Citation: Hui Min MA, Yue Xian HUANG, Shu Quan LiANG. STERIC EFFECT OF HYDROXY GROUPS ORTHO TO THE AZO-GROUP ON ANALYTICAL BEHAVIOR OF CHROMOGENIC REAGENTS[J]. Chinese Chemical Letters, ;1996, 7(3): 275-278. shu

STERIC EFFECT OF HYDROXY GROUPS ORTHO TO THE AZO-GROUP ON ANALYTICAL BEHAVIOR OF CHROMOGENIC REAGENTS

Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080

Received Date: 19 September 1995

Fund Project: This work was supported by grants from the National Natural Science Foundation of China and our Institute.

Three new azo-reagents having different numbers of hydroxy groups ortho to the azo-group,i.e., 2-(2',4',6'-trihydroxyphenylazo)-, 2-(2',4'-dihydroxyphenylazo)-and 2-(4'-hydroxyphenylazo)benzenearsonic acid,were synthesized.Through comparative studies on the reactions of the three reagents with various metal ions,especially with iron(Ⅲ),it was found that not only selectivities but also sensitivities of azo-reagents can be improved by utilizing rationally the steric effect of groups ortho to the azo-group.The reasons for the improvements were discussed.
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