Issue 6, 2015

Bipyridine hydrogel for selective and visible detection and absorption of Cd2+

Abstract

Herein, we report for the first time the use of bipyridine-based hydrogel for selective and visible detection and absorption of Cd2+. At low concentrations, hydrogelator 1 was applied for selective detection of Cd2+in vitro and in living cells with high sensitivity. In the absence of metal ions, 1 is nonfluorescent at 470 nm. Upon addition of metal ions, 1 selectively coordinates to Cd2+, causing an 86-fold increase of fluorescence intensity at 470 nm via the chelation enhanced fluorescence (CHEF) effect, as revealed by first-principles simulations. At 1.5 wt% and pH 5.5, 1 self-assembles into nanofibers to form hydrogel Gel I. Since Cd2+ could actively participate in the hydrogelation and promote the self-assembly, we also successfully applied Gel I for visible detection and absorption of Cd2+. With these excellent properties, Gel I is expected to be explored as one type of versatile biomaterial for not only environmental monitoring but also for pollution treatment in the near future.

Graphical abstract: Bipyridine hydrogel for selective and visible detection and absorption of Cd2+

Supplementary files

Article information

Article type
Paper
Submitted
03 Nov 2014
Accepted
31 Dec 2014
First published
05 Jan 2015

Nanoscale, 2015,7, 2797-2804

Author version available

Bipyridine hydrogel for selective and visible detection and absorption of Cd2+

Q. Miao, Z. Wu, Z. Hai, C. Tao, Q. Yuan, Y. Gong, Y. Guan, J. Jiang and G. Liang, Nanoscale, 2015, 7, 2797 DOI: 10.1039/C4NR06467D

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