New Two-Dimensional Metal-Organic Networks Constructed from 1,2,4,5-Benzenetetracarboxylate and Chelate Ligands

Two novel nickel coordination polymers [Ni2(2,2ʹ-bipy)2(OH)2(H2btec)]3n (1) and [Ni2(1,10ʹ-phen)2(H20)2(btec)]n (2) (btec = 1,2,4,5-benzenetetracarboxylate) have been hydrothermally synthesized and characterized by elemental analyses, IR and XPS spectra, TG analysis, X-ray powder diffraction, and single crystal X-ray diffraction. Crystal data for 1:...... Compound 1 exhibits a novel one-dimensional chainlike structure, in which the dinuclear Ni centers are linked by the btec ligands. Furthermore, the adjacent chains are linked into a 2-D wavelike layer via the strong OH...O hydrogen bonding interactions. Compound 2 possesses an unusual two-dimensional steplike network with interesting rhombic grids. Both compounds exhibit unprecedented metal-organic ligand construction modes in {M/btec/L} (M = transition metal; L = chelate ligands) systems. The magnetic behaviors of compounds 1 and 2 have been studied.