Highly luminescent hydrogels synthesized by covalent grafting of lanthanide complexes onto PNIPAM via one-pot free radical polymerization

被引:60
作者
Li, Qing-Feng [1 ]
Du, Xiaodi [1 ]
Jin, Lin [1 ]
Hou, Mengmeng [1 ]
Wang, Zhenling [1 ]
Hao, Jianhua [2 ]
机构
[1] Zhoukou Normal Univ, Key Lab Rare Earth Funct Mat & Applicat, Zhoukou 466001, Henan, Peoples R China
[2] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong, Hong Kong, Peoples R China
基金
中国国家自然科学基金;
关键词
WATER-SOLUBLE TB3+; PHOTOPHYSICAL PROPERTIES; HYBRID HYDROGELS; ENERGY-TRANSFER; EU3+ COMPLEXES; TERBIUM(III); LIGANDS; SILICA; IONS; ACID;
D O I
10.1039/c6tc00336b
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Highly luminescent PNIPAM-Ln(DPA)(3) hydrogels have been synthesized by one-pot free radical polymerization in aqueous systems at room temperature. We firstly synthesized a bifunctional chelating ligand named as 4-vinylpyridine-2,6-dicarboxylic acid (4-VDPA), which contains two different moieties: (1) a pyridine-2,6-dicarboxylic acid (DPA) moiety that can sensitize the luminescence of Tb3+ and Eu3+ and (2) a reaction functional group that can be polymerized by free radical initiation. Therefore, the luminescent lanthanide complexes can be grafted onto the hydrogel matrix via one-pot free radical polymerization of [Ln(4-VDPA)(3)](3-) , N-isopropylacrylamide (NIPAM) and N,N'-methylenebis(2-propenamide) (MBA). The results indicated that the final hydrogels possess bright luminescence, long luminescence lifetimes and high quantum efficiency. Moreover, the emission colors of the hydrogels can be tuned from red, reddish orange, orange-yellow, yellow, and green by varying the molar ratio of added Eu3+ to Tb3+.
引用
收藏
页码:3195 / 3201
页数:7
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