Mobybdenum(VI)-oxygen complex containing citrage ligand: synthesis and characterization of K6[Mo2O5(cit)2]·5H2O

Abstract The complex, K 6 [Mo 2 O 5 (cit) 2 ]·5H 2 O was obtained by crystallization from reaction of [Et 4 N] 3 [Mo 2 FeS 8 O 2 and potassium citrate (K 3 cit) in methanol and water under an atmosphere of pure nitrogen at ambient temperature. The complex is triclinic, space group P1, a = 11.843(8) A, b = 13.717(8) A, c = 10.287(5) A, α = 108.11(4) °, β = 99.42(5) (1) °, γ = 66.52(4) °, R = 0.034 for 4510 observed (I > 3 σ (I)) reflections. Single crystal structure analysis reveals that citrate ligand coordinated to molybdenum atom through two carboxylato oxygens and one deprotonated hydroxyl oxygen together with one bridging oxygen atom and two terminal oxygen atoms completes distorted coordination octahedron around each molybdenum atom. IR spectra are in agreement with the structure.