Investigation of Excited-State Intramolecular Proton Transfer and Structural Dynamics in Bis-Benzimidazole Derivative (BBM)
Autor: | Junhan Xie, Ziyu Wang, Ruixue Zhu, Jiaming Jiang, Tsu-Chien Weng, Yi Ren, Shuhua Han, Yifan Huang, Weimin Liu |
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Jazyk: | angličtina |
Rok vydání: | 2023 |
Předmět: |
Inorganic Chemistry
Organic Chemistry General Medicine Physical and Theoretical Chemistry excited-state intramolecular proton transfer structural dynamics transient absorption femtosecond fluorescence upconversion femtosecond stimulated Raman spectroscopy Molecular Biology Spectroscopy Catalysis Computer Science Applications |
Zdroj: | International Journal of Molecular Sciences; Volume 24; Issue 11; Pages: 9438 |
ISSN: | 1422-0067 |
DOI: | 10.3390/ijms24119438 |
Popis: | The bis-benzimidazole derivative (BBM) molecule, consisting of two 2-(2′-hydroxyphenyl) benzimidazole (HBI) halves, has been synthesized and successfully utilized as a ratiometric fluorescence sensor for the sensitive detection of Cu2+ based on enol–keto excited-state intramolecular proton transfer (ESIPT). In this study, we strategically implement femtosecond stimulated Raman spectroscopy and several time-resolved electronic spectroscopies, aided by quantum chemical calculations to investigate the detailed primary photodynamics of the BBM molecule. The results demonstrate that the ESIPT from BBM-enol* to BBM-keto* was observed in only one of the HBI halves with a time constant of 300 fs; after that, the rotation of the dihedral angle between the two HBI halves generated a planarized BBM-keto* isomer in 3 ps, leading to a dynamic redshift of BBM-keto* emission. |
Databáze: | OpenAIRE |
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