Analytical Sciences

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.

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