Molybdenum(VI) complex with citric acid: synthesis and structural characterization of 1:1 ratio citrato molybdate K 2Na 4[(MoO 2) 2(cit) 2]·5H 2O

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Sodium potassium citrato molybdate K 2Na 4[(MoO 2) 2O(cit) 2]·5H 2O has been prepared by the reaction of potassium trihydrogen citrate and sodium molybdate. Analysis of the crystal structure reveals that the anion of the complex contains a bent (MoO 2)O(MoO 2) core with an MoOMo angle 142°. Each molybdenum has a distorted octahedral coordination and citrato ligands are tridentate to the two molybdenum atoms via the deprotonated hydroxy-, α- and β-carboxyl groups. Principal dimensions are: [MoO(t)] av, 1.706(4); [MoO(b)] av, 1.899(3); [MoO(hydroxy)] av, 1.944(3); [Mo Oα-carboxyl)] av, 2.207(3), and [MoO(β-carboxyl)] av, 2.264(3) Å. The IR, 1H and 13C NMR spectra are in agreement with this structure.