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Issue 11, 2021
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Synthesis, structure, electrochemistry and magnetism of cobalt-, nickel- and zinc-containing [M4(OH)3(H2O)2(α-SiW10O36.5)2]13− (M = Co2+, Ni2+, and Zn2+)

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Abstract

Interaction of the trilacunary 9-tungstosilicate [A-α-SiW9O34]10− with cobalt(II), nickel(II) and zinc(II) ions in pH 9 aqueous medium at room temperature led to the formation of the respective M4-containing heteropolytungstates [M4(OH)3(H2O)2(α-SiW10O36.5)2]13− (M = Co2+ (1), Ni2+ (2), and Zn2+ (3)). Polyanions 1–3 were characterized in the solid state by single-crystal XRD, FT-IR spectroscopy, and thermogravimetric and elemental analyses. Electrochemical studies showed that the Co2+ ions in 1 can be oxidized to Co3+ and the CVs of the WVI centers of the polyanions feature well-defined and chemically reversible reduction waves. Magnetic measurements on 1 and 2 showed paramagnetism with complex ferromagnetic and antiferromagnetic interactions. A model was presented for extracting the exchange constants for the magnetic exchange interaction.

Graphical abstract: Synthesis, structure, electrochemistry and magnetism of cobalt-, nickel- and zinc-containing [M4(OH)3(H2O)2(α-SiW10O36.5)2]13− (M = Co2+, Ni2+, and Zn2+)

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Supplementary files

Article information


Submitted
30 Sep 2020
Accepted
26 Jan 2021
First published
26 Jan 2021

Dalton Trans., 2021,50, 3923-3930
Article type
Paper

Synthesis, structure, electrochemistry and magnetism of cobalt-, nickel- and zinc-containing [M4(OH)3(H2O)2(α-SiW10O36.5)2]13− (M = Co2+, Ni2+, and Zn2+)

A. Haider, B. S. Bassil, Z. Lin, X. Ma, P. J. Haferl, J. K. Bindra, J. Kinyon, G. Zhang, B. Keita, N. S. Dalal and U. Kortz, Dalton Trans., 2021, 50, 3923 DOI: 10.1039/D0DT03392H

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