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 jun 2014
Accepted
30 jul 2014
First published
30 jul 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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