Mixed-ligand platinum and palladium complexes based on dinitrogen chelating ligands and a pyridine bearing the nitronylnitroxide radical

摘要

Novel cationic mixed-ligand palladium and platinum complexes based on the chelating ligands 4,7-dimethyl-1,10-phenanthroline and 2,2'-bipyridine with a pyridine bearing the nitronylnitroxide radical are reported.The synthesis,X-ray crystal structures and magnetic properties of the two complexes[Pd(4,7-dimethyl-1,10-phenanthrolme)(NIT-pPy)2](PF6)2.DMF and[Pt(2,2'-bipyridine-N,N')(NIT-pPy)2](PFe)2·0.25H2O,(where NIT-pPy=2-(p-pyridyl)-4,4,5,5-tetramethylimidazoline-l-oxyl-3-oxide)are described.The two metal complexes show a strained square planar geometry.Short intermolecular contacts take place through the nitroxide groups and weak intermolecular antiferromagnetic interactions are dominant at low temperature.