HYPODENTATE LIGANDS - SYSTEMATIC APPROACHES TO COMPLEXES CONTAINING DIDENTATE 2,2'/6',2''-TERPYRIDINE (TERPY) AND THE CRYSTAL AND MOLECULAR-STRUCTURES OF [RU(BIPY-N,N')(2)(TERPY-N,N')][PF6](2) AND [RU(BIPY-N,N')(2)(BTERPY-N,N')][PF6](2) (BIPY=2,2'-BIPYRIDINE, BTERPY=6-BROMO-2,2'/6',2''-TERPYRIDINE)

A series of complexes containing hypodentate didentate 2,2':6',2 ''-tetrpyridine (terpy) ligands of general formula [Ru(L-N,N')(2)(terpy-N,N')](2+) [L = 2,2'-bipyridine (bipy) or 1,10-phenanthroline] have been prepared. The complexes [Ru(bipy-N,N')(2)(terpy-N,N')][PF6](2) and [Ru(bipy-N,N')(2)(bterpy-N,N')][PF6](2) (bterpy = 6-bromo-2,2':6'2 ''-terpyridine) have been structurally characterised and shown to contain the didentate terpy ligand in the solid state.