Syntheses and crystal structures of [Ni(L)2(NCS)2] and [Co(L)2(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) Angstrom, beta = 109.86(2)degrees, V = 2446(6) Angstrom(3), Z = 4, M-r = 543.25, D-c = 1.410 g/cm(3), mu = 0.993 mm(-1), F(000) = 1064, T = 298(2) K, R = 0.0454 and wR = 0.1010 for 1288 observed reflections with I > 2sigma(I); and those for 2: monoclinic, space group C2/c, a = 13.35(2), b = 10.806(15), c = 18.06 (2) Angstrom, beta = 110.34(2)degrees, Z = 4, M-r = 543.49, D-c = 1.413 g/cm(3), mu = 0.902 mm(-1), F(000) = 1060, T = 298(2) K, R = 0.0699 and wR = 0.1354 for 728 observed reflections with I > 2sigma(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-).