title: Bonding mode of a bifunctional P approximately Si-H ligand in the ruthenium complex "Ru(PPh2CH2OSiMe2H)3".
abstract: The phosphinosilane compound PPh 2CH 2OSiMe 2H is potentially a bifunctional P approximately Si-H ligand. By treatment with the Ru (II) precursor RuH 2(H 2) 2(PCy 3) 2, the complex Ru(PPh 2CH 2OSiMe 2H) 3 ( 2), resulting from the coordination of three ligands and the displacement of two PCy 3 and two dihydrogen ligands, was formed. The different bonding modes for each of the three bifunctional P approximately Si-H ligands are discussed on the basis of multinuclear NMR, X-ray diffraction, and density functional theory studies. One ligand acts as a monodentate phosphine ligand with a pendant Si-H group, whereas the two others act as bidentate ligands with different Si-H bond activations. Indeed, an intermediate structure between two arrested forms 2a and 2b can be proposed: a dihydrido(disilyl)ruthenium(IV) species (form 2a) resulting from two Si-H oxidative additions or a hydrido(silyl)ruthenium(II) species (form 2b) presenting an agostic Si-H bond and only one oxidative addition.
authors.affiliation: Centro de Investigaciones Quimicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62210, Mexico.
authors.forename: Virginia
authors.initials: V
authors.lastname: Montiel-Palma
authors.forename: Olivier
authors.initials: O
authors.lastname: Piechaczyk
authors.forename: Alexandre
authors.initials: A
authors.lastname: Picot
authors.forename: Audrey
authors.initials: A
authors.lastname: Auffrant
authors.forename: Laure
authors.initials: L
authors.lastname: Vendier
authors.forename: Pascal
authors.initials: P
authors.lastname: Le Floch
authors.forename: Sylviane
authors.initials: S
authors.lastname: Sabo-Etienne