Abstract

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.

中文翻译：

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通过稳态和时间分辨光谱研究溶剂对线性和多支链联噻唑基衍生物荧光的影响

摘要

利用稳态吸收、发射和时间分辨光谱研究室温下不同溶剂中线性和多支化联噻唑衍生物的激发态动力学。在研究的化合物中，三苯胺和联噻唑基团分别作为供体和受体。BTZ-I 和 II 具有相似的线性分子结构，而 BTZ-III 和 BTZ-IV 具有多支链结构。不同之处在于供体和受体单元分别通过单键或三键连接。随着溶剂极性的增加，荧光光谱呈现红移，荧光寿命增加。我们的结果表明在这四个样品中存在分子内电荷转移 (ICT) 过程。