NDLI: Preparation, characterization, and properties of PMMA-doped polymer film materials: a study on the effect of terbium ions on luminescence and lifetime enhancement

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Wang, Yu-lei Fan, Rui-qing Wang, Ping Zhang, Hui-jie Wang, Xin-ming Yang, Yu-lin
Description	Author Affiliation: Zhang HJ ( Department of Chemistry, Harbin Institute of Technology, Harbin 150001, P. R. of China. fanruiqing@hit.edu.cn ylyang@hit.edu.cn.)
Abstract	Poly(methylmethacrylate) (PMMA) doped with Tb-based imidazole derivative coordination polymer $\{[Tb_{3}(L)(μ_{3}-OH)_{7}]·H_{2}O\}_{n}$ (1) (L = N,N′-bis(acetoxy)biimidazole) was synthesized and its photophysical properties were studied. The L′ (L′ = N,N′-bis(ethylacetate)biimidazole) ligand was synthesized by an N-alkylation reaction process followed by ester hydrolysis to produce ligand L. Polymer 1 and ligand L′ have been characterized by $^{1}H$ NMR and IR spectroscopy, elemental analysis, PXRD and X-ray single-crystal diffraction. Coordination polymer 1 is the first observation of a $CdCl_{2}$ structure constructed with hydroxy groups and decorated by ligand L in lanthanide N-heterocyclic coordination polymers. In the 2D layered structure of 1, each Tb3 metal center is connected with three Tb1 and three Tb2 metal centers by seven hydroxyl groups in different directions, resulting in a six-membered ring. After doping, not only the luminescence intensity and lifetime enhanced, but also their thermal stability was increased in comparison with 1. When 1 was doped into poly(methylmethacrylate) (1@PMMA), polymer film materials were formed with the PMMA polymer matrix (w/w = 2.5%–12.5%) acting as a co-sensitizer for $Tb^{3+}$ ions. The luminescence intensity of the $Tb^{3+}$ emission at 544 nm increases when the content of $Tb^{3+}$ was 10%. The lifetime of 1@PMMA (914.88 μs) is more than four times longer than that of 1 (196.24 μs). All τ values for the doped polymer systems are higher than coordination polymer 1, indicating that radiative processes are operative in all the doped polymer films. This is because PMMA coupling with the O–H oscillators from $\{[Tb_{3}(L)(μ_{3}-OH)_{7}]·H_{2}O\}_{n}$ can suppress multiphonon relaxation. According to the variable-temperature luminescence (VT-luminescence) investigation, 1@PMMA was confirmed to be a stable green luminescent polymer film material.
ISSN	14779226
Issue Number	6
Volume Number	44
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-02-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Luminescence Organometallic Compounds Chemistry Polymers Polymethyl Methacrylate Terbium Imidazoles Ions Models, Molecular Molecular Structure Chemical Synthesis Journal Article Research Support, Non-U.S. Gov't
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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