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Coordinate bond breaking induced by collapse of PNIPAM as ligands of a rare earth complex
SongTianyu
Author NameAffiliationE-mail
SongTianyu 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, Anhui 230026, P. R. China. songty@mail.ustc.edu.cn 
Abstract:
A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and 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 in the investigation that PNIPAM collapse above the lower critical solution temperature(LCST)causes the coordination bond breaking, leading to weakening of the fluorescence from Eu3+ and enhancing of the fluorescence from the ligands. When temperature decreases, the fluorescence from Eu3+ 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.
Key words:  thermo-responsive polymer, thermal quenching, reversible
FundProject:
Coordinate bond breaking induced by collapse of PNIPAM as ligands of a rare earth complex
SongTianyu
摘要:
A novel water-soluble luminescent complex consisting of Eu(ally-dbm)3-2Tppo and 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 in the investigation that PNIPAM collapse above the lower critical solution temperature(LCST)causes the coordination bond breaking, leading to weakening of the fluorescence from Eu3+ and enhancing of the fluorescence from the ligands. When temperature decreases, the fluorescence from Eu3+ 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.
关键词:  thermo-responsive polymer, thermal quenching, reversible
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