Carbonylbis(triphenylphosphane-κ P )(η 2 -1-vinylpyrrolidin-2-one-κ O )ruthenium(0)

The 1-vinylpyrrolidin-2-one ligand in the title compound, [Ru(C6H9NO)(C18H15P)2(CO)], coordinates to the Ru0 atom with the olefin double bond and the ketone O atom. The Ru0 atom adopts a distorted trigonal–bipyramidal coordination geometry, with the C[triple-bond]O ligand and the ketone O atom occupying the axial positions. The two triphenylphosphane ligands are cis to each other. The olefinic C=C bond is almost coplanar with the Ru0 atom and the two P atoms (maximum deviation of 0.0516 Å from the mean plane defined by the five constituent atoms). The coordinated C=C bond has a length of 1.449 (3) Å, which is significantly longer than that of a free C=C bond (1.34 Å). There are two C—H...π interactions involving neighbouring phenyl rings in the molecule. In the crystal, molecules are linked via two further C—H...π interactions.