X-RAY STRUCTURE AND SPECTROSCOPIC PROPERTIES OF PLATINUM(II) COMPLEXES OF 1,1'-BIISOQUINOLINE

Three platinum(II) complexes of biq (biq = 1,1'-biisoquinoline), [Pt(biq)Cl2], [Pt(biq)(py)3](ClO4)2 (py = pyridine) and [Pt(biq)(dapy)3](ClO4)2 [dapy = 4-(dimethylamino)pyridine] were prepared. Using H-1 NMR spectroscopy and X-rav crystallography, biq in the former complex was found to be bidentate and in the two latter complexes monodentate. Dihedral angles between the two isoquinoline rings were determined to be 35.18-degrees and 41.12-degrees in [Pt(biq)Cl2] and 77.61-degrees in [Pt(biq)(dapy)3](ClO4)2. The crystal structure of [Pt(biq)Cl2] is the first example of eta2-mu1 biq complexes with a five-membered chelating ring. Weak intramolecular pi-pi stacking occurs in the solid phase of [Pt(biq)(dapy)3](ClO4)2.