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. 2007 Aug 16;9(17):3363-6.
doi: 10.1021/ol071337+. Epub 2007 Jul 25.

Triazole-modified calix[4]crown as a novel fluorescent on-off switchable chemosensor

Kai-Chi Chang  1 , In-Hao Su, Annamalai Senthilvelan, Wen-Sheng Chung
Affiliations

Triazole-modified calix[4]crown as a novel fluorescent on-off switchable chemosensor

Kai-Chi Chang et al. Org Lett. .

Abstract

A novel fluorescent on-off switchable chemosensor 1 with two different types of cationic binding sites is synthesized, which is composed of a triazole-modified calix[4]crown in the 1,3-alternate conformation. Among 15 metal ions examined, the fluorescence of 1 was strongly quenched by Hg2+, Cu2+, Cr3+, and Pb2+; however, the revival of emission from the strongly quenched 1.Pb2+ complex was achievable by the addition of K+, Ba2+, or Zn2+ ions. Thus, metal ion exchange can trigger an on-off switchable fluorescent chemosensor.

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