Mobybdenum(VI)-oxygen complex containing citrage ligand: synthesis and characterization of K-6[Mo2O5(cit)(2)]center dot 5H(2)O

The complex, K-6[Mo2O5(cit)(2)].5H(2)O was obtained by crystallization from reaction of [Et4N](3)[Mo2FeS8O2] and potassium citrate (K(3)cit) in methan ol and water under an atmosphere of pure nitrogen at ambient temperature. T he complex is triclinic, space group P (1) over bar, a = 11.843(8) Angstrom , b = 13.717(8) Angstrom, c = 10.287(5) Angstrom, alpha = 108.11(4)degrees, beta = 99.42(5) (1)degrees, gamma = 66.52(4)degrees, R = 0.034 for 4510 ob served (I > 3 sigma (I)) reflections. Single crystal structure analysis rev eals that citrate ligand coordinated to molybdenum atom through two carboxy lato oxygens and one deprotonated hydroxyl oxygen together with one bridgin g oxygen atom and two terminal oxygen atoms completes distorted coordinatio n octahedron around each molybdenum atom. IR spectra are in agreement with the structure.