Syntheses and Crystal Structures of [Ni（L）e（NCS）2] and [Co（L）e（NCS）2] （L = Azobis（2-pyridine）

The ligand azobis(2-pyridine) L was used in the synthesis of two new organic-inorganic coordination complexes: [Ni(L)2(NCS)2] 1 and [Co(L)2(NCS)2] 2. Crystal data for 1: monoclinic, space group C2/c, a = 13.361(18), b = 10.731(15), c = 18.14(2) A^°, β = 109.86(2)°, V= 2446(6)A^°3, Z= 4, Mr= 543.25, Dc = 1.410 g/cm^3, μ= 0.993 mm^-1, F(000) = 1064, T= 298(2) K, R = 0.0454 and wR = 0.1010 for 1288 observed reflections with I > 2σ(I); and those for 2: monoclinic, space group C2/c, a = 13.35(2), b = 10.806(15), c = 18.06(2)A^°,β = 110.34(2)°, Z= 4,Mr= 543.49, Dc = 1.413 g/cm^3,μ=0.902 mm^-1, F(000) = 1060, T=298(2) K, R = 0.0699 and wR=0.1354 for 728 observed reflections with 1 > 2σ(I). Single-crystal X-ray diffraction studies revealed that 1 and 2 have similar structures, in which each Ni(Ⅱ) or Co(Ⅱ) cation is coordinated by two L ligands and two terminal thiocynates (NCS^-).