Cationic palladium(II)-allyl-complexes containing 2-pyridyldiphenylphosphine: X-ray crystal structure of the binuclear complex [Pd(η 3-2-Me-allyl)(μ-Ph 2PPy)] 2(BF 4) 2. Detection of an intramolecular C(allyl)–H⋯phenyl ring π-interaction

Abstract

Reaction of [PdCl(η 3-2-Me-allyl)(Ph 2PPy)] ( 1) with AgBF 4 affords the new dinuclear cationic complex [Pd(η 3-2-Me-allyl)(μ-Ph 2PPy)] 2(BF 4) 2 ( 2). The X-ray structural analysis of 2 shows that the 2-pyridyldiphenylphosphine ligands adopt a binucleating role through the P and N atoms bridging two independent palladium centres to form an eight-membered metallocyclic ring. One of the anti hydrogen atoms of the allyl moiety was located very close to a phenyl ring of Ph 2PPy indicating the occurrence of a CH/π interaction. Addition of one equivalent of Ph 2PPy to complex ( 2) affords the mononuclear cationic complex [Pd(η 3-2-Me-allyl)(Ph 2PPy) 2](BF 4) ( 3).