New cationic five-coordinate monoolefin hydrocarbyl complexes of platinum(II)

Cationic trigonal bipyramidal complexes of the type [PtRL(NN′)(olefin)]BF4 with various hydrocarbyl (R), neutral monodentate (L), and bidentate nitrogen (NN′) ligands have been prepared and characterized by elemental analysis, conductivity measurements, and 1H NMR spectroscopy. The coordination around PtII is trigonal bipyramidal, with the olefin and the NN′ ligand in equatorial positions. The reversible loss of the olefin is markedly affected by the nature of the apical ligand L, which also influences stereochemical aspects, and by the steric requirements of NN′.