6-取代苯并噻唑偶氮苯甲酸型试剂与铁钴镍铜钯显色的反应

CHROMOGENIC REACTIONS OF 6-SUBSTITUTED-BENZOTHIA-ZOLYLAZOBENZOIC ACIDS WITH IRON COBALT NICKEL COPPER AND PALLADIUM

在显色剂BTAMB的苯并噻唑环的6-位引入不同的取代基,合成-类新显色剂2-[2’-(6’=取代苯并噻唑)-偶氮]-5-二甲氨基苯甲酸(6-R-BTAMB,R=CH_3,OCH_3,Cl,Br,NO_2,CH_3SO_2).研究了在表面活性剂或有机溶剂存在下,新试剂6-R-BTAMB与Fe(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)和Pd(Ⅱ)离子的络合显色反应及其光度分析特性.试验结果表明,引入的R基因明显地影响试剂的络合能力.并从R基因的电子效应等方面讨论了试剂结构与性能之间的关系.

The Different groups were introduced into the 6-position of benzothiazole of reagent BTAMB to form a group of new reagent, 2-[2' -(6' -substituted-benzothiazoly)azo]-5-dimethyl aminobenzoic acids (6-R-BTAMB, R-CH3, OCH3, Cl, Br, NO2,CH3SO2). The spectrophotometric determination of trace amount of Fe(Ⅱ) ,Co(Ⅱ) ,Ni(Ⅱ) ,Cu(Ⅱ) ,and Pd(Ⅱ)ions with 6-R-BTAMB in the presence of surfactants and organic reagents were studied. It is found that the R groups influence the chelat-ing ability of these reagents. The relationship between the electronic effect of these groups and chromogenic properties of these reagents has been studied.