X-ray structure characterization of palladium(II) ternary complexes of pyridinedicarboxylic and phthalic acid with phenanthroline and bipyridine

Abstract

The crystal structures of the series of four ternary complexes, [Pd(phen)(2,6-PDCA)]·4H2O (1) (phen = 1,10-phenanthroline; 2,6-PDCA = 2,6-pyridinedicarboxylic acid), [Pd(bpy)(2,3-PDCA)]·3H 2O (2) (bpy = 2,2′-bipyridineand; 2,3-PDCA = 2,3-pyridinedicarboxylic acid) and [Pd(phen)(PHT)]·2.5H2O (3) (PHT = o-phthalic acid) and [Pd(bpy)(PHT)]·1.5H2O (4), are determined and the coordination modes of palladium(II) ternary complexes are characterized. All complexes take the mononuclear Pd(II) complexes, in which central Pd(II) atom of each complex has a similar distorted square-planar four coordination geometry. In all complexes, the aromatic heterocyclic compounds, phen and bpy, behave as a bidentate N, N′ ligand. In the complex 1 and 2, 2,6-PDCA and 2,3-PDCA behave as a bidentate N, O ligand, and in complex 3 and 4, PHT behaves as a bidentate O, O′ ligand. © 2005 Pharmaceutical Society of Japan.