Syntheses and Crystal Structures of Binuclear Manganese Complexes with Mixed Ligands

Three binuclear Mn(Ⅲ) complexes[Mn_2(DSH) (acac)_2(EtOH)_2]·2H_2O(1), [Mn_2(DSH)-(acac)_2(H_2O)_2]·2H_2O(2) and [Mn_2 (DSH) (acac)_2(py)_2] (3), where DSH(1, 2-disalicyloyl-hydrazine) is the ligand, have been synthesized and characterized by X-ray diffractometry and cyclic voltammetry. Complex 1 crystallizes in triclinic, space group P1, α=1.197 60(6)nm, b=1.208 04(7) nm, c=1.372 98(7) nm, α=89..737(2)°, β=65.900 (4)°, γ=68.752(2)°and Z=2. Complex 2 crystallizes in monoclinic, space group P2_1/n,α=1.196 5(1)nm, b=0.823 17(7)nm, c=1.400 1(1)nm, β=101.035(4)°and Z=2. Complex 3 also crystallizes in monoclinic, space group P2_1/n, α=1.183 11(5)nm, b=0.886 93(5)nm, c=1.655 37(8)nm, β=100.581(4)°and Z=2. In all of the three title complexes, there are centrosymmetrical binuclear manganese complex molecules. Each ligand DSH~(4-) in these complexes bridges the two Mn atoms through its hydrazine N—N group. The manganese atoms in the three complexes have a distorted octahedral geometry.