Diversity of coordination modes in the polymers based on 3,3′,4,4′-biphenylcarboxylate ligand

Four new compounds [Ni 2(4,4′-bpy)(3,4-bptc)(H 2O) 4] n ( 1), [Ni(4,4′-bpy)(3,4-H 2bptc)(H 2O) 3] n ( 2), [Mn 2(2,2′-bpy) 4(3,4-H 2bptc) 2] ( 3) and {[Mn(1,10-phen) 2(3,4-H 2bptc)]·4H 2O} n ( 4) (3,4-H 4bptc=3,3′,4,4′-biphenyltetracarboxylic acid, 4,4′-bpy=4,4′-bipyridine, 2,2′-bpy=2,2′-bipyridine, 1, 10-phen=1, 10-phenanthroline), have been prepared and structurally characterized. In all compounds, the derivative ligands of 3,4-H 4bptc (3,4-bptc 4− and 3,4-H 2bptc 2−) exhibit different coordination modes and lead to the formation of various architectures. Compounds 1 and 2 display the three-dimensional (3D) framework: 1 shows a 3,4-connected topological network with (8 3)(8 5·10) topology symbol based on the coordination bonds while in 2, the hydrogen-bonding interactions are observed to connect the 1D linear chain generating a final 3D framework. 3 exhibits the 2D layer constructed from the hydrogen-bonding interactions between the dinuclear manganese units. Complex 4 shows the double layers motif through connecting the 1D zigzag chains with hydrogen-bonded rings. The thermal stability of 1– 4 and magnetic property of 1 were also reported. Four coordination compounds exhibiting four coordination modes of the 3,3′,4,4′-biphenylcarboxylate ligand, with three of new in this system, are obtained showing diversified architectures.