Abstract New platinum (II) complexes have been prepared as models for explaining the coordination of multiple β-diketonate li-gands to give [Pt (O, O′-acac)(γ-acac) L] species. The new com-pounds containing both an O, O′-chelated acetylacetonate ligand and a sulfoxide in the platinum coordination sphere,[PtCl (O, O′-acac)(DMSO)](1) and [Pt (O, O′- acac)(γ-acac)(DMSO)](2), have been synthesised and characterised by 1 H, 13 C, 195 Pt ...