• Platinum;
  • Alkene ligands;
  • Alk­yne ligands;
  • Ligand design;
  • Coordination modes


The review provides a survey of the key classes of PtII complexes containing cis-{Pt(η1-hydrocarbyl)(η2-unsaturated ligand)} moieties, which have been isolated or at least unequivocally characterized in solution. These compounds, which mimic reactive intermediates of fundamental catalytic processes, have been classified in four general types, which display a cis arrangement of an alkyl group and a monoalkene (I), an aryl group and a monoalkene (II), an alkyl group and a monoalkyne (III), and an aryl group and a monoalkyne (IV). A discussion of their main structural and chemicalfeatures, disclosing the factors affecting their reactivity, dynamic behavior, and relative stability, is presented. In some remarkable cases (III and IV), it is the cis arrangement of the hydrocarbyl fragments that promotes unusual reactivity.