INVESTIGATIONS OF THE FACTORS AFFECTING THE STABILITY OF DIHYDROGEN ADDUCTS OF PLATINUM(II)

The preparation and study of Pt(II) H-2 adducts and Pt(IV) dihydride c omplexes are described. The species of interest are generated by proto nation of hydridoplatinum(II) complexes of the type trans-(PCy3)(2)Pt( H)X [X = SiH3, H, CH3, Ph, Cl, Br, I, CN, CF3SO3] and [trans-(PCy3)(2) Pt(H)L][BAr4f] [L = CO, 4-picoline; BAr4f = B(3,5-C6H3(CF3)(2))(4)]. T he proton attacks one of three different sites on these complexes (hyd ride, platinum, or the trans ligand), depending on which ligand is tra ns to hydride. These studies reveal several factors affecting the stab ility and reactivity of Pt(II) sigma adducts, which thus have implicat ions for C-H activation by Pt(II).