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

Ataman D., Akkaya E.

TETRAHEDRON LETTERS, vol.43, no.22, pp.3981-3983, 2002 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 43 Issue: 22
  • Publication Date: 2002
  • Doi Number: 10.1016/s0040-4039(02)00725-6
  • Journal Name: TETRAHEDRON LETTERS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.3981-3983
  • Middle East Technical University Affiliated: No

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 change, but Na(I) produces a significant anti-auxochromic effect. (C) 2002 Elsevier Science Ltd. All rights reserved.