Water‐Soluble Luminescent Hybrid Composites Consisting of Oligosilsesquioxanes and Lanthanide Complexes and their Sensing Ability for Cu2+ |
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Authors: | Qianqian Xu Dr Zhiqiang Li Prof Dr Huanrong Li |
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Affiliation: | School of Chemical Engineering and Technology, Hebei University of Technology, Tianjin, P. R. China |
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Abstract: | Water‐soluble hybrid composites with great potential for selective and sensitive sensing and that are obtained through simple, rapid, and environmentally friendly methods are highly desirable and remain a challenging task. Herein, we present luminescent hybrid composites that were realized by linking Na3Ln(dpa)3] (dpa=2,6‐pyridinedicarboxylic acid) to octa‐amino functionalized polyhedral oligomeric silsesquioxane (POSS‐NH2) through hydrogen‐bonding interactions between the oxygen atoms of the carboxylate groups of dpa and the hydrogen‐bond‐donor amino groups. The resulting hybrid composites Ln(dpa)3@POSS‐NH2 are highly soluble in aqueous solutions and the quantum yield of Eu(dpa)3@POSS‐NH2 is as high as 56.5 % or 46.3 % in the solid state and in aqueous solution, respectively, as determined by using the integrating sphere method. The novel water‐soluble luminescent hybrid composites exhibit high thermal and photostability, and the emitted colors of the resulting hybrid composite can be finely tuned by changing the Eu3+/Tb3+ ratio. Interestingly, Eu(dpa)3@POSS‐NH2 hybrid composites exhibited an effective switch‐off fluorescence response to Cu2+ over other common metal ions in aqueous media. |
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Keywords: | Cu2+ detection hydrogen-bonding interactions luminescence polyhedral oligomeric silsesquioxane water-soluble hybrids |
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