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Wu J, He J, Wang W, Chen X, Xia SH. Excited-state relaxation mechanisms of 2,2'-(1-phenyl-1 H-1,2,4-triazole-3,5-diyl)diphenol: single- or double-proton transfer? Phys Chem Chem Phys 2023; 25:30679-30686. [PMID: 37933753 DOI: 10.1039/d3cp02680a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2023]
Abstract
Triazole compounds are important organic systems with excellent electronic properties, which have diagnostic potential in the fields of organic electronics and organic photovoltaics. The important photophysical nature of these systems is the transformation between the enol and keto forms after excited-state proton transfer. In this study, the IR vibrational spectrum, ESIPT mechanism, and excited-state decay dynamics of 2,2'-(1-phenyl-1H-1,2,4-triazole-3,5-diyl)diphenol (ExPh) were explored using electronic structure calculations and non-adiabatic dynamics simulations. Two S1/S0 conical intersections with distinct proton transfer (ESIPT-I and ESIPT-II) involved were obtained. The associated two-dimensional S1 minimum-energy potential energy surface indicated that the dynamical roles of these two S1/S0 conical intersections in the S1 excited-state decay were quite different. The ESIPT-I reaction was more favorable to occur than the ESIPT-II process. Our dynamics simulations supported this hypothesis with the whole trajectories decaying to the ground state via the S1S0-1 conical intersection, which involved the ESIPT-I process. The ESIPT-Involved efficient deactivation pathway could be partially responsible for the decrease in fluorescence emission. These results and ESIPT mechanisms are helpful for understanding the decay pathways of similar systems.
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Affiliation(s)
- Jiahui Wu
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
| | - Jihuan He
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
| | - Wei Wang
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
| | - Xiaohang Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
| | - Shu-Hua Xia
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China.
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Yi SZ, Li BN, Fu PY, Pan M, Su CY. Interplay of Dual-Proton Transfer Relay to Achieve Full-Color Panel Luminescence in Excited-State Intramolecular Proton Transfer (ESIPT) Fluorophores. ACS APPLIED MATERIALS & INTERFACES 2023; 15:3172-3181. [PMID: 36621007 DOI: 10.1021/acsami.2c20129] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
A new design was applied for the facile synthesis of pure organic photoluminescent molecules with dual excited-state intramolecular proton transfer (ESIPT) sites. In this novel class of emitters, full-color panel emission from blue, green, and yellow to red, including white light, can be achieved in different solvents as modulated by the enol-keto(1st)-keto(2nd) tautomer emissions. A comprehensive transient photophysical study verifies that keto(1st) and keto(2nd) have a precursor (<0.8 ps)-successor (∼20 ps)-relayed absorbance relationship, and then a fast equilibrium between the two is established, resulting in dual emissions in the nanosecond scale (∼1900 ps). Through the research on copper ions' selective PL response, the dual-ESIPT mechanism was further verified; in addition, the study of solid-state PL changes upon the stimulus of organic vapor manifests the potential application sensitivity of the molecules as dual-ESIPT sensors. Theoretical results including reaction potential energy surface analyses manifest the fact that dual-proton transfer goes along a sequential route with a smaller energy barrier, firmly supporting the experimental results. An intrinsic system that undergoes intramolecular double proton relayed transfer is thus established for the achievement of much broadened optical responses and full-color display, providing reference for the design and application of advanced dual-ESIPT optical materials.
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Affiliation(s)
- Shao-Zhe Yi
- Lehn Institute of Functional Materials, MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, 132 East Waihuan Road, Panyu District, Guangzhou 510006, P. R. China
| | - Bao-Ning Li
- School of Chemistry and Chemical Engineering, Yulin University, Yulin 719000, P. R. China
| | - Peng-Yan Fu
- Lehn Institute of Functional Materials, MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, 132 East Waihuan Road, Panyu District, Guangzhou 510006, P. R. China
| | - Mei Pan
- Lehn Institute of Functional Materials, MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, 132 East Waihuan Road, Panyu District, Guangzhou 510006, P. R. China
| | - Cheng-Yong Su
- Lehn Institute of Functional Materials, MOE Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-sen University, 132 East Waihuan Road, Panyu District, Guangzhou 510006, P. R. China
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Wu J, Chen X, Peng LY, Cui G, Xia SH. Excited-State Deactivation Mechanism of 3,5-bis(2-hydroxyphenyl)-1 H-1,2,4-triazole: Electronic Structure Calculations and Nonadiabatic Dynamics Simulations. J Phys Chem A 2022; 126:4002-4012. [PMID: 35730538 DOI: 10.1021/acs.jpca.2c02080] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
3,5-bis(2-Hydroxyphenyl)-1H-1,2,4-triazole (bis-HPTA) has attracted wide attention due to the important application in the detection of microorganisms and insecticidal activity. However, the mechanisms of excited-state intramolecular proton transfer (ESIPT) process and decay pathways are still a matter of debate. In this work, we have comprehensively investigated the photodynamics of bis-HPTA by executing combined electronic structure calculations and nonadiabatic surface-hopping dynamics simulations. Based on the computed electronic structure and dynamics information, we propose two nonadiabatic deactivation channels that efficiently populate the ground state from the Franck-Condon region. In the first one, after being excited to the bright S1 state, bis-HPTA molecule undergoes an ultrafast and barrierless ESIPT-1 process. Then, the system encounters with an energetically accessible S1/S0 conical intersection (CI), which funnels the system to the ground state speedily. Afterward, the keto species either arrives at the keto product or return to its enol species via a ground-state proton transfer in the S0 state. In the other excited-state decay channel, the S1 system hops to the ground state through a different CI, which involves the ESIPT-2 process. In our dynamics simulations, about 79.6% of the trajectories decay to the S0 state via the first CI, while the remaining ones employ the second conical intersection. The results of dynamics simulations also demonstrated that the lifetime of the S1 state is estimated as 315 fs. The present work will give elaborating mechanistic information of similar compounds in various environments.
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Affiliation(s)
- Jiahui Wu
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Xiaohang Chen
- College of Life and Environmental Sciences, Minzu University of China, Beijing 100081, China
| | - Ling-Ya Peng
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Ganglong Cui
- 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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Yang D, Tian Y, Yang W, Zheng R. The regulation mechanism of the excited-state behaviour of 3-Hydroxy-2-(1-ethyl-1H-pyrazol-3-yl)-4H-chromen-4-one fluorophore by solvent polarity: a computational study. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2066580] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Dapeng Yang
- College of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou, People’s Republic of China
| | - Yanshan Tian
- College of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou, People’s Republic of China
| | - Wenpeng Yang
- College of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou, People’s Republic of China
| | - Rui Zheng
- College of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou, People’s Republic of China
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Song L, Meng X, Zhao J, Han H, Zheng D. Excited-state intramolecular double proton transfer mechanism associated with solvent polarity for 9,9-dimethyl-3,6-dihydroxy-2,7-bis(4,5-dihydro-4,4-dimethyl-2-oxazolyl)fluorene compound. Mol Phys 2021. [DOI: 10.1080/00268976.2021.2007307] [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]
Affiliation(s)
- Liying Song
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, People’s Republic of China
| | - Xuan Meng
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, People’s Republic of China
| | - Jinfeng Zhao
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, People’s Republic of China
| | - Haiyun Han
- People's Hospital of Dingtao District, Heze, People’s Republic of China
| | - Daoyuan Zheng
- Institute of Molecular Sciences and Engineering, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao, People’s Republic of China
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