Solvent Effects on Linear and Multi-branched Bithiazole-based Derivatives Fluorescence Studied by Steady-state and Time-resovled Spectroscopy

• Published in: Russian Journal of Physical Chemistry A Vol. 95; no. 8; pp. 1641 - 1645
• Main Authors: Shi, Fuwen, Ni, Minghao, Wang, Zhiquan, He, Nannan, Li, Xiang, Hua, Jianli, Li, Bo, Chen, Ye
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.08.2021; Springer Nature B.V
• Subjects: Charge transfer; Chemical bonds; Chemistry; Chemistry and Materials Science; Doppler effect; Emission analysis; Fluorescence; Molecular structure; Physical Chemistry; Red shift; Room temperature; Solvent effect; Solvents; Spectroscopic analysis; Spectrum analysis; Steady state; Structure of Matter and Quantum Chemistry; time-resolved spectroscopy; solvent effect; ICT
• ISSN: 0036-0244; 1531-863X
• DOI: 10.1134/S0036024421080215

Steady-state absorption, emission, and time-resolved spectroscopy were utilized to study the dynamics of excited states of linear and multi-branched bithiazole derivatives in different solvents at room temperature. In the studied compounds, triphenylamine and bithiazole groups act as donor and acceptor, respectively. BTZ-I and II have similar linear molecular structures, while BTZ-III and BTZ-IV have multi-branched structures. The difference is that the donor and acceptor units are connected by a single bond or a triple bond, respectively. With increase in solvent polarity, the fluorescence spectra exhibit a red shift and the fluorescence lifetime increases. Our results suggest there is intra-molecular charge transfer (ICT) processes in these four samples.