Lk. Cheng et al., X-RAY STRUCTURE AND SPECTROSCOPIC PROPERTIES OF PLATINUM(II) COMPLEXES OF 1,1'-BIISOQUINOLINE, Polyhedron, 12(10), 1993, pp. 1201-1207
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.