Co-reporter:Changlin Zhao, Zhiqiang Wang, Xueqing Gong, Qisong Zhang, Chengyun Wang, Yongjia Shen
Dyes and Pigments 2017 Volume 140(Volume 140) pp:
Publication Date(Web):1 May 2017
DOI:10.1016/j.dyepig.2017.01.065
•A dyad composed of a spiropyran unit and a naphthalimide unit was synthesized.•The FRET effect and inhibition of PET effect were achieved as expected.•The dyad was applied to mimick the Three State Logic (TSL) circuit successfully.A new dyad composed of a naphthalimide unit and a spiropyran unit with a piperazine unit as the bridge has been synthesized to mimick the Three State Logic (TSL) gate and the luminescence was recorded as the output. Inputs including Protonation, deprotonation, UV irradiation and Fe3+ coordination were employed to modulate the emission because of their distinctive outputs. Transient fluorescence and theoretical calculation were performed to further investigate the PET and FRET processes.An optimized dyad composed of spiropyran and naphthalimide bridging with piperazine was synthesized and tested for molecular logic gate mimicking Three State Logic (TSL) gate. Because its distinctive responses to UV irradiation, trifluoroacetic acid (TFA) and trimethylamine (TEA) titration and Fe3+ coordination.Download high-res image (136KB)Download full-size image
Co-reporter:Qisong Zhang, Yuhao Li, Hujin Zuo, Chengyun Wang, Yongjia Shen
Journal of Photochemistry and Photobiology A: Chemistry 2017 Volume 332() pp:293-298
Publication Date(Web):1 January 2017
DOI:10.1016/j.jphotochem.2016.09.007
•A new chromophore (not traditional), which can be easily modified, with a donor-acceptor-donor (D-A-D) molecular configuration and containing a dithioacetal group served as a sensing unit.•It is advantage to be a colorimetric and ratiometric dual channel chemosensor.•High stokes shift about 160 nm, and the fluorescence is 650 nm, which is near infrared.•High selectivity and competivity towards K+, Na+, Ag+, Fe2+, Co2+, Mn2+, Zn2+, Ca2+, Pb2+, Ni2+, Mg2+, Cu2+, Al3+ and Fe3+.A new near-infrared colorimetric and ratiometric fluorescent chemodosimeter for Hg2+ detection was devised, with a donor-acceptor-donor (D-A-D) molecular configuration and containing a dithioacetal group served as a sensing unit, and with a large stokes shift over 160 nm. The oxidation reaction of Hg2+ broke the electron-donating interaction of dithioacetal moiety, and the obstruction in the intramolecular charge transfer (ICT) induced remarkable changes in the absorption and emission spectra. The sensor exhibited splendid selectivity and anti-interference performance towards Hg2+ over other cations (K+, Na+, Ag+, Fe2+, Co2+, Mn2+, Zn2+, Ca2+, Pb2+, Ni2+, Mg2+, Cu2+, Al3+, Fe3+). The mechanism was investigated by absorption and emission spectra together with 1H NMR titration.
Co-reporter:Qisong Zhang, Jian Zhang, Hujin Zuo, Chengyun Wang, Yongjia Shen
Tetrahedron 2017 Volume 73, Issue 19(Issue 19) pp:
Publication Date(Web):11 May 2017
DOI:10.1016/j.tet.2017.03.088
A novel near infrared ratiometric fluorescent chemosensor based on triphenylamine, thiophene and benzothiadiazole has been developed. The emission wavelength of sensor DTPAT-BT-S was in the near infrared region. The wavelength changed from 656 nm to 723 nm, and got a rather long stokes shift about 170 nm. The sensor showed a very high selectivity towards Hg2+ ions.A colorimetric and ratiometric sensor has been fabricated.Download high-res image (194KB)Download full-size image
Co-reporter:Jiefei Wu, Guoqiao Lai, Zhifang Li, Yunxiang Lu, Taohua Leng, Yongjia Shen, Chengyun Wang
Dyes and Pigments 2016 Volume 124() pp:268-276
Publication Date(Web):January 2016
DOI:10.1016/j.dyepig.2015.09.021
•Novel sensors possessed fast response and high selectivity for fluoride ion.•Theoretical calculations were used to identify differences of two fluoride sensors.•Detected mechanism is inhibiting excited-state intramolecular proton transfer.Two novel 2,1,3-benzothiadiazole derivatives, used as colorimetric and fluorescent sensors for fluoride ion were designed, synthesized and characterized. These sensors contained single hydrogen-bond functional groups, which acted as interacting sites for fluoride ion. Both sensors displayed a red color in dimethyl sulfoxide solution. Binding studies revealed that they showed noticeable colorimetric and fluorescent responses only to F− among the eight anions tested (F−, Cl−, Br−, I−, AcO−, H2PO4−, HSO4− and NO3−). 1H NMR titration proved that the interaction between compounds and fluoride ion: hydrogen bond at low fluoride ion concentration, deprotonation at high fluoride ion concentration. Moreover, those compounds showed high sensitivity and selectivity for fluoride ion by inhibiting the excited state intramolecular proton transfer processes, and the detective processes could be followed by direct visual observation.Two novel 2,1,3-benzothiadiazole derivatives as reactive fluorescent sensors with high sensitivity and selectivity for fluoride ion have been fabricated.
Co-reporter:Yuwen Ma, Taohua Leng, Guoqiao Lai, Zhifang Li, Xiaojia Xu, Jianwei Zou, Yongjia Shen, Chengyun Wang
Tetrahedron 2016 Volume 72(Issue 17) pp:2219-2225
Publication Date(Web):28 April 2016
DOI:10.1016/j.tet.2016.03.029
A novel turn-off probe for copper(II) containing benzo[1,2-b:4,5-b′]dithiophene (BDT) and two picolinamide units was synthesized. In this probe, two picolinamide units complex with one Cu2+ ion and two nitrogen atoms in each picolinamide unit coordinate with Cu2+, which is verified by DFT calculation. Its fluorescence quantum yield is 0.43 and the detection limit is as low as 2.4×10−8 mol/L. The results show that the probe displays good selectivity for Cu2+ over other ions (Mn2+, Pb2+, Cr3+, Zn2+, Ni2+, K+, Ca2+, Ag+, Mg2+, Fe3+, Fe2+, Hg2+, Al3+, Cd2+, Pd2+, Co2+). Furthermore, the probe induced by Cu2+ and the π–π interaction of the aromatic unit can also form rod structure assembly, which can be observed by scanning electron microscopy (SEM).A benzo[1,2-b:4,5-b′]dithiophene (BDT) unit-based probe with high selectivity for copper(II) has been fabricated.
Co-reporter:Qisong Zhang, Jian Zhang, Hujin Zuo, Chengyun Wang, Yongjia Shen
Tetrahedron 2016 Volume 72(Issue 9) pp:1244-1248
Publication Date(Web):3 March 2016
DOI:10.1016/j.tet.2016.01.019
A chemical sensor containing triphenylamine and benzothiadiazole for cyanide anions detection was designed and synthesized, whose structural feature is a donor-acceptor-donor (D-A-D) molecular configuration, which is substituted with a dicyanovinyl group served as a sensing unit. The nucleophilic addition of cyanide ion to the dicyanovinyl moiety was activated in the principle of Michael addition, which broken the electron-withdrawing interaction of dicyanovinyl moiety. The obstruction in the intramolecular charge transfer (ICT) induced remarkable changes in the absorption and emission spectra. The sensor exhibited splendid selectivity and anti-interference performance towards CN− over other anions (F−, Cl−, Br−, I−, NO2−, NO3−, HCO3−, H2PO4−, HS−, HSO3−, NCO−, SCN−, SO32−, SO42−, HPO42−, CO32−). The mechanism was investigated by absorption and emission spectra together with 1H NMR titration.A colorimetric and fluorescent sensor has been fabricated.
Co-reporter:Rui Huang;Hujin Zuo;Lei Zhang;Chengyun Wang;Yongjia Shen
Polymer Bulletin 2015 Volume 72( Issue 10) pp:2527-2536
Publication Date(Web):2015 October
DOI:10.1007/s00289-015-1418-0
Two copolymers (P1 and P2), bearing 3,4-ethylenedioxythiophene and fluorene moieties, were synthesized via Sonogashira coupling reaction successfully and P2 contains additional tetrathiafulvalene derivatives (TTFs) as pendants. The structures and properties of copolymer P1 and P2 were investigated by Infrared spectra, UV–visible spectra, and fluorescence spectra. Spectra analyses revealed that the fluorescent intensity of P2 was only 2 % compared to that of P1 in solution. The quenched fluorescent intensity of P2 could be recovered after adding defined moles of Fe(ClO4)3 as an oxidant. The phenomenon was discussed with aid of computational stimulation in Gaussian 03. Herein, it is believed that intramolecular charge transfer occurs between TTF pendants and polymeric backbone in P2. P2 could be treated as a reporting group in fluorescent testing/switching system.
Co-reporter:Kai Wang, Guoqiao Lai, Zhifang Li, Mengmeng Liu, Yongjia Shen, Chengyun Wang
Tetrahedron 2015 Volume 71(Issue 41) pp:7874-7878
Publication Date(Web):14 October 2015
DOI:10.1016/j.tet.2015.08.021
In view of palladium contaminants and their adverse effects on human health, it is valuable to develop an effective probe for palladium. In this work, a coumarin-based colorimetric and turn-on fluorescent probe, Cou-1, for highly selective and sensitive detection of palladium was designed based on the Tsuji–Trost allylic reaction. Upon the addition of palladium to the solution of probe, the probe gave an emission peak at around 498 nm as well as displayed a selective chromogenic behavior toward palladium from colorless to yellow-green, which could be easily observed by the naked eye. Moreover, compared with typical transition metal cations and other common cations used, Cou-1 showed great selectivity toward palladium. Further, the detection limit toward palladium was calculated to be as low as 17.4 nM.A coumarin-based colorimetric and turn-on fluorescent probe, for highly selective and sensitive detection of palladium was designed based on the Tsuji–Trost allylic reaction. The detection limit toward palladium is calculated to be as low as 17.4 nM.
Co-reporter:Yuwen Ma, Guoqiao Lai, Zhifang Li, Wenbin Tan, Yongjia Shen, Chengyun Wang
Tetrahedron 2015 Volume 71(Issue 46) pp:8717-8724
Publication Date(Web):18 November 2015
DOI:10.1016/j.tet.2015.09.059
Two novel donor-π-acceptor chemosensors, exTTF-DPA and exTTF-ADPA, based on π-extended tetrathiafulvalene (exTTF) and di(pyridine-2-ylmethyl)amine (DPA) were synthesized and used as optical and electrochemical chemosensors for copper(II). The results showed that they possess specific selectivity for copper(II) in the presence of other competing metal ions (Zn2+, Sn2+, Pb2+, Pd2+, Hg2+, Al3+, Fe3+, Ag+, Co2+, Ni2+) in acetonitrile. Upon the addition of Cu2+, the solution color changed from yellow to orange, the cyclic voltammograms changed dramatically and the fluorescence quenched completely.Two exTTF-based optical and electrochemical sensors for selective and sensitive detection of copper(II) were prepared. Their solution color changed obviously from yellow to orange and cyclic voltammograms changed dramatically.
Co-reporter:Yingyi Wang, Guoqiao Lai, Zhifang Li, Yuwen Ma, Yongjia Shen, Chengyun Wang
Tetrahedron 2015 Volume 71(Issue 18) pp:2761-2767
Publication Date(Web):6 May 2015
DOI:10.1016/j.tet.2015.03.003
A series of new A–π–D–π–A molecules including diphenylamine and carbazole had been synthesized and characterized (T1–T3). T1 and T2 displayed aggregation-induced emission enhancement (AIEE): exhibiting weak fluorescence in pure THF, which a signification AIEE effect was observed in mixture with a water fraction (fw) of 90% with a sharp increase in fluorescence intensity. T3 displayed aggregation-caused quenching (ACQ): exhibiting strong fluorescence in pure THF, which a signification ACQ effect was observed in mixture with a water fraction (fw) of 90% with a sharp decrease in fluorescence intensity. Their two-photon absorption (2PA) had been investigated using the open-aperture Z-scan technique, and the values of the 2PA cross section at 800 nm for T1–T3 were 1115, 681, in chloroform, respectively.Three new A–π–D–π–A molecules had been synthesized and characterized (T1–T3). The 2PA cross section at 800 nm for T1–T3 were 1115, 681, 434 GM, respectively.
Co-reporter:Lei Zhang;Changzhi Wu;Chengyun Wang;Hujin Zuo ;Yongjia Shen
Journal of Heterocyclic Chemistry 2014 Volume 51( Issue 5) pp:1277-1281
Publication Date(Web):
DOI:10.1002/jhet.1834
3,4-(Hydroxymethyl-ethylenedioxy)thiophene (4) and 3,4-(2′-hydroxypropylenedioxy)thiophene (4'′) were synthesized from dimethyl 3,4-dihydroxythiophene-2,5-dicarboxylate (1), which were isomers and difficult to separate. When they were esterified with tetrathiafulvalene carried carboxylic acid group, only 3,4-(hydroxymethyl-ethylenedioxy)thiophene (4) could be esterified. No such selectivity was observed when the isomers were esterified by lauric acid and benzoic acid, respectively.
Co-reporter:Lei Zhang;Meijiang Li;Chengyun Wang;Yanhong Wang;Yongjia Shen
Journal of Applied Polymer Science 2013 Volume 127( Issue 5) pp:3356-3364
Publication Date(Web):
DOI:10.1002/app.37803
Abstract
Three 3,4-ethylenedioxythiophene (EDOT) derivatives, including an EDOT-tetrathiafulvalene (TTF) derivative, were synthesized by Steglich esterification of carboxylic acids with hydroxymethyl EDOT (3,4-ethylenedioxythiophene methanol). The UV spectra showed that there was no distinctive intramolecular interaction for the EDOT–TTF monomer between the EDOT and the TTF moieties in the ground state; however, the cyclic voltammetry responses implied that such intramolecular interaction occurred. Electropolymerization in excessive potential could bring in strong overoxidation effects and degradation in the polymer film. The polymers were simulated using density functional theory with Gaussian03 package and the optimized HOMO and LUMO state were figured out. The conductivity of TTF-polymer was 6 S·cm−1 obtained by galvano station and 4.8 × 10−3 S·cm−1 obtained by potentiostatic electropolymerization after doping with 7,7,8,8-tetracyanoquinodimethane. The results indicated that this polymer was a reasonable candidate for conducting materials and it was meaningful to increase the conductive dimensions of TTF polymers by chemical doping. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Co-reporter:Xue-Chao Zhang;Cheng-Yun Wang;Guo-Qiao Lai;Lei Zhang
Polymer Bulletin 2011 Volume 66( Issue 7) pp:893-903
Publication Date(Web):2011 April
DOI:10.1007/s00289-010-0322-x
Three conjugated ethynylene-carbazole polymers with Tetrathiafulvalene (TTF) as pendant group (P1–P3) were synthesized by using sonogashira coupling reaction and characterized by 1H NMR, GPC, CV, UV–Vis, FL, and TGA. CV and UV–Vis spectra showed that an intramoleular interaction existed between the electron-rich moiety TTF and electron-deficient moiety polyethynylcarbazole of the polymers. A strong fluorescence quench (ca. 99%) could be observed, compared to the polyethynylene-carbazole without TTF units, which could be ascribed to the photo-induced electron transfer (PET) interaction from TTF moiety to the polyethynylene-carbazole backbone. The observed onset decomposition temperatures (Td) for P1–P3 varied from 256 to 298 °C. The polymers mentioned above exhibited good thermal properties and higher conductivity (neutral conductivity ~7–11 × 10−7 S cm−1; doped conductivity ~6–11 × 10−4 S cm−1).
Co-reporter:Meijiang Li;Rui Huang;Changzhi Wu
Frontiers of Chemical Science and Engineering 2011 Volume 5( Issue 4) pp:422-428
Publication Date(Web):2011 December
DOI:10.1007/s11705-011-1124-x
Two donor-σ-acceptor molecular systems incorporating tetrathiafulvalene (TTF) and tetraphenylporphyrin (TPP) units, TTF-TPP (dyad 1) and TTF-TPP-TTF (triad 2), were synthesized. Both dyad 1 and triad 2 and their synthetic intermediates have been characterized by 1H nuclear magnetic resonance (1H NMR) and mass spectrography (MS). Their ultraviolet and visible spectroscopy (UV-Vis) and cyclic voltammetry (CV) showed negligible intramolecular charge transfer interaction in their ground states. Their fluorescence intensity was strongly quenched compared with TPP, which implied the photoinduced electron transfer occurred from the TTF unit to the TPP unit in the excited state. On the other hand, their fluorescence intensity could be modulated by sequential oxidation of the TTF unit using chemical methods, which exhibited their potential application in fluorescence molecular switch.
Co-reporter:Xuechao Zhang, Chengyun Wang, Guoqiao Lai, Lei Zhang and Yongjia Shen
New Journal of Chemistry 2010 vol. 34(Issue 2) pp:318-324
Publication Date(Web):08 Dec 2009
DOI:10.1039/B9NJ00520J
A series of conjugated ethynylene-fluorene polymers with electro-donating TTF as pendant groups (P2–P4) were synthesized by using Sonogashira coupling reaction, and two functionalization methods, i.e. prepolymerization and postpolymerization, were developed. The composition and purity of the corresponding products were analyzed by 1H NMR. The results proved the functionalization of P2 (pre) and P2 (post) were 40% and 100%, respectively. The results also indicated that the postpolymerization method would be a better approach to prepare TTF-pendant conjugated ethynylene-fluorene polymers. The postpolymerization methodology could be extended to synthesize other conjugated fluorene-based polymers bearing TTF units (P3 and P4). The polymers mentioned above exhibited good solubility in normal organic solvents and higher conductivity (neutral conductivity ∼2–4 × 10−6 S cm−1; doped conductivity ∼1–3 × 10−3 S cm−1). Moreover, the fluorescence intensity of P2 (post) could be modulated by the oxidation of TTF units, which makes it an attractive candidate for the fluorescence switch.
Co-reporter:Ting WU;Man GAO;Bo YE;Yongjia SHEN
Chinese Journal of Chemistry 2009 Volume 27( Issue 5) pp:983-986
Publication Date(Web):
DOI:10.1002/cjoc.200990167
Abstract
(S)-3-Carbamoylmethyl-5-methylhexanoic acid was heated in xylene and converted into 4-isobutyl-piperidine- 2,6-dione, which was hydrolyzed in aqueous solution of sodium hydroxide to afford the racemate. Our process is much advantageous over the traditional one, with not only less time (ca. 20 h) but also higher yield (76.4%).
Co-reporter:Guoqiao Lai;Yibo Liu;Meijiang Li
Frontiers of Chemical Science and Engineering 2009 Volume 3( Issue 2) pp:192-195
Publication Date(Web):2009 June
DOI:10.1007/s11705-009-0015-x
Two donor-σ-acceptor molecules containing tetrathiafulvalene (TTF) and carbazole moieties were synthesized by the reaction of 9-(4-bromo-butyl)-carbazole (1) with 2,6-bis(hexylthio)-3-(2-cyanoethylthio)-7- (methylthio)-tetrathiafulvalene (2) or 2,6-bis(2-cyanoethylthio)-3, 7-bis(methylthio)tetrathiafulvalene (3) in the presence of CsOH·H2O, respectively. The structures of the molecules were characterized by 1H NMR, 13C NMR, MS, and elemental analyses. They showed negligible intramolecular charge-transfer interaction in their ground states as indicated by their UV-Vis spectroscopics and cyclic voltammetry results. Compared with carbazole, their fluorescence was strongly quenched, which implied that a photo induced electron transfer (PET) interaction between TTF and carbazole moieties occurred.
Co-reporter:Xue-Chao Zhang;Yu Zhang;Cheng-Yun Wang;Guo-Qiao Lai;Lei Zhang
Polymer Bulletin 2009 Volume 63( Issue 6) pp:
Publication Date(Web):2009 December
DOI:10.1007/s00289-009-0122-3
An oligomeric fluorene with pendant TTF units (OFT) was synthesized by the Yamamoto coupling reaction using Ni(COD)2 as catalyst. The fluorescence spectra of fluorene-TTF (3a) and OFT displayed weak fluorescence intensity because of the photoinduced electron transfer (PET) interaction and energy transfer between the TTF and fluorene, while the fluorescence intensity would enhance significantly after chemical oxidation. The absorption spectra and cyclic voltammetry (CV) showed that an intramolecular interaction existed between the TTF and fluorene moieties in OFT, while in 3a such interaction could not be observed, due to the chain propagation of the fluorene backbone and an enhanced internal charge transfer interaction between the two electroactive moieties. Moreover, the conductivity showed that the doped OFT possessed a higher conductivity (1.4 × 10−3 S cm−1) than the doped 3a (9.8 × 10−5 S cm−1). These results demonstrated that OFT was a good candidate of fluorescence switches and conducting materials.
Co-reporter:Guoqiao Lai;Yibo Liu;Yu Zhang;Jun Ruan
Frontiers of Chemical Science and Engineering 2009 Volume 3( Issue 3) pp:314-317
Publication Date(Web):2009 September
DOI:10.1007/s11705-009-0207-4
Two donor-acceptor molecular systems consisted of tetrathiafulvalene (TTF) and fluorescein were designed and synthesized. The target compounds and their key intermediates were characterized by 1H NMR, mass spectrography, and infrared spectroscopy, respectively. The UV-vis spectra implied intramolecular interaction in their ground state. Fluorescence spectra and fluorescence lifetimes indicated the photoinduced charge transfer (PET) interaction between the TTF and fluorescein units in their excited states.
Co-reporter:Yu Zhang, Zheng Xu, Hai-xiao Qiu, Guo-qiao Lai, Yong-jia Shen
Journal of Photochemistry and Photobiology A: Chemistry 2009 Volume 204(Issue 1) pp:32-38
Publication Date(Web):30 April 2009
DOI:10.1016/j.jphotochem.2009.02.016
The TTF–perylene dyads 1–3 were designed and synthesized. The absorption spectra, cyclic voltammogram (CV) of dyads and the frontier orbital calculation indicated no intramolecular charge transfer (ICT) interaction in their ground state. The fluorescence spectra and theoretical calculation of the dyads 1–3 revealed the photoinduced electron transfer (PET) interaction existed in the dyads in their excited state. The chemical oxidation implied an effective reverse electron transfer from the perylene* to the TTF2+ species. The three donor–acceptor systems could be used as models for the study of photoinduced electron transfer and reverse electron transfer process.
Co-reporter:Zhilan Liu, Yan Yu, Pingniang Shen, Juan Wang, Chengyun Wang, Yongjia Shen
Separation and Purification Technology 2008 Volume 58(Issue 3) pp:343-346
Publication Date(Web):15 January 2008
DOI:10.1016/j.seppur.2007.05.011
High-speed counter-current chromatography (HSCCC) was applied to preparative separation and purification of dl-tetrahydropalmatine from Corydalis yanhusuo by a one-step separation. The two-phase system consisted of petroleum ether–ethyl acetate–methanol–water (15:30:21:20, v/v) was employed. An orthogonal design was used for optimizing the revolution speed of the separation column, flow rate of the mobile phase and separation temperature, which was 850 rpm, 1.2 ml/min and 20 °C, respectively. HPLC analysis of the fractions collected by preparative HSCCC of 200 mg of crude extracts showed that the purity of dl-tetrahydropalmatine (8.6 mg) was 96.4%. The chemical identity of the component was confirmed by 1H NMR and EI-MS.
Co-reporter:Yu Zhang, Liang-Zhen Cai, Cheng-Yun Wang, Guo-Qiao Lai and Yong-Jia Shen
New Journal of Chemistry 2008 vol. 32(Issue 11) pp:1968-1973
Publication Date(Web):04 Jun 2008
DOI:10.1039/B719844B
A donor–acceptor–donor dyad 4 involving 2-sulfur-3-methylthio-6,7-bis(hexylthio)tetrathiafulvalene (TTF) as a donor attached directly to N,N′-dibutylperylene-3,4,9,10-tetracarboxylic diimide (PDI) as an acceptor was synthesized by condensation of N,N′-dibutyl-1,6-dibromo-3,4,9,10-perylenetetracarboxylic diimide and 2-(2-cyanoethylthio-3-methylthio-6,7-bis(hexylthio)tetrathiafulvalene. The cyclic voltammetric (CV) data implied significant intramolecular interaction and the absorption spectrum indicated that there was an intramolecular charge transfer (ICT) interaction between TTF and PDI moieties in dyad 4. Comparing with PDI 13, the fluorescence emission intensity of dyad 4 was quenched almost quantitatively, which might result from the photo-induced electron transfer (PET) interaction between the PDI and TTF moieties in dyad 4. The fluorescence intensity of dyad 4 could be reversibly modulated by sequential oxidation and reduction of the TTF unit using chemical methods. Thus dyad 4 can be regarded as a new reversible fluorescence-redox dependent molecular switch.
Co-reporter:Haixiao Qiu;Chengyun Wang;Jinfeng Xu
Monatshefte für Chemie - Chemical Monthly 2008 Volume 139( Issue 11) pp:
Publication Date(Web):2008 November
DOI:10.1007/s00706-008-0863-y
Three donor–acceptor dyads 1–3 comprising of a tetrathiafulvalene (TTF) unit linked with perylene by a simple σ-bond were synthesized and characterized. Spectroscopy and cyclic voltammetry provided an indication that intramolecular charge-transfer interactions in their ground states between TTF and perylene for dyads 1–3 are negligible. Compared with the compound perylene, dyads 1–3 exhibited large fluorescence quenching, which might be ascribed to photo-induced electron transfer interaction between TTF and perylene units in the excited state.
Co-reporter:Jin-Feng Xu, Cheng-Yun Wang, Guo-Qiao Lai, Yong-Jia Shen
European Polymer Journal 2007 Volume 43(Issue 2) pp:668-672
Publication Date(Web):February 2007
DOI:10.1016/j.eurpolymj.2006.11.006
Two kinds of phenylacetylene-terminated poly(silyleneethynylene-4,4′-phenylethereneethynylene)s, {C6H5CC[Si(R)2CCC6H4OC6H4CC]nC6H5} wherein R represents methyl or phenyl, were synthesized by condensation reaction between dichlorosilanes and 4,4′-diethynyldiphenyl ether using organomagnesium reagents. The polymers were characterized by NMR, IR, gel permeation chromatography, thermogravimetric analysis, and differential scattering calorimetry.
Co-reporter:Zhilan Liu, Juan Wang, Pingniang Shen, Chengyun Wang, Yongjia Shen
Separation and Purification Technology 2006 Volume 52(Issue 1) pp:18-21
Publication Date(Web):November 2006
DOI:10.1016/j.seppur.2006.03.009
High-speed counter-current chromatography (HSCCC) was successfully applied to purify ferulic acid from the extracts of Radix Angelicae sinensis, which were extracted by microwave-assisted extraction (MAE). A solvent system consisted of n-hexane–ethyl acetate–methanol–water (3:7:5:5, v/v) was employed. The purity of ferulic acid was over 98% assayed by HPLC. The optimal extraction conditions can be concluded: 850 W of microwave power, 9 min of irradiation time, 90% of ethanol concentration, 6:1 ratio of liquid/solid, 140 min of herbal material soak time and particle sample size 250 ± 9.9 μm, the results showed that microwave-assisted extraction was a promising method for extracting ferulic acid.
Co-reporter:Tianhui Huang, Pingniang Shen, Yongjia Shen
Journal of Chromatography A 2005 Volume 1066(1–2) pp:239-242
Publication Date(Web):25 February 2005
DOI:10.1016/j.chroma.2005.01.025
High-speed counter-current chromatography (HSCCC) was successfully applied to the preparative separation and purification of deoxyschisandrin and γ-schisandrin from the crude petroleum ether extracts of Schisandra chinensis (Turcz.) Baill. The optimum solvent system composed of n-hexane–methanol–water (35:30:3, v/v) led to the successful preparation of deoxyschisandrin and γ-schisandrin. The analysis of HPLC for each peak fraction of preparative HSCCC showed that the purity of deoxyschisandrin (8 mg) was over 98% and γ-schisandrin (12 mg) was over 96% from 100 mg of the crude petroleum ether extracts in one-step separation.
Co-reporter:Yingyu Hu, Guoqiao Lai, Yongjia Shen, Yongfang Li
Dyes and Pigments 2005 Volume 66(Issue 1) pp:49-53
Publication Date(Web):July 2005
DOI:10.1016/j.dyepig.2004.08.006
Two tetrathiafulvalene (TTF)-derived metallophthalocyanine complexes were synthesized. The structures of the target compounds and their intermediates have been characterized by NMR, MS, EA, UV–VIS and mp. The results of cyclic voltammetry indicated that the presence of zinc or magnesium phthalocyanine slightly affected the first oxidation of 4,5-ethylenedithiotetrathiafulvalene (EDT-TTF) unit. The EDT-TTF unit on the peripheral sites of the zinc phthalocyanine core could be more easily oxidized than the one on the same sites of the magnesium phthalocyanine core.
