• Kubicki, Maciej
• Hnatejko, Zbigniew
• Dutkiewicz, Grzegorz Edward
• Lis, Stefan

Abstract

<p>This paper reports a study concerning the isolation and characterization of mixed ligand complexes of the Co(II) ions with pyridinecarboxylic acids N-oxides (picolinic (PNO), nicotinic (NNO) and isonicotinic (INO)), [Co(PNO)₂(4,4′-byp)]·6H₂O 1, [Co(NNO)(4,4′-byp)NO₃]·8H₂O 2 and [Co(INO)(4,4′-byp)NO₃]·7H₂O 3; (4,4′-byp = 4,4′-bipyridine). The complexes 2 and 3 were prepared by the hydrothermal synthesis. The structures of the complexes were elucidated on the basis of elemental analysis, thermal decomposition, IR and mass spectroscopy. IR spectra show that N-oxides act as bidentate ligands, in which both the N-oxide and the carboxylate groups are involved in coordination. In 2 and 3 the Co(II) ion exists in the same coordination environment. For 1, the X-ray crystal structure has been determined and it turned out that it contains the coordination polymers, created by the chains of Co ions joined by 4,4′-byp ligands. The Co(II) ion occupies the center of symmetry in the space group C2/c. This ion is coordinated by two nitrogen atoms (from two 4,4′-byp ligands) and four oxygen atoms from two PNO anions. The extensive network of hydrogen bonds involving six different water molecules connects the one-dimensional polymers into three-dimensional crystal structure. © 2012 Elsevier B.V. All rights reserved.</p>

Topics

• impedance spectroscopy
• polymer
• Oxygen
• Nitrogen
• Hydrogen
• cobalt
• thermal decomposition
• one-dimensional
• space group
• elemental analysis