Bonding mode of a bifunctional P approximately Si-H ligand in the ruthenium complex "Ru(PPh2CH2OSiMe2H)3".
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.
Montiel-Palma
Virginia
V
Centro de Investigaciones Quimicas, Universidad Autónoma del Estado de Morelos, Cuernavaca, Morelos 62210, Mexico.
Piechaczyk
Olivier
O
Picot
Alexandre
A
Auffrant
Audrey
A
Vendier
Laure
L
Le Floch
Pascal
P
Sabo-Etienne
Sylviane
S