A new dinuclear molybdenum(V)-sulfur complex containing citrate ligand: Synthesis and characterization of K2.5Na2NH4[Mo2O2S 2(cit)2].5H2O

Article abstract of DOI:10.1016/S0992-4361(99)80014-9

The complex, K_2.5Na₂NH₄[Mo₂O₂S ₂(cit)₂]-5H₂O (1), was obtained by crystallization from a solution of (NH₄)₂MoS₄, potassium citrate (K₃cit) and hydroxyl sodium in methanol and water under an atmosphere of pure nitrogen at ambient temperature. The crystals are triclinic, space group PI, a = 7.376 (3)A, b = 14.620 (2) A, c = 14.661 (1) A, a = 71.10 (1)°, β= 81.77 (1)°, γ = 78.27(2)°, R = 0.0584 for 2545 observed (I > 2σ (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 two bridging sulfur atoms and a terminal oxygen atom completes distorted coordination octahedron around each molybdenum atom. Principal dimensions are Mo = O₁, 1.707 A (av); Mo-S_b, 2.341 A (av); Mo-O_(hydrcoxyl), 2.021 A (av); Mo-O_{(α-carbaxyl)}, 2.1290 A (av) and Mo-O_(β-carbaxyl), 2.268(av) A. IR spectrum is in agreement with the structure. Elsevier,.