Indexed by:期刊论文

Date of Publication:2008-04-01

Journal:HELVETICA CHIMICA ACTA

Included Journals:SCIE、EI

Volume:91

Issue:4

Page Number:635-645

ISSN No.:0018-019X

Abstract:A colorimetric sensor for fluoride ions based on a new sensing mechanism is reported. The colorimetric sensor contains an isomerizable enol-keto moiety as the recognition site and phenothiazine as chromogenic center. A color change visible to the naked eye is observed upon addition of fluoride ions to the solution of sensor 1 in aprotic solvents such as CHCl3 and MeCN. The sensor shows no colorimetric response for other halide ions. Enol-keto tautomerization is proposed to be responsible for the anion sensing of 1, based on UV/VlS absorption, H-1-NMR, and single-crystal structure analysis.