Syntheses, Crystal Structures and Magnetism of Two New Coordination Polymers [Ni(bix)_2Cl_2]_n and [Co(bix)Cl_2]_n

摘要

The self-assembly reactions of M~(II)Cl_2 (M = Ni, Co) with the flexible bix ligand [bix = 1,4-bis(imidazole-l-ylmethyl)benzene] yielded a 2D network [Ni~(II)(bix)_2Cl_2]_n 1 and a 1D chain [Co~(II)(bix)Cl_2]_n 2. Their crystal structures have been determined by X-ray single-crystal diffraction analysis. Complex 1 characters a two-dimensional grid-type structure and crystallizes in monoclinic, space group P2_1/c with a = 7.7231(7), b = 12.7787(9), c = 13.9374(13) A, β = 105.419(4)°, C_(28)H_(28)Cl_2N_8Ni, M_r = 606.19, Z= 2, V = 1326.0(2) A~3, D_c = 1.518 g/cm~3, μ = 0.969 mm~(-1), F(000) = 628, R = 0.0429 and wR = 0.0783 for 2503 observed reflections (I > 2σ(I)). Compound 2 is a one-dimensional chain and crystallizes in orthorhombic, space group Pbca with a = 11.3696(6), b = 10.2128(6), c = 14.4943(9) A, C_(14)H_(14)Cl_2CoN_4, M_r = 368.12, Z = 4, V = 1683.01(17) A~3, D_c = 1.453 g/cm~3, μ = 1.334 mm~(-1), F(000) = 748, R = 0.0317 and wR = 0.0800 for 1778 observed reflections (I > 2σ(I)). Magnetic properties of the title complexes were also investigated.