【摘要】 测定了七个吡啶酮系偶氮染料的¹³C NMR波谱.借助于选择性非灵敏核极化转移增强法（SELINEPT）完成了谱带归属。从pH值对¹³C化学位移的影响,¹H NMR谱和紫外-可见吸收光谱,指出这类染料的酸-碱变色现象是由腙式和偶氮式构型互变平衡的移动引起的.介质酸性或碱性的增强分别有利于染料以腙式或偶氮式的构型存在.不同结构的吡啶酮染料,其变色pH值是相当不同的.更多还原

【Abstract】 The 13C NMR spectra of seven azo dyes derived from pyridones were measured. The assignment of the peaks was carried out with the aid of Selective Insensitive Nuclear Enhanced by Polarization Transfer technique ( SELINEPT). It has been pointed out that the phenomenon of colour-change caused by acid-base is due to the shift of equilibrium in hydrazone-azo tautomerism according to the influence of pH values upon 13C chemical shifts, 1H NMR spectra and UV-VIS absorption spectra. The enhancement of acidity and basicity is in favour of hydrazone and azo forms respectively. The different structures of the pyridone dyes change their colour at quite different pH values.更多还原