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H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates


Three oxalate-bridging lanthanide-based polyoxometalates (Ln-POMs) K17Na2H5[{Ln{(As2W19O67(H2O))(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). Structural characterization study reveals that Ln-POMs 1‒3 crystallize in form of the triclinic space group P-1 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 noteworthy 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.

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Article information

10 Aug 2020
09 Oct 2020
First published
12 Oct 2020

Dalton Trans., 2020, Accepted Manuscript
Article type

H-shaped oxalate-bridging lanthanoid-incorporated arsenotungstates

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

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