Structure and protonation of the bis-ethylene adduct [Pt(μ-PBu t 2 )(η 2 -CH 2 CH 2 )] 2 . Pt–H–P agostic interaction and proton scrambling

The bis-ethylene derivative [Pt(micro-PBu(t)(2))(eta(2)-CH(2)=CH(2))](2) was prepared and characterized by X-ray diffraction; its protonation affords [Pt(2)(micro-PBu(t)(2))(micro-PBu(t)(2)H)(eta(2)-CH(2)=CH(2))(2)](CF(3)SO(3)), with a rarely observed P-H-M agostic proton in rapid exchange with those of the adjacent ethylene molecule.