Ethylenediamine tetraacetato trioxomolybdate(VI) and tungstate(VI) and their reactions with hydrogen peroxide

Abstract

Investigation of the reactions between ethylenediamine tetraacetic acid with molybdate(VI) and tungstate(VI) resulted in the isolations of dimeric complexes Na2K2 [Mo2O6 (Edta)] center dot 10H(2)O (1) and Na-4 [W2O6 (Edta)] center dot 8H(2) O (2) (H(4)Edta=ethylenediamine tetraacetic acid) in a wide range of pH values 5-10. The new tungstate complex is resistant for the reaction of hydrogen peroxide, while the reaction of its molybdate homolog results in the isolation of peroxo tetramolybdate(VI) K-8 [Mo4O12 (O-2 )(2)] (3). The three complexes have been characterized by elemental analyses, IR, NMR and X-ray structural analyses. The anions of the complexes 1 and 2 contain two metal atoms and one Edta ligand. Each metal atom is tridentately coordinated by nitrogen and carboxyl groups of Edta ligand, making metal atom six-coordinate.