Two pyridine-2,5-dicarboxylic acid (pydcH 2 ) complexes of nickel(II) with 2,2 0 -bipyridine and 1,10-phenanthroline were synthesized and characterized by elemental, spectroscopic, thermal analysis, magnetic measurements and single crystal X-ray diffraction techniques. Both [Ni(pydc)(bipy) 2 ]Á7H 2 O and [Ni(pydc)(phen) 2 ]Á6.5H 2 O crystallize in the monoclinic system and P2 1 /c space group. The Ni(II) ions are coordinated by two bidentate bipy or phen ligands and one pydc dianion in a distorted octahedral geometry. The pydc ligand is coordinated through the pyridine nitrogen atom and oxygen atom of carboxyl group as a bidentate ligand. Both carboxylate groups of pydc are deprotonated but only the 2-carboxylate is coordinated to the metal. Thermal decompositions of the complexes have been studied over the range 30-600°C on heating in a static air atmosphere.
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