Synthesis, structural characterization and tautomeric properties of some novel bis-azo dyes derived from 5-arylidene-2,4-thiazolidinone
作者:Asadollah Mohammadi、Mastaneh Safarnejad
DOI:10.1016/j.saa.2014.02.010
日期:2014.5
diazotization-coupling reaction. The structures of the compounds were confirmed by UV-vis, IR, (1)H NMR and (13)C NMR spectroscopic techniques. The spectral characterizations demonstrate that there is an equilibrium between the azo (T1) and hydrazine (T2 and T3) tautomers for all prepared dyes in solutions. In addition, the solvatochromic behavior of the prepared dyes was evaluated using polarity/polarizability
使用Knoevenagel缩合和重氮化偶联反应,分两步合成了9种新的5-亚芳基-2,4-噻唑烷酮衍生的双偶氮染料。化合物的结构通过UV-vis,IR,(1)H NMR和(13)C NMR光谱技术确认。光谱表征表明,溶液中所有制备的染料的偶氮(T1)和肼(T2和T3)互变异构体之间都存在平衡。此外,使用极性/极化率参数(π(*))在各种溶剂中评估了制备的染料的溶剂溶变色行为。染料的UV-vis吸收光谱显示出随着溶剂极性和碱强度的增加而出现红移。最后,报道了酸和碱对重氮组分中具有不同取代基的染料的紫外可见吸收光谱的影响。