新试剂1-羟基-2-(6-溴-2-苯并噻唑偶氮)-8-氨基-3,6-萘二磺酸的合成及性能的研究

A new benzothiazolylazo reagent——Synthesis and properties of 1-hydroxy-2-(6-bromo-2-benzothiazolylazo)-8-aminonaphthalene-3,6-disulfonic acid

新苯并噻唑偶氮试剂——1-羟基-2-(6-溴-2-苯并噻唑偶氮)-8-氨基-3,6-萘二磺酸的合成方法简单,提纯容易,产率达73%。试剂的 pK_(a_3)为6.75。是一个变色敏锐的酸碱指示剂,也可用作 Cu^(2+)、Co^(2+)、Ni^(2+)等金属离子的显色剂。

The paper reports a method of synthesis for a newbenzothiazolylazo reagents——1-hydroxy-2-(6-bromo-2-benzothiazolylazo)-8-aminonaphthalene-3,6-disulfo-nic acid and the results of studies on its properties.The method of synthesis is simple.The purification iseasy and the yield is up to 73%.The pK_(a_3) value of thereagent is 6.75 and the reagent is an acid-base indica-tor with sharp colour change.This reagent can also beused as a colour reagent for Cu^(2+),Co^(2+),Ni^(2+) and othermetallic inos.