Coordinate Bond Breaking Induced by Collapse of Poly(\begin{document}$N$\end{document}-isopropyl acrylamide) as Ligands of a Rare Earth Complex |
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Authors: | Tian-yu Song Yan-yang Zhu Shuo-feng Liang Gang Zou Qi-jin Zhang |
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Affiliation: | CAS Key Laboratory of Soft Matter Chemistry, Key Laboratory of Optoelectronic Science and Technology, Innovation Centre of Chemistry for Energy Materials, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China |
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Abstract: | A novel water-soluble luminescent complex consisting of Eu(ally-dbm)\begin{document}$_3$\end{document}-2Tppo and poly(N-isopropyl acrylamide) (PNIPAM) is synthesized through a series of chemical reactions. The structure of the complex is characterized by TGA, GPC, HNMR, and the thermal-responsive fluorescence of the complex in aqueous solution is investigated. It is found that PNIPAM collapse above the lower critical solution temperature causes the coordination bond breaking, leading to weakening of the fluorescence from Eu\begin{document}$^{3+}$\end{document} and enhancing of the fluorescence from the ligands. When temperature decreases, the fluorescence from Eu\begin{document}$^{3+}$\end{document} is found to boost up and the fluorescence from ligands weakens accordingly. It is deduced from this phenomenon that the ligands re-coordinate with europium ions again along with the temperature decreasing, which is further confirmed by IR measurements. This thermal-responsive fluorescence is of reversibility, which can be used as molecular probes for biological imaging and collapse studying of PNIPAM. |
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Keywords: | Thermo-responsive polymer Thermal quenching Reversiblity |
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