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A helical chain-like organic–inorganic hybrid arsenotungstate with color-tunable photoluminescence

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Abstract

A 1-D infinite helical chain-like organic–inorganic hybrid arsenotungstate Na4H8[{Pr(H2O)2}2{As2W19O68}{WO2(mal)}2]·24H2O (mal = malate) (1) was prepared, which was characterized by elemental analyses, thermogravimetric (TG) analyses, IR spectroscopy, powder X-ray diffraction (PXRD) and X-ray single-crystal diffraction. Structural characterization revealed that 1 comprises the organo-functionalized [{As2W19O68}{WO2(mal)}2]18− polyanions hinged together by the Pr3+ ions forming a 1-D infinite helical chain-like architecture. The malate ligand may play a vital role to stabilize the structure of 1 by the formation of the five-membered W–O–C–C–O chelate ring. Solid state photoluminescence reveals that 1 features excitation wavelength-dependent emission properties, achieving a reversible emission color switching simply via changing the excitation wavelength. Time-resolved emission spectroscopy (TRES) indicates that the photoexcitation O → M ligand to metal charge transfer (LMCT) of arsenotungstate fragments can sensitize the Pr3+ ions through intramolecular energy transitions in 1.

Graphical abstract: A helical chain-like organic–inorganic hybrid arsenotungstate with color-tunable photoluminescence

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Publication details

The article was received on 06 Dec 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7DT04608A
Citation: Dalton Trans., 2018, Advance Article
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    A helical chain-like organic–inorganic hybrid arsenotungstate with color-tunable photoluminescence

    H. Wu, R. Wan, Y. Si, P. Ma, J. Wang and J. Niu, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C7DT04608A

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