Synthesis and characterization of some new acetato complexes of molybdenum(IV), (V) and (VI).: Crystal structures of Na 2[Mo 2O 4(OCOCH 3) 6]·NaOCOCH 3·CH 3COOH and K[MoO 2(OCOCH 3) 3]·CH 3COOH

Abstract

The acetato complexes of molybdenum(VI), (V) and (IV): [MoO 2(OCOCH 3) 2] ( 1), Na 2[Mo 2O 4(OCOCH 3) 6]·NaOCOCH 3·CH 3COOH ( 2), K[MoO 2(OCOCH 3) 3]·CH 3COOH ( 3), [Mo 2O 3(OCOCH 3) 4] ( 4), [Mo 3O 2(OCOCH 3) 6(H 2O)(OH) 2]·16H 2O ( 5) and [Mo 3O 2(OCOCH 3) 6(H 2O) 3]Cl 2·14H 2O ( 6) have been prepared and characterized by chemical analyses, ESR and IR spectroscopy. The crystal structures of 2 and 3 have been determined by single-crystal X-ray crystallography. Both complexes contain octahedrally coordinated molybdenum atoms with bonds formed to two terminal oxo-oxygen atoms and four oxygen atoms from the acetate ligands. In 2 two acetate ligands are monodentately bonded to each molybdenum atom while the third one together with its centrosymmetrical pair acts as a bridging ligand between two molybdenum atoms. In 3 two acetate ligands are monodentately and one bidentately bonded to molybdenum. In both structures the acetic acid molecules are not involved in bonding to molybdenum but act as bridges over both (in 2) or only one oxygen atom (in 3) connecting centrosymmetrically related sodium and potassium ions, respectively.