Hydrothermal Synthesis,Crystal Structure and Magnetic Properties of a Cobalt(II) Coordination Polymer Assembled by 4-Sulfophthalate and 4,4'-Bipyridine

A novel metal-organic coordination polymer {[Co2(4-sphth)2(4,4'-bpy)4(H2O)4]- [Co(4,4'-bpy)2(H2O)4]}n (4-sphth = 4-sulfophthalic acid, 4,4'-bpy = 4,4'-bipyridine) 1 has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, elemental analyses, IR spectroscopy, and magnetic susceptibility measurements. The complex crystallizes in monoclinic, space group C2/c with a = 18.893(6), b = 23.080(7), c = 22.473(7) ', β = 107.311(4)o, V = 9356(5) '3, C76H70Co3N12O22S2, Mr = 1744.35, Dc = 1.238 g/cm3, μ(MoKα) = 0.640 mm'1, F(000) = 3596, Z = 4, the final R = 0.0444 and wR = 0.0846 for 9178 observed reflections (I 2σ(I)). It exhibits a novel three-dimensional supramolecular network formed by hydrogen-bonding and π-π interactions. Variable-temperature magnetic measure shows an overall anti-ferromagnetic behavior for compound 1.