The dark-brown compound [N(Me)4]4[AsIII8VIV14O42(0.5H2O)] containing a spherical anion [AsIII8VIV14O42(0.5H2O)]4– containing condensed VO5 square pyramids and As 2O5 units, is synthesized hydrothermally from As2O3, V2O5 and (Me)4NOH and structurally characterized by X-ray diffraction.
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Huan et al. (1991) studied this question.
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