Highly selective fluorescent sensing of Cu2+ ion by an arylisoxazole modified calix[4]arene

✍ Scribed by Kai-Chi Chang; Li-Yang Luo; Eric Wei-Guang Diau; Wen-Sheng Chung

• Publisher: Elsevier Science
• Year: 2008
• Tongue: French
• Weight: 319 KB
• Volume: 49
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/j.tetlet.2008.06.060

✦ Synopsis

A novel fluorescent chemosensor 1 with two anthraceneisoxazolymethyl groups at the lower rim of calix[4]arene has been synthesized, which revealed a dual emission (monomer and excimer) when excited at 375 nm. This chemosensor displayed a selective fluorescence quenching only with Cu 2+ ion over all other metal ions examined. When Cu 2+ ion was bound to 1, the fluorescence intensities of both monomer and excimer were quenched. Furthermore, the association constant for the 1:1 complex of 1ÁCu 2+ was determined to be (1.58 ± 0.03) Â 10 4 M À1 .