title: Synthesis and platinum complexes of an alane-appended 1,1'-bis(phosphino)ferrocene ligand.
abstract: An aryldimethylalane-appended analogue of 1,1'-bis(diphenylphosphino)ferrocene, FcPPAl, was prepared, and reaction with [Pt(nb)3 ] (nb=norbornene) afforded [Pt(η(2) -nb)(FcPPAl)] (1). Heating a solution of 1 to 80 °C resulted in crystallization of [{Pt(FcPPAl)}2 ] (2), whereas treatment of 1 with C2 H4 , C2 Ph2 , H2 , or CO provided [PtL(FcPPAl)] [L=C2 H4 (3), C2 Ph2 (4)], [PtH2 (FcPPAl)] (5), and [Pt(CO)(FcPPAl)] (6). In all complexes, the FcPPAl ligand is coordinated through both phosphines and the alane. Whereas 2 adopts a T-shaped geometry at platinum, 3-5 are square-pyramidal, and 6 is distorted square-planar. The hydride and carbonyl complexes feature unusual multicenter bonding involving platinum, aluminum, and a hydride or carbonyl ligand.
authors.affiliation: Department of Chemistry and Chemical Biology, McMaster University, 1280 Main St. West, Hamilton, Ontario, L8S 4M1 (Canada).
authors.forename: Bradley E
authors.initials: BE
authors.lastname: Cowie
authors.forename: Fu An
authors.initials: FA
authors.lastname: Tsao
authors.forename: David J H
authors.initials: DJ
authors.lastname: Emslie
keywords: alanes; coordination chemistry; donor-acceptor systems; ligand design; platinum