对羟基偶氮苯甲醛的合成及其光响应性能研究

Study on the synthesis and photoresponse of p-hydroxyazobenzaldehyde

对氨基苯甲醛、亚硝酸钠在盐酸条件下完成重氮化反应,再与苯酚偶合,生成对羟基偶氮苯甲醛,GC/MS测定产品纯度97.4%。氯仿溶剂中,对羟基偶氮苯甲醛特征吸收波长为359 nm和241 nm,摩尔消光系数分别为23 572,8 270 L/(mol·cm)。在365 nm紫外光照射下,359 nm吸收峰强度逐渐降低,241 nm吸收峰强度逐渐增强,停止紫外照射,则两吸收峰强度逐渐恢复原状,证实对羟基偶氮苯甲醛具备反式构型和顺式构型之间的光致变色特性,其光致变色动力学过程表现为一级反应,速率常数2.99×10-3min-1。

A diazo-reaction were reacted between p-amideazobenzaldehyde and sodium nitrite in the present of hydrochloric acid,the intermediate produced by diazo-reaction was couplied with phenol to give phydroxyazobenzaldehyde. The purity of product is 97. 4% detected by GC / MS. The maximum absorption peaks of the target molecule are 359 nm and 241 nm with their molar extinction coefficient（ ε） are 23 572,8 270 L /（ mol·cm）,respectively. Under irradiation of UV-light（ 365 nm）,the peak 359 nm was decreased gradually,while the other at 241 nm was increased. As soon as the irradiation stopped,both of the peaks recovered to their original shape,which is the evidence that p-hydroxyazobenzaldehyde is photochromic; between the trance and cis isomer. The process of photochrome is a first order reaction with the rate constant of 2. 99 × 10^- 3min^- 1.