A Fluorescent Chemosensor for Hg2+ Based on a Rhodamine Derivative in an Aqueous Solution

Abstract

In this paper, we unveil a novel rhodamine compound-based fluorescent chemosensor (compound 1) for fluorescent detection of Hg(2+) in an aqueous solution. The fluorescence enhancement of compound 1 was attributed to the formation of a complex between compound 1 and Hg(2+) by 1:1 complex ration (K = 8.0 × 10(4)), which has been utilized as the basis of fabrication of the Hg(2+)-sensitive chemosensor. A comparison of this method with some other fluorescence methods for the determination of Hg(2+) indicated that this method has high selectivity and good water solubility. The analytical performance characteristics of the proposed Hg(2+)-sensitive chemosensor were investigated. The chemosensor can be applied to the quantification of Hg(2+) with a linear range from 6.6 × 10(-7) to 2.4 × 10(-4) M and a detection limit of 1.3 × 10(-7) M. The experiment results show that the response behavior of compound 1 towards Hg(2+) is pH independent in neutral conditions (pH 5.0-9.0). Most importantly, the fluorescence changes of the chemosensor are remarkably specific for Hg(2+) in the presence of other metal ions, which meet the selective requirements for practical application. Moreover, the response of the chemosensor toward Hg(2+) is fast (response time less than 1 min). In addition, the chemosensor has been used for the determination of Hg(2+) in river water samples with satisfactory results.

Fabrication of Water-soluble Fluorescent Polymeric Micelles for Selective Detection of Hg2+ in Blood Serum

“…[20][21][22][23] To date, many fluorescent sensors for Hg 2+ have been reported. [24][25][26][27][28][29][30][31][32] However, many of these sensors are small molecules, which can only work in organic or mixed solvents, may restrict their applications in the environmental or biorelated fields due to their low water solubility and high toxicity. 33,34 To overcome these limitations, polymeric micellesbased sensors have recently attracted considerable interest owing to their excellent properties, including improved water solubility and longer in vivo circulation times, effective distribution of fluorescent dyes, etc.…”