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

Four new compounds [Ni2(4,4′-bpy)(3,4-bptc)(H2O)4]n (1), [Ni(4,4′-bpy)(3,4-H2bptc)(H2O)3]n (2), [Mn2(2,2′-bpy)4(3,4-H2bptc)2] (3) and {[Mn(1,10-phen)2(3,4-H2bptc)]·4H2O}n (4) (3,4-H4bptc=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-H4bptc (3,4-bptc4− and 3,4-H2bptc2−) 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 (83)(85·10) 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.