Issue 69, 2015

Highly selective colorimetric and fluorescent detection for Hg2+ in aqueous solutions using a dipeptide-based chemosensor

Abstract

A peptidyl chemosensor (1) showed sensitive colorimetric and fluorescent responses to Hg2+ and Ag+ among 16 metal ions in aqueous solutions. 1 detected sensitively Hg2+ and Ag+ by color change with a red shift of the maximum absorbance band at 452 nm; a red color for Hg2+ and an orange color for Ag+. Furthermore, 1 showed a highly selective colorimetric response to Hg2+ among 16 metal ions in aqueous solutions containing NaCl. The selective colorimetric detection of Hg2+ was not interfered by other metal ions. About 2 equiv. of Hg2+ was enough for the saturation of color and fluorescent change of 1 in aqueous solutions. The dissociation constant for Hg2+ was 2.4 × 10−10 M2 (R2 = 0.993) and the detection limit for Hg2+ was 25.6 nM (R2 = 0.994). The binding mode of 1 with Hg2+ ions was proposed on the basis of the results of pH titration experiment, NMR titration experiment, and mass spectrometry.

Graphical abstract: Highly selective colorimetric and fluorescent detection for Hg2+ in aqueous solutions using a dipeptide-based chemosensor

Supplementary files

Article information

Article type
Paper
Submitted
02 Apr 2015
Accepted
11 Jun 2015
First published
11 Jun 2015

RSC Adv., 2015,5, 56356-56361

Author version available

Highly selective colorimetric and fluorescent detection for Hg2+ in aqueous solutions using a dipeptide-based chemosensor

J. Park, B. In and K. Lee, RSC Adv., 2015, 5, 56356 DOI: 10.1039/C5RA05842B

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