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合成出含杂环的席夫碱类化合物2-羟基-1-萘醛缩2-氨基-4-甲基吡啶,通过元素分析、核磁共振氢谱、红外光谱等表征了其结构。借助差示扫描量热技术、原位升温红外、紫外-可见吸收光谱等研究了其热色性能,探讨了变色的机理,并对变色前后以及恢复原色后的化合物的结构之间的关系进行了研究,此外标题化合物在甲苯溶液中也显示出热色性。结果表明:此类席夫碱是由于邻羟基的存在而导致热色性,恢复原色后与原化合物的结构一致,这也是其热色性具有高重复性的原因。
The structure of heterocyclic Schiff base 2-hydroxy-1-naphthraldehyde 2-amino-4-methylpyridine was synthesized and its structure was characterized by elemental analysis, 1H-NMR and IR spectra. The thermochromism was studied by differential scanning calorimetry (DSC), in-situ infrared spectroscopy (IR) and UV-Vis absorption spectroscopy. The mechanism of discoloration was also discussed. The relationship between the structure of the compound before and after the color change and the original color In addition, the title compound also showed thermochromism in toluene solution. The results show that the Schiff bases are thermochromic due to the presence of ortho-hydroxyl groups, which is the same as that of the original compound after the primary color is restored. This is also the reason for its high thermochromism.