ChemInform Abstract: Preparation and Structural Comparison of the Ruthenium(0) Derivatives Ru(DMPE)2L (L: PMe3, CO, DMPE: 1,2-Bis(dimethylphosphino)ethane). .
Abstract
The thermal reaction of the Ru(II) complex (I) with PMe3 results in the formation of the trimethylphosphine Ru(0) complex (II) with a square-pyramidal geometry in which PMe3 occupies the apical position.
ChemInform Abstract
The thermal reaction of the Ru(II) complex (I) with PMe3 results in the formation of the trimethylphosphine Ru(0) complex (II) with a square-pyramidal geometry in which PMe3 occupies the apical position. Displacement of PMe3 by CO occurs at 25°C producing the trigonal-bipyramidal derivative (III). Neopentyl isocyanide slowly displaces PMe3 at higher temp. to give the isocyanide derivative (IV). Molecular and crystal structures of (II) (space group Pnam, Z=4) and (III) (space group Pbca, Z=16) are determined by X-ray analysis. On the basis of kinetic data, the mechanism of PMe3 Substitution is discussied. (II) undergoes associative substitution with CO but dissociative Substitution with other larger ligands.
