Triazole-Modified Calix[4]crown as a Novel Fluorescent On−Off Switchable Chemosensor

Triazole-Modified Calix[4]crown as a Novel Fluorescent On−Off Switchable Chemosensor

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+, Cr...

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Veröffentlicht in:Organic letters 2007-08, Vol.9 (17), p.3363-3366
Hauptverfasser: Chang, Kai-Chi, Su, In-Hao, Senthilvelan, Annamalai, Chung, Wen-Sheng
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container_issue 17
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container_title Organic letters
container_volume 9
creator Chang, Kai-Chi
Su, In-Hao
Senthilvelan, Annamalai
Chung, Wen-Sheng
description 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.
doi_str_mv 10.1021/ol071337+
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title Triazole-Modified Calix[4]crown as a Novel Fluorescent On−Off Switchable Chemosensor
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