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Kumar V. 2-Naphthoic acid prototropism within ionic liquid based media. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Al-Aqmar DM, Al-Shamiri HAS, Al-Shareef JM, Abou Kana MTH, Kandel HM. Spectroscopic and Photo-Physical Properties of Near-IR Laser Dye in Novel Benign Green Solvents. J Fluoresc 2020; 30:1095-1103. [PMID: 32632719 DOI: 10.1007/s10895-020-02576-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 06/23/2020] [Indexed: 01/31/2023]
Abstract
IR-792 as near IR (NIR) laser dye was dissolved with different concentrations in two types of ionic liquids (ILs) of different anion and cation, 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide (EMIM TFSI) & 1-Butyl-3-methylimidazolium tetrafluoroborate (BMIM BF4), as the benign green solvent and in methanol (MeOH) as a standard solvent. The behavior of fluorescence of IR-792 dye was studied. The fluorescence of IR-792 dissolved in the ILs was heavily compared to organic solvent. Some photo-physical parameters of IR-792 were calculated. Mainly, IR-792 had a very low quantum yield of fluorescence with high intersystem crossing rate & fluorescence lifetime in picosecond range. Optical absorption and behavior of fluorescence for the rigorously the purified imidazolium ILs in the neat condition and effect of IR-792 on their fluorescence have been examined. The emission behavior of IR-792 in green solvents was independent upon the wavelength of excitation, while the emission behavior of green solvents dependent upon the wavelength of excitation whether in pure state or with NIR laser dye. At most, the intensity of fluorescence of ILs is dependent upon dye concentration.
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Affiliation(s)
- Dalal M Al-Aqmar
- National Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypt.,Physics Department, Ibb University, Ibb, Yemen
| | - Hamdan A S Al-Shamiri
- Physics Department, Faculty of Science, Bisha University, P.O. Box 551, Bisha, 61922, Saudi Arabia.,Physics Department, Faculty of Applied Science, Taiz University, Taiz, Yemen
| | - Jamal M Al-Shareef
- Physics Department, Sana'a University, Sana'a, Yemen.,Biophysics Department, Faculty of Science, Cairo University, Cairo, Egypt
| | - Maram T H Abou Kana
- National Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypt.
| | - Hamed M Kandel
- National Institute of Laser Enhanced Sciences, Cairo University, Giza, Egypt
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Liu Y, Yang Y, Jia X, Ma Q, He Y, Zhai H, Zhang Y, Liu Y. Theoretical study of the excited state intramolecular double proton transfer and spectral behaviors of 7-hydroxyquinoline-8-carboxylic acid. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112552] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Gomez E, Alarcos N, Monterde C, Sánchez F, Moreno M, Douhal A. Experimental and theoretical insights into the influence of electronic density on proton-transfer reactions. Phys Chem Chem Phys 2018; 20:27149-27161. [PMID: 30334550 DOI: 10.1039/c8cp03185a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the excited-state behavior of proton-transfer phenanthroimidazole derivatives, such as HPPI and NMHPPI, in solutions using steady-state and femto- to nanosecond time-resolved fluorescence spectroscopies. Experimental observations are supported by theoretical calculations (TDDFT). In dichloromethane (DCM) and acetonitrile (ACN), two different paths are found for the excited-state intramolecular proton-transfer (ESIPT) reactions following two different channels. A fast and direct channel (ESIPT1) in 1-2.5 ps and a slower one (ESIPT2) in 12-15 ps, the latter being more influenced by the solvent viscosity (30 ps for HPPI and 20 ps for NMHPPI in triacetin (TAC) solutions). The slowing down of the ESIPT2 reaction is explained in terms of an intramolecular charge transfer (ICT) reaction coupled to a twisting motion to reach a more suitable conformation of the involved parts in the proton-transfer motion. The absence of OH/OD exchange effects in the ultrafast and slow proton-transfer dynamics suggests that the ESIPT reactions, which involve intramolecular and solvent coordinates, do not occur via tunneling. These results reveal new insights into the photobehavior of proton-transfer dyes, which might help in designing photosensors or lighting devices.
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Affiliation(s)
- Eduardo Gomez
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
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Alarcos N, Cohen B, Ziółek M, Douhal A. Photochemistry and Photophysics in Silica-Based Materials: Ultrafast and Single Molecule Spectroscopy Observation. Chem Rev 2017; 117:13639-13720. [PMID: 29068670 DOI: 10.1021/acs.chemrev.7b00422] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Silica-based materials (SBMs) are widely used in catalysis, photonics, and drug delivery. Their pores and cavities act as hosts of diverse guests ranging from classical dyes to drugs and quantum dots, allowing changes in the photochemical behavior of the confined guests. The heterogeneity of the guest populations as well as the confinement provided by these hosts affect the behavior of the formed hybrid materials. As a consequence, the observed reaction dynamics becomes significantly different and complex. Studying their photobehavior requires advanced laser-based spectroscopy and microscopy techniques as well as computational methods. Thanks to the development of ultrafast (spectroscopy and imaging) tools, we are witnessing an increasing interest of the scientific community to explore the intimate photobehavior of these composites. Here, we review the recent theoretical and ultrafast experimental studies of their photodynamics and discuss the results in comparison to those in homogeneous media. The discussion of the confined dynamics includes solvation and intra- and intermolecular proton-, electron-, and energy transfer events of the guest within the SBMs. Several examples of applications in photocatalysis, (photo)sensors, photonics, photovoltaics, and drug delivery demonstrate the vast potential of the SBMs in modern science and technology.
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Affiliation(s)
- Noemí Alarcos
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Boiko Cohen
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
| | - Marcin Ziółek
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University , Umultowska 85, 61-614 Poznań, Poland
| | - Abderrazzak Douhal
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha , Avenida Carlos III, S.N., 45071 Toledo, Spain
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Alarcos N, Gutiérrez M, Liras M, Sánchez F, Moreno M, Douhal A. Direct observation of breaking of the intramolecular H-bond, and slowing down of the proton motion and tuning its mechanism in an HBO derivative. Phys Chem Chem Phys 2016; 17:14569-81. [PMID: 25966780 DOI: 10.1039/c5cp01437a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We report on spectroscopic and photodynamical behaviours of 5-amino-2-(2'-hydroxyphenyl)benzoxazole (5A-HBO) in different solutions. The dye undergoes an ultrafast ICT reaction (<50 fs) (comparable to that observed for its methylated derivative, 5A-MBO), in agreement with the results of TD-DFT theoretical calculations (gas phase). Depending on the used solvent, the ICT reaction can be followed by a reversible/irreversible excited-state intramolecular proton transfer (ESIPT) reaction or by breaking of the intramolecular hydrogen bond (IHB). 5A-HBO in n-heptane solution exhibits an irreversible and slow (20 ps) ESIPT reaction, while that of the parent compound, HBO, takes place in less than 150 fs. Compared to excited HBO behaviour, theoretical calculations on 5A-HBO suggest a higher energy barrier (∼4 kcal mol(-1)) between the relaxed enol and keto tautomers, in addition to a less stabilization of the latter, which is in agreement with experiments in n-heptane. On the other hand, in dichloromethane, after the ICT reaction a subsequent and reversible proton motion occurs in an extraordinary slower regime (ns-time scale). No isotopic effect (OH/OD exchange) was observed in this solvent reflecting that the reversible ESIPT reaction evolves along the IHB and solvent coordinates. Using tetrahydrofurane and acetonitrile, we observed a breaking of the IHB due to specific intermolecular interactions with solvent molecules. This leads to the formation of open-enol forms, which undergo an ICT reaction as it occurs in 5A-MBO. These results bring new findings in the coupled ICT and ESIPT reactions. The photobehaviour of this new dye remarkably changes with the solvent nature, opening up the window for further research and possible applications in sensing polarity or H-bonding of media similar to that of the biological ones.
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Affiliation(s)
- Noemí Alarcos
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
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Alarcos N, Gutierrez M, Liras M, Sánchez F, Douhal A. An abnormally slow proton transfer reaction in a simple HBO derivative due to ultrafast intramolecular-charge transfer events. Phys Chem Chem Phys 2015; 17:16257-69. [PMID: 25870162 DOI: 10.1039/c5cp00577a] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We report on the steady-state, picosecond and femtosecond time-resolved studies of a charge and proton transfer dye 6-amino-2-(2'-hydroxyphenyl)benzoxazole (6A-HBO) and its methylated derivative 6-amino-2-(2'-methoxyphenyl)benzoxazole (6A-MBO), in different solvents. With femtosecond resolution and comparison with the photobehaviour of 6A-MBO, we demonstrate for 6A-HBO in solution, the photoproduction of an intramolecular charge-transfer (ICT) process at S1 taking place in ∼140 fs or shorter, followed by solvent relaxation in the charge transferred species. The generated structure (syn-enol charge transfer conformer) experiences an excited-state intramolecular proton-transfer (ESIPT) reaction to produce a keto-type tautomer. This subsequent proton motion occurs in 1.2 ps (n-heptane), 14 ps (DCM) and 35 ps (MeOH). In MeOH, it is assisted by the solvent molecules and occurs through tunneling for which we got a large kinetic isotope effect (KIE) of about 13. For the 6A-DBO (deuterated sample in CD3OD) the global proton-transfer reaction takes place in 200 ps, showing a remarkable slow KIE regime. The slow ESIPT reaction in DCM (14 ps), not through tunnelling as it is not sensitive to OH/OD exchange, has however to overcome an energy barrier using intramolecular as well as solvent coordinates. The rich ESIPT dynamics of 6A-HBO in the used solutions is governed by an ICT reaction, triggered by the amino group, and it is solvent dependent. Thus, the charge injection to a 6A-HBO molecular frame makes the ICT species more stable, and the phenol group less acidic, slowing down the subsequent ESIPT reaction. Our findings bring new insights into the coupling between ICT and ESIPT reactions on the potential-energy surfaces of several barriers.
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Affiliation(s)
- Noemí Alarcos
- Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, and INAMOL, Universidad de Castilla-La Mancha, Avenida Carlos III, S.N., 45071 Toledo, Spain.
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Kumar V, Pandey A, Pandey S. Proton-Transfer Reactions of Acridine in Water-Containing Ionic-Liquid-Rich Mixtures. Chemphyschem 2013; 14:3944-52. [DOI: 10.1002/cphc.201300817] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 09/25/2013] [Indexed: 11/11/2022]
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Kumar V, Pandey S. Selective Quenching of 2-Naphtholate Fluorescence by Imidazolium Ionic Liquids. J Phys Chem B 2012; 116:12030-7. [DOI: 10.1021/jp3080817] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vinod Kumar
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Siddharth Pandey
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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Abou-Kana MTH. Optical, Photophysical, Stability and Mirrorless Lasing Properties of Novel Fluorescein Derivative Dye in Solution. ACTA ACUST UNITED AC 2012. [DOI: 10.4236/ojapps.2012.24034] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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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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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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Balamurali M, Dogra S. Excited state intramolecular proton transfer in 2-(2′-hydroxyphenyl)-1H-imidazo[4,5-c]pyridine: effects of solvents. J Photochem Photobiol A Chem 2002. [DOI: 10.1016/s1010-6030(02)00308-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Santra S, Krishnamoorthy G, Dogra S. Spectral characteristics of the methylated derivatives of 2-(2′-aminophenyl)benzimidazole: effects of solvents. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(00)00684-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Azim S, Ghazy R, Shaheen M, El-Mekawey F. Investigations of energy transfer from some diolefinic laser dyes to Rhodamine 110. J Photochem Photobiol A Chem 2000. [DOI: 10.1016/s1010-6030(00)00231-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Friedrich DM, Wang Z, Joly AG, Peterson KA, Callis PR. Ground-State Proton-Transfer Tautomer of the Salicylate Anion. J Phys Chem A 1999. [DOI: 10.1021/jp990405+] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Naundorf H, Organero JA, Douhal A, Kühn O. Potential energy surface for the proton transfer in 8-hydroxyimidazo[1,2-a]pyridine. J Chem Phys 1999. [DOI: 10.1063/1.479069] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Forés M, Duran M, Solà M, Adamowicz L. Excited-State Intramolecular Proton Transfer and Rotamerism of 2-(2‘-hydroxyvinyl)benzimidazole and 2-(2‘-hydroxyphenyl)imidazole. J Phys Chem A 1999. [DOI: 10.1021/jp9844765] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Forés
- Institut de Química Computacional and Departament de Química, Universitat de Girona, 17071 Girona, Catalonia, Spain, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - M. Duran
- Institut de Química Computacional and Departament de Química, Universitat de Girona, 17071 Girona, Catalonia, Spain, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - M. Solà
- Institut de Química Computacional and Departament de Química, Universitat de Girona, 17071 Girona, Catalonia, Spain, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
| | - L. Adamowicz
- Institut de Química Computacional and Departament de Química, Universitat de Girona, 17071 Girona, Catalonia, Spain, and Department of Chemistry, University of Arizona, Tucson, Arizona 85721
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Santra S, Dogra SK. Excited state intramolecular proton transfer in 2-(2′-aminophenyl) benzimidazole in micelles. J Photochem Photobiol A Chem 1998. [DOI: 10.1016/s1010-6030(98)00269-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Santra S, Dogra SK. Excited-state intramolecular proton transfer in 2-(2′-aminophenyl) benzimidazole. Chem Phys 1998. [DOI: 10.1016/s0301-0104(97)00311-x] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Costela A, Garcia-Moreno I. Phase-conjugate reflection by degenerate four-wave mixing in 2-(2′-hydroxyphenyl)benzimidazole dye solutions: solvent effects. Chem Phys 1996. [DOI: 10.1016/0301-0104(96)00028-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Costela A, Garcia-Moreno I. Degenerate four-wave mixing in phenylbenzimidazole proton-transfer laser dyes. Chem Phys Lett 1996. [DOI: 10.1016/0009-2614(95)01401-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Mosquera M, Penedo JC, Ríos Rodríguez MC, Rodríguez-Prieto F. Photoinduced Inter- and Intramolecular Proton Transfer in Aqueous and Ethanolic Solutions of 2-(2‘-Hydroxyphenyl)benzimidazole: Evidence for Tautomeric and Conformational Equilibria in the Ground State†. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9533638] [Citation(s) in RCA: 154] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Douhal A, Amat-Guerri F, Lillo M, Acuña A. Proton transfer spectroscopy of 2-(2'-hydroxyphenyl)imidazole and 2-(2'-hydroxyphenyl)benzimidazole dyes. J Photochem Photobiol A Chem 1994. [DOI: 10.1016/1010-6030(93)03724-u] [Citation(s) in RCA: 111] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Douhal A, Amat-Guerri F, Acuña A, Yoshihara K. Picosecond vibrational relaxation in the excited-state proton-transfer of 2-(3′-hydroxy-2′-naphthyl)benzimidazole. Chem Phys Lett 1994. [DOI: 10.1016/0009-2614(93)e1426-h] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Douhal A, Lahmani F, Zehnacker-Rentien A. Excited-state intramolecular proton transfer in jet-cooled 1-hydroxy-2-acetonaphthone. Chem Phys 1993. [DOI: 10.1016/0301-0104(93)85087-o] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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28
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Formosinho SJ, Arnaut LG. Excited-state proton transfer reactions II. Intramolecular reactions. J Photochem Photobiol A Chem 1993. [DOI: 10.1016/1010-6030(93)80158-6] [Citation(s) in RCA: 494] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Chou PT, Martinez ML, Clements JH. The observation of solvent-dependent proton-transfer / charge-transfer lasers from 4' -diethylamino-3-hydroxyflavone. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)89175-h] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Acuña A, Amat-Guerri F, Costela A, Douhal A, Figuera J, Florido F, Sastre R. Proton-transfer lasing from solid organic matrices. Chem Phys Lett 1991. [DOI: 10.1016/0009-2614(91)90491-q] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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