Hydrothermal synthesis and crystal structure of [Co(2,5-pydc)(H2O)2]n · nH2O (2,5-pydc = 2,5-pyridinedicarboxylate)

A new cobalt(II) compound, [Co(2,5-pydc)(H2O)2]n · nH2O (1) has been synthesized hydrothermally and characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis, and single crystal X-ray diffraction. The crystal structure consists of Co(II) centers linked via 2,5-pydc ligands and water molecules, in which every 2,5-pydc ligand adopts the coordination form in quadridentate –NOOO′ mode. The structure is 2-D networks and neighboring layers are further extended into a 3-D supramolecular architecture through hydrogen-bonding interactions between water molecules and carboxyl oxygen atoms.