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Multinuclear cobalt(II)-containing heteropolytungstates: structure, magnetism, and electrochemistry
Masooma Ibrahim1, Ali Haider, Yanhua Lan
1School of Engineering and Science, Jacobs University , P.O. Box 750 561, 28725 Bremen, Germany.
Abstract:
Interaction of the trilacunary Keggin polyanions [A-α-XW9O34](10-) (X = Si(IV), Ge(IV)) with Co(II) and phosphate ions in aqueous, basic media and under mild heating leads to the formation of the tetrameric, Co16-containing heteropolytungstates [{Co4(OH)3PO4}4(A-α-XW9O34)4](32-) (X = Si(IV), Ge(IV)). Both polyanions were characterized in the solid state by single-crystal X-ray diffraction, IR spectroscopy, and thermogravimetric and elemental analyses. Furthermore, the electrochemical and magnetic properties of these isostructural polyanions were investigated.
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