engleski

Synthesis and structure of two molybdovanadates containing coordinatively bound oxalato ligands: (NH_4)_6[Mo_6V_2O_2_4(C_2O_4)_2]ˇ6H_2O and (NH_4)_4[H_2Mo_2V_2O_1_2(C_2O_4)_2]ˇ2H_2O

The compounds (NH_4)_6[Mo_6V_2O_2_4(C_2O_4)_2]ˇ6H_2O (I) and (NH_4)_4[H_2Mo_2V_2O_1_2(C_2O_4)_2]ˇ2H_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_2_4(C_2O_4)_2]^6^- found in (I) consists of six MoO_6 and two VO_6 edge-sharing octahedra of the gama- [Mo_8O_2_6]^4^- type structure, the tetranuclear anion [H_2Mo_2V_2O_1_2(C_2O_4)2]^4^- of (II) adopts the structure with a Mo_4O_1_6 core. Both complexes cotain 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.

crystal structure determination; molybdovanadates; oxalato ligand.

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