Co-ordinatively unsaturated diphosphine platinum(II) alkyl cations: a new class of β-agostic complexes

Abstract

Treatment of tris(norbornene)platinum with diphosphines and subsequent protonation affords a series of cationic complexes [Pt(C₇H₁₁)(L₂)]⁺(L₂= peralkyldiphosphine) in which the norbornyl ligand binds to platinum viaσ-alkyl and β-C–H agostic interactions; the strength of the latter bond varies and has been characterised by n.m.r. and X-ray structure analysis.