIMIDAZOLE, 1,3,4-TRIPHENYL-](http://img.cochemist.com/ccimg/406200/406193-26-8.png)
![PYRIDO[1,2-A]BENZIMIDAZOLE, 1,3,4-TRIPHENYL-](http://img.cochemist.com/ccimg/406200/406193-26-8_b.png)
