对羟基偶氮苯甲酸的合成及光致变色性能研究

Study on the Synthesis and Photoresponse of p-Hydroxyazobenzoic Acid

研究对羟基偶氮苯甲酸(PHABA)的合成方法及其光响应性能。在低温盐酸条件下,完成对氨基苯甲酸与亚硝酸钠的重氮化反应,再与苯酚pH=9条件下完成偶合反应,产品收率82.6%。氯仿溶剂中,PHABA特征吸收波长为357 nm和240 nm,紫外光照射实验显示,PHABA具备动力学一级反应特征的顺反异构光致变色特性,速率常数为7.46×10-4 min-1。

The synthesis and photoresponse of p-hydroxyazobenzoic acid （PHABA） were studied. A diazo-reaction were proceeded between p-amideazobenzoic acid and sodium nitrite in the present of hydrochloric acid at lower temperature. The intermidiate produced by diazo-reaction was couplied with phenol （pH=9） to give PHABA with the yield of 82.6 %. The maximum absorption peaks of the target molecule are at 357 nm and 240 nm in CHCI3. Under irradiation of UV-light, PHABA exhibit sphotochromic between the trance and cis isomer. The process of photochrome is a first order reaction with the rate constant of 7.46× 10-4 min-m.