首页|Rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW12} with fast-responsive photochromism and switchable luminescence properties

Rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW12} with fast-responsive photochromism and switchable luminescence properties

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Four rare earth inorganic-organic hybrid compounds based on Keggin-type polyoxometalate {SiW12}with general formula[{RE(DMF)4(H2O)4RE(DMF)6}2{SiW12O40}3](RE=La(1),Pr(2),Sm(3),Eu(4),DMF=N,N-dimethylformamide)were synthesized by the conventional solution method.Structure analyses indicate that four compounds are isostructural and are all built from three[SiW12O40]4-pol-yoxoanions and DMF ligands linked by RE3+.Compounds 1-4 are extremely sensitive to UV light and present excellent photochromic properties,in which the coloring and fading time of samples are both no more than 2 min,and the reversible coloring-fading process can be repeated for at least 10 cycles with little fatigue,suggesting that compounds 1-4 can be a series of fast-responsive and durable photo-chromic materials.Moreover,the solid-state photoluminescence spectra of compounds 3(Sm)and 4(Eu)display strong characteristic emissions of rare earth ions based on f-f transitions.Meanwhile,compound 4(Eu)has a longer fluorescence lifetime up to 566.74 μs.Notably,compounds 3(Sm)and 4(Eu)exhibit the switchable luminescence behavior induced by photochromism,which allows them to be used as po-tential molecular switches.

Inorganic-organic hybridKeggin-type polyoxometalatesRare earthsPhotochromismPhotoluminescence

Hong Cui、Yanli Yang、Xue Bai、Xu Han、Wensha Zhang、Ying Lu、Shuxia Liu

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Key Laboratory of Polyoxometalate and Reticular Material Chemistry of the Ministry of Education,College of Chemistry,Northeast Normal University,Changchun 130024,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China

22172022218720212167103321901135

2024

10.1016/j.jre.2022.12.002

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(2)
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