Subtle Coligand Effects on Chelation of (Benzyl-1-propenylmalonato)platinum(II) Complexes

The subtle coligand effect on the bonding mode of ambidentate ligand was observed in this study. In particular, the subtle properties between the (O,O') and (O,alkene) modes appear to be associated with proximity in energy between the two chelation modes of the benzyl-1-propenylmalonate ligand. Various factors should be understood prior to molecular design of new platinum compounds that exhibit desirable molecular properties. Studies on the linkage isomers of ambidentate ligands are increasingly important in molecular dynamical materials. Such results have been extended beyond the initial studies to diverse areas as quantum mechanical calculations, molecular switches, isomeric catalysts, the design of therapeutic reagents, the imaging agents in the body, and the separation of diastereomers. Although the coordination modes of ambidentate ligands may be vaguely predicted via electronic and steric effects, the coordination modes are sensitive to various factors such as central metals, oxidation states, coligands, reaction time, temperature, the solvent properties, etc. In some cases, the steric factor plays an important role in determining the relative stability of the linkage isomers. According to a previous report, an isomerism between the (O,O')- and (O,alkene)-chelates was observed for diallylmalonatoplatinum(II) complexes