The article presents the results of spectroscopic studies of 4-(5-methyl-1,3,4-thiadiazol-2-yl)benzene-1,3-diol (C1) and 4-(5-heptyl-1,3,4-thiadiazol-2-yl)benzene-1,3-diol (C7) in organic solvent solutions. Depending on the concentration of the compound used, three bands were observed in the fluorescence emission spectra of the compounds in DMSO solutions. A single band was observed in methanol, propan-2-ol, or ethanol. The significantly shortened fluorescence lifetimes and the different shapes of circular dichroism (CD) spectra clearly indicate association of the fluorescence effects with the aggregation processes in the analyzed compounds. The differences in the course of the CD spectra also imply an effect of the substituent group structure on the molecule aggregation interactions. Therefore, it has been postulated that the occurrence of the different spectral forms induced by changes in the compound concentration may be related to the aggregation effects of C1 and C7 molecules, which are also induced by differences in the alkyl substituent structure.

中文翻译：

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溶剂对4-（5-庚基-1,3,4-噻二唑-2-基）苯-1,3-二醇和4-（5-甲基-1,3,4-噻二唑-2-的分子聚集的影响yl）苯-1,3-二醇

本文介绍了4-（5-甲基-1,3,4-噻二唑-2-基）苯-1,3-二醇（C1）和4-（5-庚基-1,3，有机溶剂溶液中的4-噻二唑-2-基）苯-1,3-二醇（C7）。根据所用化合物的浓度，在DMSO溶液中化合物的荧光发射光谱中观察到三个谱带。在甲醇，丙-2-醇或乙醇中观察到单个谱带。荧光寿命的显着缩短和圆二色性（CD）光谱的不同形状清楚地表明了所分析化合物中荧光效应与聚集过程的关联。CD光谱过程中的差异还暗示取代基基团结构对分子聚集相互作用的影响。因此，