A fluorescent chemosensor for Hg2+ based on naphthalimide derivative by fluorescence enhancement in aqueous solution.
Naphthalimide derivative (compound 1) containing hydrophilic hexanoic acid group was synthesized and used to recognize Hg(2+) in aqueous solution. The fluorescence enhancement of 1 is attributed to the formation of a complex between 1 and Hg(2+) by 1:1 complex ratio (K=2.08×10(5)), which has been utilized as the basis of fabrication of the Hg(2+)-sensitive fluorescent chemosensor. The comparison of this method with some other fluorescence methods for the determination of Hg(2+) indicated that the method can be applied in aqueous solution rather than organic solution. 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 covering from 2.57×10(-7) to 9.27×10(-5) M and a detection limit of 4.93×10(-8) M. The experiment results show that the response behavior of 1 toward Hg(2+) is pH independent in medium condition (pH 4.0-8.0). 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 determination of Hg(2+) in hair samples with satisfactory results, which further demonstrates its value of practical applications.
Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, PR China. lichunyan79@sina.com
Chun-Yan
CY
Li
Fen
F
Xu
Yong-Fei
YF
Li
Kai
K
Zhou
Yu
Y
Zhou
D002413:Cations, Divalent / Q000032:analysis*; D005456:Fluorescent Dyes / Q000737:chemistry*; D057230:Limit of Detection; D008628:Mercury / Q000032:analysis*; D053644:Naphthalimides / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013050:Spectrometry, Fluorescence / Q000379:methods*
D002413:Cations, Divalent; D005456:Fluorescent Dyes; D053644:Naphthalimides; D008628:Mercury