Replacement of the dppm ligand in (
5-C
5H
4(CH
2)
2NMe
2H
+)Ru(dppm)H with two lessdonating 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 (
5-C
5H
4(CH
2)
2NMe
2H
+)Ru(P(OPh)
3)
2H shows no catalytic activity for reduction of carbon dioxideto formic acid.