Platinum(II) complex with S=1/2 organic radical ligand

A platinum(II) complex with organic radical ligand p-NNpy (=2-(4'-pyridyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) is synthesized. X-ray crystallographic analysis revealed that it has a square-planer four-coordinate anionic structure with formula of [Pt(p-NNpy)Cl 3 ] - . Paramagnetic behavior which correspond to S=1/2 was observed with weak intermolecular antiferromagnetic interaction in the temperature range of 2-300 K. The structure, magnetic property and spectroscopic data will be reported.