4-甲醛基重氮氨基偶氮苯的合成及其与铜显色反应的研究

Synthesis of 4-Formyl Diazoaminoazobenzene and Colour Reaction with Copper(Ⅱ)

合成一种三氮烯类显色剂 ４甲醛基重氮氨基偶氮苯，并研究与铜（Ⅱ） 的显色反应，建立测定铜（Ⅱ） 的新分光光度法．试验结果表明：在乳化剂ＯＰ存在的条件下，于ｐＨ１０．７０ 的Ｎａ２Ｂ４Ｏ７·１０Ｈ２ＯＮａＯＨ缓冲体系中，试剂与铜（Ⅱ） 形成１∶１ 的桔红色络合物．络合物的最大吸收峰在５００ ｎｍ 处，显色反应的表观摩尔吸光系数为７ ．３９ ×１０４ Ｌ·ｍｏｌ－ １·ｃｍ － １ ，Ｃｕ（Ⅱ）量在０ ～３２０ μｇ·Ｌ－ １ 范围内符合比耳定律．此方法用于茶叶和大米中微量铜的测定．

In this paper a new reagent 4\|formyl diazoaminoazobenzene has been designed and synthesised. In the presence of emulsifier OP and in a buffer solution of Na\-2B\-4O\-7\510H\-2O\|NaOH (pH10.70),copper(Ⅱ) and 4\|formyl diazoaminoazobenzene formed a complex. Its apparent molar absorptivity is 7.39×10\+4 L\5mol\+\{-1\}\5cm\+\{-1\}.The maximum absorbance is at 500 nm. Beer's law is obeyed in the range of 0～320 μg\5L\+\{-1\} for copper(Ⅱ). The method has been applied to the determination of copper in tea and rice.