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Photophysical investigation of a donor-acceptor based Schiff base in solvents of varying polarities. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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2
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Nath S, Bhattacharya B, Sarkar U, Singh TS. Solvent Effects on the Photophysical Properties of a Donor-acceptor Based Schiff Base. J Fluoresc 2022; 32:1321-1336. [PMID: 35366165 DOI: 10.1007/s10895-022-02905-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 02/13/2022] [Indexed: 11/24/2022]
Abstract
In this work, a donor-acceptor substituted aromatic system ((E)-N-((E)-3-(4 (dimethylamino)phenyl) allylidene)-4-(trifluoromethyl) benzenamine (DPATB) has been synthesized and its detailed photophysics of intramolecular charge transfer process have been explored on the basis of steady state absorption, fluorescence and time resolved spectroscopy in combination with density functional theory calculations. Large solvent dependency fluorescence spectral shift and the calculated large excited state dipole moment clearly indicate an efficient charge transfer occurring from the donor group to the acceptor moiety in the excited state. Effect on addition of acid and pH on steady state spectral properties further reveals excited state charge transfer character. Quantum chemical calculations were performed in order to study the conformation and polarity of DPATB at their ground as well as excited electronic states. The HOMO and LUMO molecular orbital pictures are obtained at DFT level using B3LYP functional and 6-311 + g(d,p) basis set which clearly support excited state intramolecular charge transfer process. The molecular electrostatic potential maps for the optimized ground state, donor twisted and acceptor twisted geometry shed insight on the electrostatic potential and charge distribution in a system which gives information about the reacting site of the probe and nature of the reaction. In this work, detailed photophysics of excited state intramolecular charge transfer process in donor-acceptor system (DPATB) was evaluated using steady state and time-resolved fluorescence spectroscopy in combination with density functional theory calculations. Large solvent dependency fluorescence spectral shift and the calculated large excited state dipole moment clearly indicate an efficient charge transfer occurring in DPATB. Molecular orbital pictures as obtained from DFT based computational analysis reveals a significant change in the distribution of electron density upon transition from HOMO to LUMO which confirms an ICT process occurring from the donor group to the acceptor moiety in the excited state.
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Affiliation(s)
- Surjatapa Nath
- Department of Chemistry, Assam University, Silchar, Assam, India
| | | | - Utpal Sarkar
- Department of Physics, Assam University, Silchar, India
| | - T Sanjoy Singh
- Department of Chemistry, Assam University, Silchar, Assam, India.
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3
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Zhou Y, Ma L, Lunchev AV, Long S, Wu T, Ni W, Grimsdale AC, Sun L, Gurzadyan GG. Switching Pathways of Triplet State Formation by Twisted Intramolecular Charge Transfer. J Phys Chem B 2021; 125:12518-12527. [PMID: 34752093 DOI: 10.1021/acs.jpcb.1c07045] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
With the aim of constructing efficient photoelectric organic materials, a pyrido[3,2-g]quinoline derivative named LA17b has been synthesized, and its photodynamic relaxation processes in solvents and films were studied by time-resolved fluorescence and femtosecond transient absorption techniques. The steady-state fluorescence spectra show pronounced red-shift with the increase of the solvent polarity as well as in binary solvent hexane/ethanol by increasing ethanol concentration. However, the strong red-shift does not lead to quenching of the fluorescence. This is explained in terms of a twisted intramolecular charge transfer (TICT) state. The TICT state of LA17b in ethanol is highly emissive with a long fluorescence lifetime: 1.1 ns. TICT state was shown to play an important role in enhancement of intersystem crossing rate. TD-DFT calculations confirm the pathways of relaxation of locally excited state via TICT and triplet states. In films, the photodynamic properties are similar to that of LA17b in hexane and the TICT state vanishes due to the rigid environment. The obtained optical properties of this molecule suggest that it can be a promising candidate for various optoelectronic applications.
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Affiliation(s)
- Yichen Zhou
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China
| | - Lin Ma
- School of Physics and Optoelectronic Engineering, Guangdong University of Technology, 510006, Guangdong, China
| | - Andrey V Lunchev
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Saran Long
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China
| | - Tong Wu
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China
| | - Wenjun Ni
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China
| | - Andrew C Grimsdale
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore
| | - Licheng Sun
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China.,Center of Artificial Photosynthesis for Solar Fuels, School of Science, Westlake University, 310024, Hangzhou, China
| | - Gagik G Gurzadyan
- State Key Laboratory of Fine Chemicals, Institute of Artificial Photosynthesis, Dalian University of Technology, 116024, Dalian, China
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Carbazole-hydrazinobenzothiazole a selective turn-on fluorescent sensor for Hg2+ions – Its protein binding and electrochemical application studies. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113303] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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5
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Synthesis, characterization and photophysical-theoretical analysis of compounds A-π-D. 1. Effect of alkyl-phenyl substituted amines in photophysical properties. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Jiang L, Lan R, Huang T, Chan CF, Li H, Lear S, Zong J, Wong WY, Muk-Lan Lee M, Dow Chan B, Chan WL, Lo WS, Mak NK, Li Lung M, Lok Lung H, Wah Tsao S, Taylor GS, Bian ZX, Tai WCS, Law GL, Wong WT, Cobb SL, Wong KL. EBNA1-targeted probe for the imaging and growth inhibition of tumours associated with the Epstein–Barr virus. Nat Biomed Eng 2017. [DOI: 10.1038/s41551-017-0042] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kundu P, Banerjee D, Maiti G, Chattopadhyay N. Dehydrogenation induced inhibition of intramolecular charge transfer in substituted pyrazoline analogues. Phys Chem Chem Phys 2017; 19:11937-11946. [DOI: 10.1039/c7cp01121k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental and computational studies reveal that dehydrogenation of the pyrazoline ring modifies its ground and excited state photophysics radically by restricting the ICT process.
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Affiliation(s)
- Pronab Kundu
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
| | | | - Gourhari Maiti
- Department of Chemistry
- Jadavpur University
- Kolkata-700032
- India
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Li H, Liu Y, Yang Y, Yang D, Sun J. Excited-state intramolecular hydrogen bonding of compounds based on 2-(2-hydroxyphenyl)-1,3-benzoxazole in solution: a TDDFT study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:818-824. [PMID: 25000569 DOI: 10.1016/j.saa.2014.06.072] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2014] [Revised: 04/25/2014] [Accepted: 06/01/2014] [Indexed: 06/03/2023]
Abstract
The excited-state properties of intramolecular hydrogen bonding in the compounds based on 2-(2-hydroxyphenyl)-1,3-benzoxazole (6 and its tautomers 6a and 6b) have been investigated using theoretical methods. According to the geometric optimization and IR spectra in the ground and excited states calculated by density functional theory (DFT) and time-dependent DFT (TD-DFT) methods respectively, the type of intramolecular hydrogen bonding N⋯HO in 6 and 6a is demonstrated to be significantly strengthened, while NH⋯O in the tautomers 6a and 6b are proved to be sharply weakened upon excitation to excited state S1. The calculated absorption peaks of 6 are in good accordance with the experimental results. Moreover, other compounds based on 6 that R1 and R2 are both substituted as well as that only R1 is substituted are investigated to understand the effect of substituent on intramolecular hydrogen bonding. It is found that the hydrogen bond strength can be controlled by the inductive field effect of the substituent. In addition, the intramolecular charge transfers (ICT) of the S1 state for 6 and its tautomers 6a and 6b were theoretically investigated by analyses of molecular orbital.
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Affiliation(s)
- Hui Li
- Department of Physics, Henan Normal University, Xinxiang 453007, China
| | - Yufang Liu
- Department of Physics, Henan Normal University, Xinxiang 453007, China.
| | - Yonggang Yang
- Department of Physics, Henan Normal University, Xinxiang 453007, China
| | - Dapeng Yang
- Physics Laboratory, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
| | - Jinfeng Sun
- Department of Physics, Henan Normal University, Xinxiang 453007, China
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Bhalla V, Roopa, Kumar M, Sharma PR, Kaur T. Hg2+ induced hydrolysis of pentaquinone based Schiff base: a new chemodosimeter for Hg2+ ions in mixed aqueous media. Dalton Trans 2013; 42:15063-8. [DOI: 10.1039/c3dt51273h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ghosh S, Jana S, Guchhait N. Domain Specific Association of Small Fluorescent Probe trans-3-(4-Monomethylaminophenyl)-Acrylonitrile (MMAPA) with Bovine Serum Albumin (BSA) and Its Dissociation from Protein Binding Sites by Ag Nanoparticles: Spectroscopic and Molecular Docking Study. J Phys Chem B 2012; 116:1155-63. [DOI: 10.1021/jp2094752] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shalini Ghosh
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
| | - Sankar Jana
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
| | - Nikhil Guchhait
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata-700009, India
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Chai Y, Sun H, Pan Y, Sun C. N-centered odd-electron ions formation from collision-induced dissociation of electrospray ionization generated even-electron ions: single electron transfer via ion/neutral complex in the fragmentation of protonated N,N'-dibenzylpiperazines and protonated N-benzylpiperazines. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1526-1533. [PMID: 21953256 DOI: 10.1007/s13361-011-0176-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2011] [Revised: 05/19/2011] [Accepted: 05/19/2011] [Indexed: 05/31/2023]
Abstract
Single electron transfer (SET) via ion/neutral complex (INC) was proposed and confirmed to be the key step in the formation of N-centered odd-electron ions from fragmentation of protonated even-electron ions in the present study. Upon collisional activation, the model compounds, protonated N,N'-dibenzylpiperazine and protonated N-benzylpiperazines initially dissociated to form intermediate INCs consisting of N-benzylpiperazine (or piperazine) and benzyl cation. In these ion/neutral complexes, SET reaction and direct separation as well as other reactions were observed and characterized experimentally and theoretically. Density functional theory calculations demonstrated that the energy requirement for homolysis of the precursor ion was so large that it could not be achieved, whereas the heterolytic dissociation followed by electron transfer via INC was energetically preferred. The SET process occurred only when the radical products were more stable than the separation products. The energy barrier for SET in the compounds studied was roughly estimated by comparison with other competing reactions. When the INC contained electron donor with lower ionization energy and electron acceptor with higher electron affinity, the SET reaction was more efficient.
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Affiliation(s)
- Yunfeng Chai
- Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang, 310027, China
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Jana S, Dalapati S, Ghosh S, Kar S, Guchhait N. Excited State Charge Transfer reaction with dual emission from 5-(4-dimethylamino-phenyl)-penta-2,4-dienenitrile: Spectral measurement and theoretical density functional theory calculation. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.05.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Sowmiya M, Tiwari AK, Sonu, Saha SK. Study on intramolecular charge transfer fluorescence properties of trans-4-[4′-(N,N′-dimethylamino)styryl]pyridine: Effect of solvent and pH. J Photochem Photobiol A Chem 2011. [DOI: 10.1016/j.jphotochem.2010.12.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Jana S, Ghosh S, Dalapati S, Kar S, Guchhait N. Photoinduced intramolecular charge transfer phenomena in 5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:463-468. [PMID: 21163692 DOI: 10.1016/j.saa.2010.11.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 10/20/2010] [Accepted: 11/15/2010] [Indexed: 05/28/2023]
Abstract
A donor acceptor substituted aromatic system 5-(4-dimethylamino-phenyl)-penta-2,4-dienoic acid (DMAPPDA) has been synthesized and its spectral properties have been explored on the basis of steady state absorption and fluorescence spectroscopy. Spectral features point largely towards a possible occurrence of photoinduced intramolecular charge transfer process from the donor NMe2 group to the acceptor acid group. Solvent dependency of the large Stokes' shifted emission band and the calculated large excited state dipole moment support the polar character of the charge transfer excited state. Quantum yield calculations and effect of addition of acid and base on the steady state spectra were also performed to further scrutinize the excited state CT character.
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Affiliation(s)
- Sankar Jana
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
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16
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Laser-induced fluorescence and dispersed fluorescence studies of the donor–acceptor system 4-amino 3-methyl benzoic acid methyl ester and its solvated clusters: Evidence of excited-state charge-transfer reaction. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.05.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Shiraishi Y, Suzuki T, Hirai T. Photosensitized isomerization of olefin with benzophenone-conjugated amphiphilic graft copolymers. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.05.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Samanta A, Paul BK, Mahanta S, Singh RB, Kar S, Guchhait N. Evidence of acid mediated enhancement of photoinduced charge transfer reaction in 2-methoxy-4-(N,N-dimethylamino)benzaldehyde: Spectroscopic and quantum chemical study. J Photochem Photobiol A Chem 2010. [DOI: 10.1016/j.jphotochem.2010.04.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Manna A, Chakravorti S. Charge Transfer in 1,8-Naphthalimide: A Combined Theoretical and Experimental Approach. Photochem Photobiol 2010; 86:47-54. [DOI: 10.1111/j.1751-1097.2009.00625.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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20
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Electronic properties of 1-methyl-4-phenyl-1H-tetrazole-5(4H)-thiones: An experimental and theoretical study. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.05.049] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Chakraborty A, Ghosh S, Kar S, Nath D, Guchhait N. Dual emission from (E)-3-(4-methylamino-phenyl)-acrylic acid ethyl ester (MAPAEE) and its application as fluorescence probe for studying micellar and protein microenvironment. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2008.07.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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22
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Mahanta S, Singh RB, Kar S, Guchhait N. Evidence of coupled photoinduced proton transfer and intramolecular charge transfer reaction in para-N,N-dimethylamino orthohydroxy benzaldehyde: Spectroscopic and theoretical studies. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.10.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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23
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Mahanta S, Singh RB, Nath D, Guchhait N. Photophysical properties of 2,3,6,7-tetrahydro-8-hydroxy-1H, 5H-benz[i,j] quinolizine-9-carboxaldehyde: Evidence of excited state intramolecular proton transfer but not of intramolecular charge transfer process. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.12.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Shiraishi Y, Miyamoto R, Hirai T. A hemicyanine-conjugated copolymer as a highly sensitive fluorescent thermometer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:4273-4279. [PMID: 18315023 DOI: 10.1021/la703890n] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A simple-structured copolymer, poly(NIPAM-co-HC), consisting of N-isopropylacrylamide (NIPAM) and 4-(4-dimethylaminostyryl)pyridine (hemicyanine, HC) units as thermoresponsive and fluorescent signaling parts, respectively, has been synthesized. This copolymer dissolved in water shows very weak fluorescence at <25 degrees C, while showing fluorescence enhancement at >25 degrees C. The fluorescence intensity increases with a rise in temperature and saturates at >40 degrees C, enabling temperature detection at 25-40 degrees C. The fluorescence enhancement is driven by a heat-induced phase transition of the polymer from coil to globule state. The HC units within the coil state polymer exist as the nonfluorescent benzenoid form; however, the less polar domain formed inside the globule state polymer leads to transformation of the HC unit to the fluorescent quinoid form, resulting in heat-induced fluorescence enhancement. The fluorescence intensity measured at 40 degrees C is >20-fold higher than the intensity at <25 degrees C, which is the highest enhancement value among the fluorescent thermometers proposed so far. The polymer shows reversible fluorescence enhancement/quenching, regardless of the heating/cooling process. In addition, the polymer shows high reusability with a simple recovery process.
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Affiliation(s)
- Yasuhiro Shiraishi
- Research Center for Solar Energy Chemistry, and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Japan.
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Chen R, Zhao G, Yang X, Jiang X, Liu J, Tian H, Gao Y, Liu X, Han K, Sun M, Sun L. Photoinduced intramolecular charge-transfer state in thiophene-π-conjugated donor–acceptor molecules. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.05.045] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Photoinduced intramolecular charge transfer in methyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid: Spectroscopic measurement and quantum chemical calculations. J Photochem Photobiol A Chem 2008. [DOI: 10.1016/j.jphotochem.2007.08.030] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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27
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Spectroscopic study of excited state intramolecular charge transfer in ethyl ester of N,N′-Dimethylaminonaphthyl-(acrylic)-acid. Chem Phys 2007. [DOI: 10.1016/j.chemphys.2007.09.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Chakraborty A, Kar S, Nath DN, Guchhait N. Photoinduced Intramolecular Charge Transfer Reaction in (E)-3-(4-Methylamino-phenyl)-acrylic Acid Methyl Ester: A Fluorescence Study in Combination with TDDFT Calculation. J Phys Chem A 2006; 110:12089-95. [PMID: 17078602 DOI: 10.1021/jp0629846] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A donor-acceptor substituted aromatic system (E)-3-(4-Methylamino-phenyl)-acrylic acid methyl ester (MAPAME) has been synthesized, and its photophysical behavior obtained spectroscopically has been compared with the theoretical results. The observed dual fluorescence from MAPAME has been assigned to emission from locally excited and twisted intramolecular charge transfer states. The donor and acceptor angular dependency on the ground and excited states potential energy surfaces have been calculated both in vacuo and in acetonitrile solvent using time dependent density functional theory (TDDFT) and TDDFT polarized continuum model (TDDFT-PCM), respectively. Calculation predicts that a stabilized twisted excited state is responsible for red shifted charge transfer emission.
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Affiliation(s)
- Amrita Chakraborty
- Department of Chemistry, University of Calcutta, 92, A.P.C. Road, Kolkata 700009, India
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