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The suppression of intramolecular charge transfer emission by tautomerism in 2-(4′-amino-2′-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine: Intramolecular proton transfer versus intermolecular proton transfer. J Photochem Photobiol A Chem 2021. [DOI: 10.1016/j.jphotochem.2021.113199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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2
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Das M, Brahma M, Krishnamoorthy G. Light-Driven Switching between Intramolecular Proton-Transfer and Charge-Transfer States. J Phys Chem B 2021; 125:2339-2350. [PMID: 33646785 DOI: 10.1021/acs.jpcb.0c09705] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A molecular photoswitch, 2-(4'-diethylamino-2'-hydroxyphenyl)-1H-imidazo-[4,5-b]pyridine (DHP), with mutually independent paths of excited-state intramolecular proton transfer (ESIPT) and twisted intramolecular charge transfer (TICT) was developed. Control over these processes was attained by switching the solvents. Depending on the solvent's hydrogen-bond capacity and polarity, either one of the photoprocesses (ESIPT or TICT) or both can be triggered. Accordingly, normal and tautomer emissions, normal and TICT emissions, or triple emission of normal, tautomer, and TICT were obtained from the molecule. The emissions were resolved by fluorescence lifetime. The conclusions were established by synthesizing and studying the methoxy derivative of the molecule.
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Affiliation(s)
- Minati Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - Mongoli Brahma
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
| | - G Krishnamoorthy
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 781039, India
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3
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Perturbation of proton transfer of 2-(2′-hydroxyphenyl)benzimidazole and its nitrogenous analogues by nanoparticles. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.128352] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Pyridyl substitution control dynamics and shape dependence of fluorescent aggregates. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Mohapatra M, Mishra AK. Excited state proton transfer based fluorescent molecular probes and their application in studying lipid bilayer membranes. Photochem Photobiol Sci 2019; 18:2830-2848. [DOI: 10.1039/c9pp00294d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The distribution and prototropic equilibria of 1-naphthol (NpOH) in lipid bilayer membrane.
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Affiliation(s)
| | - Ashok Kumar Mishra
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
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6
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Tang Z, Lu M, Liu K, Zhao Y, Qi Y, Wang Y, Zhang P, Zhou P. Solvation effect on the ESIPT mechanism of 2-(4′-amino-2′-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.08.028] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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7
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Sahu S, Dutta S, Krishnamoorthy G. An unusual deprotonation trend in 2-(2'-hydroxyphenyl)pyridoimidazoles. Phys Chem Chem Phys 2016; 18:29905-29913. [PMID: 27759124 DOI: 10.1039/c6cp05932e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The anion sensitivity and the deprotonation nature of the nitrogenous analogues of 2-(2'-hydroxyphenyl)benzimidazole (HPBI) are investigated in a polar aprotic medium. It is observed that the substitution of pyridyl nitrogen enhances the anion sensitivity. However, despite the enhanced sensitivity of the nitrogenous analogues the deprotonation of these molecules in the presence of strong anions is less favored as compared to HPBI. This anomalous trend observed for the nitrogenous analogs is discussed and explained using theoretical calculations and experimental findings. It is also found that the sensitivity towards anions and the formation of anions also depend on the position of the pyridyl nitrogen.
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Affiliation(s)
- Saugata Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam-781039, India.
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8
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Sahu S, Das M, Krishnamoorthy G. Switching between cis and trans anions of 2-(2'-hydroxyphenyl)benzimidazole: a molecular rotation perturbed by chemical stabilization. Phys Chem Chem Phys 2016; 18:11081-90. [PMID: 27051888 DOI: 10.1039/c5cp07949g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Despite the fact that 2-(2'-hydroxyphenyl)benzimidazole (HPBI) exists as the cis and trans enol in neutral form, it was reported to exist only in the trans form upon deprotonation in an aqueous medium. It was also shown that the dianion formed in the ground state can be re-protonated to form the trans-anion in the excited state. In the present study, the cis-anion and dianion could be obtained upon proper stabilization in suitable environments. Switching between the cis and trans-anion was demonstrated to be possible by changing the environment. Theoretical calculations were performed to substantiate the existence of the cis-anion and dianion. In contrast to a literature report, it was shown that the 'OH' group deprotonates before the 'NH' group to form a monoanion not only in protic solvents but also in aprotic solvents.
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Affiliation(s)
- Saugata Sahu
- Department of chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India - 781039.
| | - Minati Das
- Department of chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India - 781039.
| | - G Krishnamoorthy
- Department of chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India - 781039.
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9
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Omidyan R, Iravani M. Excited State Proton Transfer and Deactivation Mechanism of 2-(4′-Amino-2′-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine and Its Analogues: A Theoretical Study. J Phys Chem A 2016; 120:1012-9. [DOI: 10.1021/acs.jpca.5b12122] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Reza Omidyan
- Department of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran
| | - Maryam Iravani
- Department of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran
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10
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Santos FS, Ramasamy E, Ramamurthy V, Rodembusch FS. Excited state behavior of benzoxazole derivatives in a confined environment afforded by a water soluble octaacid capsule. J Photochem Photobiol A Chem 2016. [DOI: 10.1016/j.jphotochem.2015.08.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Behera SK, Sadhuragiri G, Elumalai P, Sathiyendiran M, Krishnamoorthy G. Exclusive excited state intramolecular proton transfer from a 2-(2′-hydroxyphenyl)benzimidazole derivative. RSC Adv 2016. [DOI: 10.1039/c6ra11780e] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The existence of trans-enol was made unviable by crafting a steric hindrance that stops the normal emission of bis-HPBI.
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Affiliation(s)
| | | | - Palani Elumalai
- School of Chemistry
- University of Hyderabad
- Hyderabad 500046
- India
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12
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Chipem FAS, Malakar A, Krishnamoorthy G. Intramolecular Proton Transfer in 2-(2′-hydroxyphenyl)oxazolo[4,5-b]pyridine: Evidence for Tautomer in the Ground State. Photochem Photobiol 2015; 91:298-305. [DOI: 10.1111/php.12411] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2014] [Accepted: 12/14/2014] [Indexed: 01/19/2023]
Affiliation(s)
- Francis A. S. Chipem
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati India
| | - Ashim Malakar
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati India
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13
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Behera SK, Karak A, Krishnamoorthy G. Photophysics of 2-(4'-amino-2'-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine and its analogues: intramolecular proton transfer versus intramolecular charge transfer. J Phys Chem B 2014; 119:2330-44. [PMID: 25337987 DOI: 10.1021/jp5064808] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Photophysical characteristics of 2-(4'-amino-2'-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine (AHPIP-c) have been studied in various aprotic and protic solvents using UV-visible, steady state fluorescence and time-resolved fluorescence spectroscopic techniques. To comprehend the competition between the intramolecular charge transfer (ICT) and the excited state intramolecular proton transfer (ESIPT) processes, the photophysical properties of 2-(4'-amino-2'-methoxyphenyl)-1H-imidazo-[4,5-c]pyridine (AMPIP-c) and 2-(4'-aminophenyl)-1H-imidazo-[4,5-c]pyridine (APIP-c) were also investigated. Though APIP-c displays twisted ICT (TICT) emission in protic solvents, AHPIP-c exhibits normal and tautomer emissions in aprotic as well as in protic solvents due to ESIPT. However, the methoxy derivative, AMPIP-c, emits weak TICT fluorescence in methanol.
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Affiliation(s)
- Santosh Kumar Behera
- Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, India
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14
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Chipem FAS, Behera SK, Krishnamoorthy G. Excited state proton transfer of 2-(2′-hydroxyphenyl)benzimidazole and its nitrogen substituted analogues in bovine serum albumin. Photochem Photobiol Sci 2014; 13:1297-304. [DOI: 10.1039/c4pp00099d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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15
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Chipem FAS, Krishnamoorthy G. Temperature Effect on Dual Fluorescence of 2-(2′-Hydroxyphenyl)benzimidazole and Its Nitrogen Substituted Analogues. J Phys Chem B 2013; 117:14079-88. [DOI: 10.1021/jp405804c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Francis A. S. Chipem
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, India
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16
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17
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Chipem FAS, Behera SK, Krishnamoorthy G. Enhancing Excited State Intramolecular Proton Transfer in 2-(2′-Hydroxyphenyl)benzimidazole and Its Nitrogen-Substituted Analogues by β-Cyclodextrin: The Effect of Nitrogen Substitution. J Phys Chem A 2013; 117:4084-95. [DOI: 10.1021/jp311438s] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Francis A. S. Chipem
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - Santosh Kumar Behera
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
| | - G. Krishnamoorthy
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India
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18
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Satam MA, Raut RK, Tathe AB, Sekar N. Synthesis and Characterization of Molecules Containing Thiazole and Oxazole Moieties and Study of ESIPT Phenomenon. J Fluoresc 2012; 22:1237-48. [DOI: 10.1007/s10895-012-1064-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Accepted: 05/28/2012] [Indexed: 10/28/2022]
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19
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Chipem FAS, Dash N, Krishnamoorthy G. Role of nitrogen substitution in phenyl ring on excited state intramolecular proton transfer and rotamerism of 2-(2′-hydroxyphenyl)benzimidazole: A theoretical study. J Chem Phys 2011; 134:104308. [DOI: 10.1063/1.3562124] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Jin R, Zhang J, Hao L. Theoretical study of the excited-state intramolecular proton transfer and rotamerism in 2,5-bis(2-hydroxyphenyl)-1,3,4-oxadiazole. Theor Chem Acc 2009. [DOI: 10.1007/s00214-009-0694-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Chipem FAS, Krishnamoorthy G. Comparative Theoretical Study of Rotamerism and Excited State Intramolecular Proton Transfer of 2-(2′-Hydroxyphenyl)benzimidazole, 2-(2′-Hydroxyphenyl)imidazo[4,5-b]pyridine, 2-(2′-Hydroxyphenyl)imidazo[4,5-c] pyridine and 8-(2′-Hydroxyphenyl)purine. J Phys Chem A 2009; 113:12063-70. [DOI: 10.1021/jp903535g] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Francis A. S. Chipem
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - G. Krishnamoorthy
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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22
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Lorenc J. Solvent effect and quantum chemical calculations of the electron energy levels for nitro derivatives of 2-(N-methylamino)-picolines. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2005.03.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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New fluorescent monomers and polymers displaying an intramolecular proton-transfer mechanism in the electronically excited state (ESIPT). J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.01.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Lewanowicz A, Olszowski A, Dziekoński P, Leszczyński J. Spectroscopic characteristics of the micro-environmentally induced H-bond transformation in anil-type species: experimental and theoretical study. J Mol Model 2005; 11:398-406. [PMID: 15871034 DOI: 10.1007/s00894-005-0262-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2004] [Accepted: 02/07/2005] [Indexed: 11/29/2022]
Abstract
The results of combined experimental and theoretical investigations of the spectral behavior of anil-type systems are presented. Two species: N-triphenylmethylsalicylidene imine (MS1) and N-salicylidene methylamine (SmA) were studied. The electronic (absorption, emission and excitation) spectra of MS1 at room temperature were investigated in pure isooctane as well as in acetonitrile and methanol solutions by the steady-state experiments. A mechanism of molecular processes in the ground and excited states in different microenvironments is also proposed. It includes formation of intra- and intermolecular hydrogen bonds, their role in stabilization of molecular conformations and conformation equilibria. The "solvent assisted" proton transfer reaction and rearrangement were modeled using complexes obtained by attaching methanol molecules to the species studied. The OH-rotamer of SmA was also considered. Infrared and Raman spectra were predicted for MS1 and SmA and compared with the experimental data. An analysis of fundamental vibration frequencies was carried out. Quantum chemical ab initio calculations at the HF/6-31G** level were performed for the species studied and their complexes. Chemical formula of anil-type compound: N-salicylidene methylamine (SmA), N-salicylideneaniline (SA) and N-triphenylmethylsalicylidene imine (MS1). [Structure: see text].
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Affiliation(s)
- Aleksandra Lewanowicz
- Institute of Physical and Theoretical Chemistry, Wrocław University of Technology, Wybrzeze S. Wyspiańskiego 27, PL 50-370, Wrocław, Poland.
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25
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Excited state prototropism in 2-aminonicotinic acid: effect of solvents and acid–base concentrations. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.09.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Dogra S. Excited state intramolecular proton transfer in anionic and cationic species of 2-(2′-amino-3-pyridyl)benzimidazole. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.12.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Nayak MK, Dogra SK. Inter- and intramolecular excited state proton transfer in 2-hydroxy-9H-carzole-1-carboxylic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:1247-1257. [PMID: 15741129 DOI: 10.1016/j.saa.2004.06.049] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2003] [Accepted: 06/21/2004] [Indexed: 05/24/2023]
Abstract
Absorption, fluorescence and fluorescence excitation spectroscopy and single photon counting time dependence spectrofluorimetry have been used to study the inter- and intramolecular excited state proton transfer (ESIPT) reactions in 2-hydroxy-9H-carbazole-1-carboxylic acid (2-HCA). Except in cyclohexane and water (pH 5) dual fluorescence is observed in rest of the solvents used. Normal Stokes shifted band seems to originate from 2-HCA-1-c and tautomer emission band from the tautomer formed by ESIPT in 2-HCA-1-c followed by structural reorganization. Both these emission band systems originate from the same ground state species. AM1 and CNDO/S-CI calculations have been carried out to establish the identity of the species. Different prototropic equilibria have been determined and discussed.
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Affiliation(s)
- M K Nayak
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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28
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Dogra S. Spectral characteristics of 2-(2′-hydroxy-3′-pyridyl)benzimidazole: effects of solvents and acid or base concentrations. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.08.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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29
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Franciscato Campo L, Severo Rodembusch F, Stefani V. New fluorescent monomers and polymers displaying an intramolecular proton-transfer mechanism in the electronically excited state (ESIPT). IV. Synthesis of acryloylamide and diallylamino benzazole dyes and its copolymerization with MMA. J Appl Polym Sci 2005. [DOI: 10.1002/app.22520] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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30
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Nayak MK, Dogra S. Photophysics of 1-hydroxy-9-fluorenone: absence of excited state intramolecular proton transfer reaction. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.05.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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31
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Balamurali M, Dogra S. Photophysics of 2-(6′-hydroxy-3′-pyridyl)benzimidazole: effect of solvents and acid–base concentrations. J Mol Struct 2004. [DOI: 10.1016/j.molstruc.2004.03.053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Excited state intramolecular proton transfer in 2-(2′-amino-3-pyridyl)-benzimidazole: effect of solvents. Chem Phys 2004. [DOI: 10.1016/j.chemphys.2004.06.037] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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