Abstract
Abstract The reactions of Ni(NO3)2 · 6H2O/Cu(OAc)2 · H2O, 5-ethyl-pyridine-2,3-dicarboxylic acid (H2epda), and 2,2′-bipyridine (2,2′-bipy) under hydrothermal condition produced two new coordination polymers [Ni(Hepda)2(H2O)2] (1) and [Cu(epda)(2,2′-bipy)] (2), which were characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, and single-crystal X-ray diffraction. In 1, each NiII center is six-coordinated in a distorted NiO4N2 octahedral geometry. Adjacent structural units are joined by strong intermolecular O–H · · · O hydrogen bonding to generate a layered structure. In 2, the CuII centers are bridged by epda dianions to form chains, where the 2,2′-bipy ligands bristle out on two sides, establishing π-π stacking interactions, Adjacent chains are thus aggregated in layers. The magnetic properties of 1 and 2 were investigated, and the exchange interactions were found to be −1.62 and −2.24 cm−1, respectively.
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