Synthesis, characterization and X-ray structure of N-2-pyridylmethylidene-1-phenylethylamine–PdCl 2 complexes

Abstract

The PdCl 2 complexes with imines derived from reactions of 2-pyridinealdehyde with ( R)-, ( S)- and racemic 1-phenylethylamine have been synthesized and characterized by various physico-chemical methods. The ( R)- 1 and ( S)- 1 palladium complexes obtained from the ( R)- and ( S)- ligands were optical antipodes and differed only by the optical rotation sign and opposite circular dichromism spectra. Two crystals I and II resulted from these complexes were studied by the X-ray analysis. The first structure turned out to be racemic (it had the centrosymmetric space group P2 1/ c) while the second one (space group P2 1) contained the molecules of a single enantiomer. The cis chelate coordination of the organic ligand and almost square-planar coordination geometry was found for both crystals.