Journal
EUROPEAN POLYMER JOURNAL
Volume 141, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2020.110078
Keywords
Rare earth coordination polymer; Carboxyl-functionalized poly(arylene ether nitrile); Synergistic effect; Fluorescence enhancement
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Funding
- National Natural Science Foundation of China [51603027]
- Natural Science Foundation of Chongqing [cstc2018jcyjAX0565]
- Project of Science and Technology Research Program of Chongqing Education Commission of China [KJZD-M201901101]
- Innovation Research Group at Institutions of Higher Education in Chongqing [CXQT 19027]
- postgraduate tutor team project of polymer materials engineering of Chongqing Education Commission
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A series of novel rare earth coordination polymers were synthesized using carboxyl-functionalized poly(arylene ether nitrile) (CPEN) as a macromolecular ligand, europium and terbium ions as central ions, and 1,10-phenanthroline (Phen) as a small-molecule coligand. The experimental results confirmed that the rare earth ions were simultaneously coordinated with the carboxyl groups of CPEN and Phen in the ternary coordination polymers. It was worth noting that the fluorescence intensity of the ternary coordination polymers was greatly enhanced by the synergistic coordination of CPEN and Phen, which benefited from the efficient energy transfer from CPEN and Phen ligands to rare earth ions. Furthermore, it was found that the fluorescence intensity increased with increasing Eu3+ ion content in ternary coordination polymer, and the critical Eu3+ ion concentration when fluorescence quenching occurred was as high as 11.5 wt%. As a result, the ternary coordination polymers exhibit intense, characteristic red (Eu3+) and green (Tb3+) emission under UV excitation both in the powder and film state. In addition, the rare earth coordination polymers showed a high glass transition temperature (251 degrees C) and high thermal stability, offering great potential applications as light-emitting devices, fluorescence detectors and sensors in special environments (e.g., high-temperature environment, extreme environments).
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