Synthesis and vibrational spectra of new bis(alkoxysulfane)-dichloropalladium(II) complexes and X-ray structural analysis of [PdCl2{S(OPri)2}2]
Abstract
Reactions of L =(PriO)2S, (PrnO)2S, (MeO)(C4H8NO)S (C4H8NO = morpholino), (MeO)(C5H10N)S (C5H10N = piperidino) or (MeO)PhS with [PdCl2(NCPh)2] in toluene gave five complexes of type [PdCl2L2](yields 40–79%). An X-ray structural analysis of the air-stable, monoclinic crystals of [PdCl2{S(OPri)2}2] showed the sulfur atoms to be cis-planar co-ordinated. The two co-ordinated dialkoxysulfane ligands are rotational isomers with differing SO torsional angles (+79 and 84° for ligand 1, –106 and +82° for 2). The S–O bond lengths are in the range 1.586–1.611 Å. The infrared and Raman spectra of the five [PdCl2L2] complexes demonstrate that the rule of mutual exclusion is not obeyed, indicating a cis rather than a trans co-ordination in each case.