Carbon Dioxide Chemistry:  Characterization of the Carbon Dioxide Reaction Product of a Dinuclear Titanium Complex

Reaction of [CpTi(mu-H)](2)(mu-eta(5):eta(5)-C10H8) with CO2 (3 atm) leads to the formation of the bis(formato) complex [CpTi(mu-eta(1)-(O)CHO)](2)(C10H8) (1). Complex 1 contains monodentate bridging formate ligands. The difference between vibrational frequencies nu(as)(CO2) and nu(s)(CO2) is 455 cm(-1), the largest ever observed for a monodentate formate ligand.