Dihydroquinolylazotetrazole dyes: Effect of a substituent at the tetrazole fragment on spectral properties and thermal ‒ isomerization in organic solvents
作者:Tatiana D. Nekipelova、Evgenii N. Khodot、Yulia S. Deeva、Irina I. Levina、Elena N. Timokhina、Alexey A. Kostyukov、Vladimir A. Kuzmin
DOI:10.1016/j.dyepig.2021.109675
日期:2021.11
New hetarylazo dyes with dihydroquinoline and tetrazole moieties with different substituents at the tetrazole cycle were synthesized and their spectral properties and thermal Z‒E isomerization were investigated in toluene, MeCN and DMSO. The substitution of H with the CH3 group at the tetrazole fragment results in the disappearance of concentration dependence of the absorption spectra observed for
合成了在四唑循环中具有不同取代基的二氢喹啉和四唑部分的新型杂芳基偶氮染料,并在甲苯、MeCN和DMSO中研究了它们的光谱性质和热Z-E异构化。在四唑片段处用 CH 3基团取代 H导致在 MeCN 和 DMSO 中观察到的具有未取代四唑的染料的吸收光谱的浓度依赖性消失。MeCN 和 DMSO 中的时间分辨测量结果表明,对于具有未取代四唑的染料,存在多种形式的Z-异构体,其寿命在 μs-ms 时间尺度上,而对于具有 CH 3的染料,则存在单个Z-异构体四唑组。CH 3基团在四唑碎片上的位置影响Z-异构体的寿命,在从2-甲基-到1-甲基-四唑时,它从毫秒变为秒和分钟。讨论了二氢喹啉基偶氮四唑染料的结构特征和与溶剂的络合物形成。