Abstract
Two metal-organic coordination polymers, [Co(bpe)(H 2O) 2(Hdpa) 2] n ( 1) and [Ni(bpe)(H 2O) 2(Hdpa) 2] n ( 2), have been synthesized by the reactions of 1,2-bis(4-pyridyl)ethane (bpe), diphenic acid (H 2dpa) with Co(NO 3) 2·6H 2O and Ni(NO 3) 2·6H 2O, respectively, in the presence of base. Single crystal X-ray diffraction analysis reveals that 1 and 2 are isostructural. Each of metal centers in 1 and 2 is coordinated in a slightly distorted octahedral geometry by two trans μ-bpe nitrogen ligands, two trans carboxylate oxygen atoms from different Hdpa and two trans water molecules. Hdpa acts as a monodentate ligand through one carboxylate oxygen atom coordinating to a metal center, and its uncoordinated carboxylate oxygen atom and carboxylic group form a strong hydrogen bond, resulting in a one-dimensional chain containing rectangular hydrogen bonding rings. The bpe bridges adjacent chains generating two-dimensional layer architectures of 1 and 2, respectively.
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