含中氮茚基团的偶氮染料的合成及其吸收光谱

Synthesis of Some Indolizine Derivatives and Their Absorption Spectra

合成了4个新的中氮茚偶氮类化合物,并通过元素分析、红外光谱及核磁共振等测试技术表征了其结构。测定了它们的热稳定性,研究了它们在不同溶剂中以及不同pH值条件下的紫外光谱性质。结果表明,当化合物中的羧基以羧酸负离子存在时出现最大吸收波长蓝移。差热分析显示,2-位烷基取代的化合物分解温度在180℃,2-位苯基取代的化合物相对比较稳定,分解温度在200℃以上。

Four novel azo derivatives of indolizine were synthesized and fully characterized by ^1H and ^13C NMR, FTIR, elemental analysis, and thermal analysis. The behaviour of these diazo dyes in various solvents was evaluated. Substituent, acid and base effects on the visible absorption maxima of the dyes were also reported. The absorption maxima displayed a blue-shift when the compounds were present under ionic condition. DSC curves show that the decomposition temperature for the compound having alkyl substituent at the C-2 position is 180 ℃. 2-Phenyl-substituted compounds are comparatively stable, with a decomposition temperatures above 200 ℃.