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Phase formation in the system Co2+–WO4 2−–H+–C3H7ON–H2O. Synthesis, crystal structure, and characterization of cobalt(II) decatungstate [Co(C3H7NO)5]2[W10O32]

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The phase formation processes of isopolytungstates in the systems Co2+–H+–DMF–H2O (DMF-dimethylformamide) with different acidities (Z = ν(H+)/ν = 1.14–1.60) have been studied. It was found that only cobalt(II) hepta-, para-, and decatungstates could be isolated from aqueous DMF solutions. The chemical and FTIR spectroscopic analysis of the products isolated from the system allowed determination of conditions of Co(II) decatungstate formation. Cobalt(II) decatungstate, [Co(C3H7NO)5]2[W10O32], was characterized by elemental and EDX spectral analysis, SEM, FTIR spectroscopy, thermal analysis, single-crystal X-ray diffraction, and by UV–vis spectroscopy analysis.
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Keywords: Aqueous dimethylformamide solution; Cobalt(II); Crystal structure; Decatungstate; Isopolytungstates

Document Type: Research Article

Affiliations: 1: Faculty of Chemistry, Department of Inorganic Chemistry, Donetsk National University, Donetsk, Ukraine 2: State Scientific Institution “Institute for Single Crystals” of NAS of Ukraine, Kharkov, Ukraine

Publication date: December 2, 2015

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