Pyridine-2,5-dicarboxylic acid complexes of nickel(II) with 2,2'-bipyridine and 1,10-phenanthroline coligands; syntheses, crystal structures, spectroscopic and thermal studies


ÇOLAK A. T. , Akduman D., YEŞİLEL O. Z. , BÜYÜKGÜNGÖR O.

TRANSITION METAL CHEMISTRY, vol.34, no.8, pp.861-868, 2009 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 8
  • Publication Date: 2009
  • Doi Number: 10.1007/s11243-009-9275-z
  • Title of Journal : TRANSITION METAL CHEMISTRY
  • Page Numbers: pp.861-868

Abstract

Two pyridine-2,5-dicarboxylic acid (pydcH(2)) complexes of nickel(II) with 2,2'-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)]center dot 7H(2)O and [Ni(pydc)(phen)(2)]center dot 6.5H(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 A degrees C on heating in a static air atmosphere.