A Simple Carbazole-based Schiff Base as Fluorescence "off-on" Probe for Highly Selective Recognition of Cu 2+ in Aqueous Solution

• Published in: Bulletin of the Korean Chemical Society Vol. 35; no. 8; pp. 2326 - 2330
• Main Authors: Tang, Lijun, Wu, Di, Hou, Shuhua, Wen, Xin, Dai, Xin
• Format: Journal Article
• Language: Korean
• Published: 2014
• Subjects: Schiff base; Fluorescent probe; Copper(II) recognition; Carbazole
• ISSN: 0253-2964; 1229-5949

A carbazole-based Schiff base CB2 was synthesized and applied as a highly selective and sensitive fluorescent probe for $Cu^{2+}$ in $H_2O$-DMSO (8/2, v/v, pH = 7.4) solution. CB2 exhibits an excellent selectivity to $Cu^{2+}$ over other examined metal ions with a prominent fluorescence "turn-on" at 475 nm. CB2 and $Cu^{2+}$ forms a 1:2 binding ratio complex with detection limit of $9.5{\mu}M$. In addition, the $Cu^{2+}$ recognition process is hardly interfered by other examined metal ions.