Abstract
The compounds (NH 4) 6[Mo 6V 2O 24(C 2O 4) 2]·6H 2O ( I) and (NH 4) 4[H 2Mo 2V 2O 12(C 2O 4) 2]·2H 2O ( II) have been prepared from molybdenum(VI) oxide and ammonium vanadate in aqueous solution through the addition of ammonium oxalate, and their structures determined by X-ray structure analysis. Whereas the molybdovanadate anion [Mo 6V 2O 24(C 2O 4) 2] 6− found in ( I) consists of six MoO 6 and two VO 6 edge-sharing octahedra of the γ-[Mo 8O 26] 4− type structure, the tetranuclear anion [H 2Mo 2V 2O 12(C 2O 4) 2] 4− of ( II) adopts the structure with a M 4O 16 core. Both complexes contain bidentate oxalato ligands bonded to the vanadium ions. In both crystal structures the molybdovanadate anions are mutually hydrogen bonded by ammonium ions and water molecules.
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