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Issue 44, 2020
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H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates

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Abstract

Three oxalate-bridging lanthanide-based polyoxometalates (Ln-POMs) K17Na2H5[{(As2W19O67(H2O))Ln(H2O)2}2(C2O4)]·50H2O. [Ln = Sm3+ (1), Pr3+ (2), and Ce3+ (3)] were successfully synthesized. The structures were further characterized by single-crystal X-ray diffraction analyses, Raman spectroscopy, elemental analyses, powder X-ray diffraction (PXRD), IR spectra, UV/vis diffuse reflectance spectroscopy, and thermogravimetric analysis (TGA). The structural characterization study reveals that Ln-POMs 1–3 crystallize in the form of the triclinic space group P[1 with combining macron] and consist of an oxalate bridging di-Ln3+-incorporated H-shaped dimer, which can also be viewed as a combination of two half-units {Ln(As2W19O67(H2O))(H2O)2}222− related by an inversion center. It is worth noting that the opening angle (33.01°) from the [As2W19O67(H2O)]14− fragment in 1–3 is less than that of the [As2W19O67(H2O)]14− precursor (40.99°). Furthermore, the stability of 1–3 in aqueous solution and their solid-state photoluminescence properties have also been investigated in this work.

Graphical abstract: H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates

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Supplementary files

Article information


Submitted
10 Aug 2020
Accepted
09 Oct 2020
First published
12 Oct 2020

Dalton Trans., 2020,49, 15731-15738
Article type
Paper

H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates

H. Chen, Z. Xiao, B. Yan, H. Wu, P. Ma, J. Wang and J. Niu, Dalton Trans., 2020, 49, 15731
DOI: 10.1039/D0DT02792H

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