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Xie, Junhan; Wang, Ziyu; Zhu, Ruixue; Jiang, Jiaming; Weng, Tsu-Chien; Ren, Yi; Han, Shuhua; Huang, Yifan; Liu, Weimin
International journal of molecular sciences, 05/2023, Letnik: 24, Številka: 11Journal Article
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 Cu 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.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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