Six-coordinate ruthenium(II) complexes containing both formate and alkenyl ligands. Crystal structure of Ru(O 2CH)(CO)(HCCHPh)(PPh 3) 2

Abstract

The formate complexes Ru(O 2CH)(CO)(RCCHR′)(PPh 3) 2 have been obtained in qantitative yield from the reaction of the unsaturated complexes Ru(CO)Cl(RCCHR′)(PPh 3) 2 with sodium formate in CH 2Cl 2/MeOH mixtures. The synthesized complexes contain the formate ligand η 2-coordinated to metal. The structure of the complex Ru(O 2CH)(CO)(HCCHPh)(PPh 3) 2 has been established by an X-ray diffraction study. The molecule consist of an distorted octahedral ruthenium atom coordinated by two PPh 3 ligands in the axial positions and the other ligands in the equatorial plane. The η 2-coordinated formate ligand is not symmetric, and has CO distances of 1.21(2) and 1.43(2) Å.