Abstract
A novel design strategy has been applied to fabricate thermo-sensitive silica based lanthanide luminescent hydrogels (poly(N-isopropylacrylamide)), which possesses intense luminescence and exhibits host-guest interactions with anions. In detail, 2-(2-furyl)-4,5-imidazoledicarboxylic acid (a) was used as sensitizing ligand, which could not only transfer its energy to europium ion but also to terbium ion effectively. We observed that only HSO4 − can give rise to fluorescence quenching to these target materials compared with CH3COO−, F−, Cl−, Br−, and I−. We regarded that it was mainly due to the anion's acidity which resulted the turned-off process. More importantly, the emission intensities of the two hydrogels significantly enhanced at lower critical solution temperature (33°C).[Supplementary materials are available for this article. Go to the Publisher's online edition of Soft Materials for the following free supplemental resource(s): Supporting information.]
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