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New arylbismuth(lll) oxinates, PhBi(MeOx)(2), (p-MeC(6)H(4))Bi(Ox)(2), (p-MeC(6)H(4))Bi(MeOx)(2), (p-ClC(6)H(4))Bi(Ox)(2), and (p-ClC(6)H(4))Bi(MeOx)(2) (Ox(-) = quinolin-8-olate and MeOx(-)=2-methylquinolin-8-olate) have been prepared by reaction of the appropriate diarylbismuth chlorides with Na(Ox) or Na(MeOx) in the presence of 15-crown-5. An X-ray crystallographic study has shown PhBi(MeOx)(2) to be a five coordinate monomer with distorted square pyramidal stereochemistry. Chelating MeOx ligands have a cisoid arrangement in the square plane and the phenyl group is apical. The lattice is stabilised by significant pi-pi interactions between centrosymmetric molecules. A range of these complexes has been shown to have high in vitro biological activity (comparable with or better than cisplatin) against L1210 leukaemia, the corresponding cisplatin resistant line, and a human ovarian cell line, SKOV-3. However, initial in vivo testing against a solid mouse plasmacytoma (PC6) and P388 leukaemia has not revealed significant activity.

Preparation and Anti-Tumour Activity of Some Arylbismuth(III) Oxine Complexes