Attenuation of Intramolecular Ru−H···H−N Dihydrogen Bonding in Aminocyclopentadienyl Ruthenium Hydride Complexes Containing Phosphite Ligands

Replacement of the dppm ligand in (η 5 -C 5 H 4 (CH 2 ) 2 NMe 2 H + )Ru(dppm)H with two less donating triphenyl phosphite ligands reduces the strength of the intramolecular Ru−H···H−N dihydrogen bond to such an extent that it is hardly evidenced by NMR measurements. Unlike its dihydrogen-bonded dppm analogue, the triphenyl phosphite complex (η 5 -C 5 H 4 (CH 2 ) 2 NMe 2 H + )Ru(P(OPh) 3 ) 2 H shows no catalytic activity for reduction of carbon dioxide to formic acid.