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Tulyabaev AR, Khuzin AA, Lukmanov TI, Sabirov DS. Is this how bromine spiropyran salt is converted to merocyanine under UV irradiation? A look through the prism of quantum chemical calculations. Phys Chem Chem Phys 2024; 26:10336-10342. [PMID: 38501209 DOI: 10.1039/d3cp06322d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/20/2024]
Abstract
The stability of merocyanine forms formed under UV irradiation of a solution of a spiropyran salt, in which an organic part acts as a cation and a compact bromide ion as an anion, their photophysical properties, and the formation mechanism are studied in this work using time-dependent density functional theory. Theoretical calculations show that TTC and CTT are the most stable open forms (the difference in stability energies is 10.5 and 12.0 kcal mol-1 relative to the formation energy of spiropyran, respectively). The simulated absorption bands in the UV spectrum of the merocyanine forms are observed both in the UV region at 308-366 nm and in the visible region at 544-757 nm due to n → π* and π → π* type transitions. We found that the isomerisation mechanism of spiropyran into merocyanine forms includes two key stages: the ring opening to form cisoid merocyanine forms (except unstable TCC) through conical intersection and their subsequent isomerisation to form stable transoid isomers. The length of the Cspiro-O bond is 1.97 Å and the C1'-C2'-C3'-C4' angle is 70° in the structure close to conical intersection. The stage that determines the rate of this process is the isomerisation between transoid forms, as in the case of transformation of open merocyanine forms into spiropyran.
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Affiliation(s)
- Arthur R Tulyabaev
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre, Russian Academy of Sciences, 141 Prospekt Oktyabrya, Ufa, Russia.
| | - Artur A Khuzin
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre, Russian Academy of Sciences, 141 Prospekt Oktyabrya, Ufa, Russia.
| | - Timur I Lukmanov
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre, Russian Academy of Sciences, 141 Prospekt Oktyabrya, Ufa, Russia.
| | - Denis Sh Sabirov
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Centre, Russian Academy of Sciences, 141 Prospekt Oktyabrya, Ufa, Russia.
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Chen X, Zhang X, Han J, Xia SH. Photochemical Mechanisms of Hydroxyquinoline Benzimidazole: Insights from Electronic Structure Calculations and Nonadiabatic Dynamics Simulations. J Phys Chem A 2024; 128:1984-1992. [PMID: 38446415 DOI: 10.1021/acs.jpca.3c07298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
Excited-state intramolecular double proton transfer (ESIDPT) has received much attention because of its widespread existence in the life reactions of living organisms, and materials with this property are significant for their special luminescent properties. In this work, the complete active space self-consistent field (CASSCF) and OM2/multireference configuration interaction (OM2/MRCI) methods have been employed to study the static electronic structure calculations of the photochemistry and the possibility of ESIDPT process of hydroxyquinoline benzimidazole (HQB) molecule, along with the nonadiabatic dynamics simulations. The computational results show that the HQB molecule is relaxed to the S1-ENOL minimum after being excited to the Franck-Condon point in the S1 state. Subsequently, during the nonadiabatic deactivation process, the OH···N proton transfer and the twisting of benzimidazole occur before arriving at the single proton transfer conical intersection S1S0-KETO. Finally, the system can either return to the initial ground-state structure S0-ENOL or to the single proton transfer ground-state structure S0-KETO, both of which have almost the same probability. The dynamics simulations also show that no double proton transfer occurs. The excited-state lifetime of HQB is fitted to 1.1 ps, and only 64% of the dynamic trajectories return to the ground state within the 2.0 ps simulation time. We hope the detailed reaction mechanism of the HQB molecule will provide new insights into similar systems.
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Affiliation(s)
- Xiaohang Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - XinYu Zhang
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Juan Han
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Shu-Hua Xia
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
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Lv M, Gao Y, Cai Z, Tang Z, Zhang Y, Wang T, Li W. Theoretical study based on the excited state dynamical of an oxadiazole derivative: A novel fluorescence mechanism. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 302:123011. [PMID: 37418901 DOI: 10.1016/j.saa.2023.123011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/15/2023] [Accepted: 06/10/2023] [Indexed: 07/09/2023]
Abstract
Excited intramolecular proton transfer (ESIPT) has been widely studied as a model system for proton transfer. In recent years, materials and biological systems containing two proton transfers have received special attention from researchers. In this work, the excited state intramolecular double-proton-transfer (ESIDPT) mechanism of a fluorescent compound based on an oxadiazole derivative, 2,5-bis-[5-(4-tert-butyl-phenyl)-[1,3,4]oxadiazol-2-yl]-benzene-1,4-diol (DOX), has been comprehensively investigated through theoretical calculations. The potential energy surface curve of the reaction shows that ESIDPT can occur in the first excited state. This work proposes a new and reasonable fluorescence mechanism based on previous experiments, which has theoretical significance for the future research of DOX compounds in biomedicine and optoelectronics.
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Affiliation(s)
- Meiheng Lv
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China; State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Yue Gao
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Zexu Cai
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Zhe Tang
- Life and Health Intelligent Research Institute, Tianjin University of Technology, Tianjin 300384, PR China
| | - Yuhang Zhang
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Tingting Wang
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Wenze Li
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China.
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Lv M, Gao Y, Cai Z, Tang Z, Zhang Y, Wang T, Li W. A theoretical study on the excited state behavior of a series of novel triazole pyrimidine group fluorophores: ESIPT or ICT. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 297:122706. [PMID: 37054571 DOI: 10.1016/j.saa.2023.122706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 03/30/2023] [Accepted: 04/02/2023] [Indexed: 05/14/2023]
Abstract
Fluoropurine analogues are a kind of unnatural bases, which are widely used in chemistry, biological science, pharmacy and other fields. At the same time, fluoropurine analogues of aza-heterocycles play an important role in medicinals research and development. In this work, the excited state behavior of a group of newly developed fluoropurine analogues of aza-heterocycles, triazole pyrimidinyl fluorophores, was comprehensively studied. The reaction energy profiles indicate that excited state intramolecular proton transfer (ESIPT) is difficult to happen, which is further proved by fluorescent spectra results. This work proposed a new and reasonable fluorescence mechanism based on the original experiment, and found that the large Stokes shift of the triazole pyrimidine fluorophore is due to the intramolecular charge transfer (ICT) process of the excited state. Our new discovery is of great significance for the application of this group of fluorescent compounds in other fields and the regulation of fluorescence properties.
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Affiliation(s)
- Meiheng Lv
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China; State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
| | - Yue Gao
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Zexu Cai
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Zhe Tang
- Life and Health Intelligent Research Institute, Tianjin University of Technology, Tianjin 300384, PR China
| | - Yuhang Zhang
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Tingting Wang
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China
| | - Wenze Li
- College of Science, Shenyang University of Chemical Technology, Shenyang 110142, PR China.
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Understanding the photodynamics of 3-hydroxypyran-4-one using surface hopping simulations. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Shi L, Yang D. The alkoxylation effects on the excited‐state intramolecular proton transfer behaviors for 2,6‐bis(benzothiazolyl‐2‐yl)phenol fluorophore: A theoretical research. J PHYS ORG CHEM 2022. [DOI: 10.1002/poc.4341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lijuan Shi
- Division of General Education Zhongyuan Institute of Science and Technology Zhengzhou China
| | - Dapeng Yang
- College of Physics and Electronics North China University of Water Resources and Electric Power Zhengzhou China
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Yang D, Yang W, Tian Y, Zheng R. Regulating the excited state behaviors of 2-benzooxazol-2-yl-4,6-di-tert-butyl-phenol fluorophore by solvent polarity: a theoretical simulation. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111513] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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