The crystal structure analysis of some organometallic compounds

At this work, C37H35Br2Cl2N2PPd and C46H60Cl2N4Pd complexes crystal structure analyses have been done by using single cyrstal X-Ray diffraction method. The C37H35Br2Cl2N2PPd compound which was crystallized in orthorombic system is related to Pbcn space group. The molecule has a slightly distorted square-planar coordination around the Pd metal centre and has a distorted tetrahedral coordination around the P atom. The Pd-C bond distance between the N-heterocyclic ligand and the metal atom is 2,039(6) ?. The dihedral angle between 2-6 dimetil fenil ring planes is 34,6(4)°. There are short intramolecular contacts like C-H?Cl and CH? N. The molecules have been packed by the contacts between C-H?Cl type molecules in the crystal structure. Besides, the crystal structure is showed ?-? contacts. The C46H60Cl2N4Pd compound which was crystallized in the monoclinic system is related to C2/c space group. There are two independent half-molecules in the asymetric unit. The Cl atoms and the N-heterocyclic ligands around the Pd atom form slightly distorted square-planar structure. The crystal structure is stabilized with X-H?? contacts besides C-H?N ve C-H?Cl type weak molecule contacts. Crystallographic results of both structure are not good because of poor crystal quality. Key Words: Crystal structure, Organometallic Compounds, Palladium, Nheterocyclic carbene.