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合成了3-(2-(5-硝基噻唑)偶氮)-2-氨基-4-羟基吡啶、5-(2-(5-硝基噻唑)偶氮)-8-羟基喹啉、3-(2-(5-硝基噻唑)偶氮)-4-甲基-2-氨基吡啶、3-(2-(5-硝基噻唑)偶氮)-5-甲基-2-氨基吡啶、3-(2-(5-甲基噻唑)偶氮)-2-氨基吡啶、3-(2-(5-甲基噻唑)偶氮)-5-甲基-2-氨基吡啶(以下分别简称为化合物A,化合物B,化合物C,化合物D,化合物E,化合物F),采用IR和1 H-NMR对其结构进行了表征,利用UV-Vis研究了其光致变色的性能。结果显示:化合物A,化合物B,化合物C,化合物D具有较为明显的光致变色的性能。在重氮环上引入吸电子基,而在偶合环上引入供电子基时,有利于共轭体系中电子流动,在520~550nm出现顺式吸收峰,表现出光致变色的性能。化合物E和化合物F的重氮环和偶合环上都引入供电子基,共轭体系中电子流动受阻,没有出现顺式吸收峰,因而不具有光致变色性,重氮环上的取代基的种类对光致变色性能具有重要的影响。
Synthesis of 3- (2- (5-nitrothiazole) azo) -2-amino-4-hydroxypyridine, 5- - (2- (5-nitrothiazole) azo) -4- methyl-2-aminopyridine, 3- 3- (2- (5-methylthiazolyl) azo) -2-aminopyridine, 3- (Compound A, compound B, compound C, compound D, compound E and compound F) were synthesized and characterized by IR and 1 H-NMR. The photochromic properties were studied by UV-Vis. The results show that compound A, compound B, compound C and compound D have obvious photochromic properties. The introduction of electron-withdrawing groups on the diazonium ring and the introduction of electron-donating groups on the coupling ring are favorable for the electron flow in the conjugated system and the cis-absorption peak appears at 520-550 nm, showing photochromic properties. The electron donating groups are introduced to both the diazonium ring and the coupling ring of the compound E and the compound F, and the electron flow in the conjugated system is hindered, the cis-type absorption peak does not appear, and thus the photochromic property The type has a significant effect on photochromic properties.