Analytical Sciences

Abstract − Analytical Sciences, 22(12), 1547 (2006).

A Fluorescent Chemosensor for Copper(II) Based on a Carboxylic Acid-functionalized Tris(2,2′-bipyridine)-ruthenium(II) Complex
Chun-Lian HE,*,*** Feng-Lian REN,* Xiao-Bing ZHANG,** Yan-Yan DONG,** and Yan ZHAO**
*College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
**State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, P. R. China
***Medical College, Hunan Normal University, Changsha 410006, P. R. China
In this research, bis(2,2′-bipyridine)(4-methyl-2,2′-bipyridine-4′-carboxylic acid)ruthenium(II)·2PF6- complex (1), was first used as a fluorescent chemosensor to recognize Cu(II) in EtOH/H2O (1:1, v/v) solution. The response of the sensor is based on the fluorescence quenching of complex 1 by binding with Cu(II). The analytical performance characteristics of the proposed Cu(II)-sensitive chemosensor were investigated. The sensor can be applied to the quantification of Cu(II) with a linear range covering from 5.0 × 10-8 to 1.0 × 10-4 M and a detection limit of 4.2 × 10-8 M. The experiment results show that the response behavior of 1 to Cu(II) is pH independent in medium condition (pH 4.0 - 8.0), and show excellent selectivity for Cu(II) over other transition metal cations.