Two New 3-D Supramolecular Complexes Based on Tetradentate Carboxylate Linker and Bis-pyridyl-bis-amide Ligand: Syntheses, Structures and Electrochemical Properties

Abstract

Two new 3-D supramolecular complexes [M2(4-bpcb)(bbtc)(H2O)5]·3H2O [M = Co (1), Ni (2), 4-bpcb = N,N′-bis(4-pyridinecarboxamide)-1,4-benzene, bbtc = 3,3′,4,4′-benzophenonetetracarboxylate] have been hydrothermally synthesized by self-assembly of 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (bbtcd) and bis-pyridyl-bis-amide 4-bpcb mixed ligands. X-ray diffraction analysis reveals that two-dimensional (2-D) coordination networks of complexes 1 and 2 are constructed from neutral {M4(bbtc)2(H2O)10}n [M = Co (1), Ni (2)] ribbon-like chains and ligand 4-bpcb with bidentate coordination mode. The adjacent layers for 1 and 2 are further linked by hydrogen bonding interactions to form 3-D supramolecular frameworks. Moreover, the thermal properties and the electrochemical properties of the two title complexes have been reported. Two new three-dimensional supramolecular complexes based on two-dimensional polymer layer, [M2(4-bpcb)(bbtc)(H2O)5]·3H2O [M = Co (1), Ni (2)], have been synthesized from hydrothermal reaction of metal(II) chloride with the mixed ligands 3,3′,4,4′-benzophenonetetracarboxylic acid dianhydride (bbtcd) and bis-pyridyl-bis-amide ligand N, N′-bis(4-pyridinecarboxamide)-1,4-benzene (4-bpcb).