"Synthesis of the acidic dihydrogen complexes trans-[Ru(H2)(CN)L2] and trans-[Ru(H2)(CNH)L2]2+ where M= Fe, Ru, Os and L= dppm, dppe, dppp, depe and dihydrogen substitution by the trifluoromethylsulfonate anion to give or trans-[Ru(OTf)(CN)L2] or trans-[Ru(OTF)(CNH)L2]OTf"