Tetrahedron letters

Selective chromogenic response via regioselective binding of cations: a novel approach in chemosensor design

D Ataman, EU Akkaya

Index: Ataman, Demet; Akkaya, Engin U. Tetrahedron Letters, 2002 , vol. 43, # 22 p. 3981 - 3983

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Citation Number: 15

Abstract

A calixdiquinone bis-indoaniline derivative with two kinds of potential binding sites, discriminates cations according to their charge/size ratio. Harder and highly oxophilic Eu (III) preferentially interacts with the lower rim quinone oxygens; whereas Na (I) binds to the azacrown moieties. As a consequence of the chromogenic sensor's design, these two binding events result in two different responses, Eu (III) causes a remarkable auxochromic ...