Synthesis and Characterization of a Novel Hydrogen-Bonded Three-dimensional Porous Co（II） Compound

A hydrogen-bonded three-dimensional cobalt(Ⅱ) compound, {[Co(2,2′-bipy)-(Hbtc)(HaO)3].3HaO}n 1 (H3btc =1,3,5-benzenetricarboxylic acid, 2,2′-bipy = 2,2′-bipyridine), has been synthesized and characterized by single-crystal X-ray diffraction analysis, IR and TGA. Compound 1 crystallizes in monoclinic, space groups P21/n, C19H36CoN2O12, Mr=543.43, a=7.6930(2), b= 19.3715(6), c= 15.9408(5)A, β=95.8750(10)°, V= 2363.10(12)A^3, Z=4, Dc=1.527 g/cm^3,μ=0.792mm^-1, F(000)=1148, R = 0.0489 and wR = 0.1437 for 4085 reflections. The Co(Ⅱ) atom is coordinated by an oxygen atom of monodentate Hbtc^2-, two nitrogen atoms of 2,2′-bipy and three water molecules into a slightly distorted octahedral geometry. The intermolecular hydrogen bonding interactions among the adjacent [Co(2,2′-bipy)(Hbtc)(H2O)3] extend the compound into a three-dimensional porous supramolecular framework. The uncoordinated water molecules act as space-fillers and consolidate the whole architecture through the hydrogen bonding interactions.