Binding properties of p-(phenylazo)calixarenes for metal ions

Article abstract of DOI:10.1246/bcsj.66.3797

The binding properties of p-(phenylzao)calis[n]arenes (n=6 and n=4) for metal ions have been studied. The calixarenes show a highly selective binding ability toward Ag⁺, Hg⁺, and Hg²⁺. This property can be explained in terms of a metal ion-induced azo/hydrazone tautomerism. The Ag⁺ ion forms complexes with the azocalixarenes by binding with their hydrazone tautomers.