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(b iq)Cl2], [Pt(biq)(py)3](ClO4)2 (py = pyridine) and [Pt(biq)(dapy)3](Cl O4)2 [dapy = 4-(dimethylamino)pyridine] were prepared. Using H-1 NMR s pectroscopy and X-rav crystallography, biq in the former complex was f ound to be bidentate and in the two latter complexes monodentate. Dihe dral angles between the two isoquinoline rings were determined to be 3 5.18-degrees and 41.12-degrees in [Pt(biq)Cl2] and 77.61-degrees in [P t(biq)(dapy)3](ClO4)2. The crystal structure of [Pt(biq)Cl2] is the fi rst example of eta2-mu1 biq complexes with a five-membered chelating r ing. Weak intramolecular pi-pi stacking occurs in the solid phase of [ Pt(biq)(dapy)3](ClO4)2.