Issue 38, 2014

A boronate hydrogel film containing organized two-component dyes as a multicolor fluorescent sensor for heavy metal ions in water

Abstract

A multicolor fluorescent hydrogel sensor containing two types of fluorescent dyes with an amidoquinoline receptor unit and a rhodamine chromophore covalently incorporated into a polyvinyl alcohol–boronate matrix was prepared. Although the gel film exhibited red emission due to the rhodamine chromophore, the addition of a small amount of Zn2+ ions induced a multicolor fluorescence response, which included white-light emission, of the film in water. The change in emission color is ascribed to fluorescence enhancement of the amidoquinoline moiety upon binding to Zn2+ ions with an association constant of (3.5 ± 0.2) × 105 M−1. In contrast, a negligible change in the emission color of the gel film was observed in the presence of Na+, K+, Mg2+, Ca2+, Fe3+, Co2+, Ni2+, Cu2+, Cd2+, Hg2+, Al3+, and Pb2+ ions. The selectivity of the gel film enabled visual detection of Zn2+ ions in tap water. Moreover, the film could be reused as a sensor strip after treatment with ethylenediaminetetraacetic acid.

Graphical abstract: A boronate hydrogel film containing organized two-component dyes as a multicolor fluorescent sensor for heavy metal ions in water

Supplementary files

Article information

Article type
Paper
Submitted
26 6 2014
Accepted
30 7 2014
First published
30 7 2014

J. Mater. Chem. A, 2014,2, 15846-15852

A boronate hydrogel film containing organized two-component dyes as a multicolor fluorescent sensor for heavy metal ions in water

R. Nishiyabu, S. Ushikubo, Y. Kamiya and Y. Kubo, J. Mater. Chem. A, 2014, 2, 15846 DOI: 10.1039/C4TA03268C

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