Time-resolved IR spectroscopy has been used to study the oxidative addition of H2 to Fe(CO)4 and its reverse reaction, the reductive elimination of H2 from Fe(CO)4H2, in the gas phase. The rate constant for oxidative addition of H2 shows little temperature dependence, indicating that if there is an activation barrier for this process it is small (< 4 kcal mol-1). The activation barrier for the reductive elimination of H2 is 20.5 ± 2.1 kcal mol-1. these measurements, the average of the dissociation energies for the two Fe-H bonds in Fe(CO)4H2 is calculated to be 62 ± 2 kcal mol-1. Kinetic measurements employing D2 indicate small kinetic isotope effects for both the oxidative addition and reductive elimination reactions.
ASJC Scopus subject areas
- Colloid and Surface Chemistry