Synthesis and Crystal Structure of an Interpentateing 3-D Framework Constructed from Mixed Ligands

A novel organic-inorganic hybrid compound constructed from mixed ligands, Co3(SIP)2(bipy)4(H2O)6·6.5H2O(H3SIP = 5-sulfoisophthalic acid, bipy = 4,4’-bipyridyl), has been hydrothermally synthesized and characterized by IR, TGA and single-crystal X-ray diffraction.The crystal belongs to orthorhombic, space group P212121 with a = 11.395(2), b = 19.395(4), c = 30.675(6) , Mr = 1513.05, V = 6779(2) 3, Dc = 1.482 g/cm3, F(000) = 3120, μ = 0.873 mm-1, Z = 4, the final R = 0.0439 and wR = 0.119 for 13421 observed reflections with I > 2σ(I).The structure of the compound presents a 3-D framework containing Co-bipy 1-D chain and 2-D bilayer motifs and carboxylate spacers, and the connection of 1-D chain and 2-D bilayer motifs by carboxylate ligand results in the final open framework with twofold interpenetration net.A probe reaction of the oxidation of benzaldehyde with H2O2 using the title compound as catalyst was carried out in a liquid-solid system, showing that the compound has high oxidative catalytic activity to the reaction.