The ruthenium complexes [Ru(H3CC(CH2PPh2)(3)-kappa(3)-P)(NCCH3)(3)](OTf)(2) (1, (H3CC(CH2PPh2)(3) = triphos) and [Ru(N(CH2PPh2)(3)-kappa(3)-P)(NCCH3)(3)](OTf)(2) (2, N(CH2PPh2)(3) = N-triphos) have been evaluated as homogeneous ionic hydrogenation catalysts ...