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Issue 36, 2019
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Synthesis, characterization, and photoluminescence properties of three two-dimensional lanthanide-containing Dawson-type polyoxometalates

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Abstract

Three [α2-P2W17O61]10−-based lanthanide-containing polyoxometalates (LCPs) [N(CH3)4]3H8{Ln(H2O)7[Ln(H2O)3Ln(H2O)42-P2W17O61)2]}·48H2O [Ln = La3+ (1), Ce3+ (2), and Pr3+ (3)] were successfully obtained by the reaction of a trivacant Dawson-type precursor [P2W15O56]12− and lanthanide ions under hydrothermal conditions. The compounds 1–3 were fully characterized by single-crystal X-ray diffraction and a series of analytical methods, including elemental analyses, powder X-ray diffraction (PXRD), IR spectroscopy, Raman spectroscopy, UV/vis diffuse reflectance spectroscopy, and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analyses indicated that 1–3 were isostructural and exhibited a 2D network architecture through the alternative connection of [α2-P2W17O61]10− and lanthanide ions. The photoluminescence properties of 1–3 were investigated at room temperature, and 3 displayed the characteristic emissions of a Pr3+ emitting center, indicating that POMs can transfer energy and sensitize Pr3+ emissions. The reason for the weak emission intensity of Pr3+ emitting ions was because the radiationless losses via a charge-transfer Pr → W state negatively affected the emission of the Pr3+ ions in LCPs.

Graphical abstract: Synthesis, characterization, and photoluminescence properties of three two-dimensional lanthanide-containing Dawson-type polyoxometalates

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Supplementary files

Article information


Submitted
28 Jun 2019
Accepted
22 Aug 2019
First published
23 Aug 2019

Dalton Trans., 2019,48, 13850-13857
Article type
Paper

Synthesis, characterization, and photoluminescence properties of three two-dimensional lanthanide-containing Dawson-type polyoxometalates

H. Wu, M. Zhi, C. Chen, Y. Zhu, P. Ma, J. Wang and J. Niu, Dalton Trans., 2019, 48, 13850
DOI: 10.1039/C9DT02710F

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