Nature of Metal-Olefin Bond in Neutral η3-Allyl (olef in)platinum(II) Complexes. In-plane Olefin Coordination and Stability Trend Unusually Weakly Dependent on Electronic Effect of Olefin-substituent

Relative olefin coordination ability in Pt(η3-CH2CMeCH2)(CH2=CHC6H4Y)(C6F5)(2)was determined to show the stability trend unusually weakly dependent on the electronic property of the substituent Y. The crystal structure of the styrene complex 2 (Y= H) revealed the C=C bond oriented parallel to the coordination plane. The nature of Pt-olefin bond in 2 has been discussed in terms of these stability and structural trends.