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Excited‐state proton transfer via higher excited state in 2‐mercaptobenzothiazole: Absorption, fluorescence, Raman spectroscopic study, and theoretical calculation
Author(s) -
Wei Xin,
Duan Aimin,
Deng Yaoliang,
Xue Jiadan,
Zheng Xuming,
Zhao Yanying
Publication year - 2020
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5753
Subject(s) - density functional theory , excited state , chemistry , raman spectroscopy , photochemistry , intermolecular force , hydrogen bond , proton , dimer , fluorescence , solvent , solvent effects , absorption (acoustics) , absorption spectroscopy , molecule , computational chemistry , materials science , atomic physics , organic chemistry , physics , quantum mechanics , optics , composite material
Excited‐state proton transfer (ESPT) photochemical reactions are attracting increasing attention because of their many applications in materials science and biology. 2‐Mercaptobenzothiazole (MBT) is investigated in solid, protic, and aprotic solvents using vibrational and electronic spectroscopies combined with density functional theory (DFT). The presence of the stable dimer conformer in the solid and solvents was confirmed by vibrational spectroscopy. Steady‐state absorption and fluorescence emission spectra of MBT in different pH solvent environments indicate that the intermolecular hydrogen bonding may reveal important insights into the ESPT mechanisms involving single and double proton transfers. With the aid of DFT and time‐dependent density functional theory calculations, we assigned the observed Raman spectra to the dimer in water and methanol solvents and carried out preliminary investigations into the effect of hydrogen bonding with the solvent on the excited‐state proton transfer process.