Photochemistry of (η3-allyl)tricarbonyecobaet in frozen gas matrices at 12 K. Infrared spectroscopic evidence for the formation of (η3-allyl) dicarbonylcobalt, (η3-allyl)dicarbonyl(dinitrogen)cobalt, (σ-allyl)tetracarbonylcobalt, and tetracarbonylcobalt complexes
Identifieur interne : 004813 ( Istex/Curation ); précédent : 004812; suivant : 004814Photochemistry of (η3-allyl)tricarbonyecobaet in frozen gas matrices at 12 K. Infrared spectroscopic evidence for the formation of (η3-allyl) dicarbonylcobalt, (η3-allyl)dicarbonyl(dinitrogen)cobalt, (σ-allyl)tetracarbonylcobalt, and tetracarbonylcobalt complexes
Auteurs : Antony J. Rest ; David J. TaylorSource :
- Journal of the Chemical Society, Dalton Transactions [ 0300-9246 ] ; 1983.
Abstract
Infrared spectroscopic evidence is presented to show that photolysis of [Co(η3-allyl)(CO)3] in gas matrices at 12 K gives [Co(η3-allyl)(CO)2](in Ar or CH4), [Co(η3-allyl)(CO)2(N2)](in N2), and [Co(σ-allyl)(CO)4] followed by [Co(CO)4](in CO). The detection of [Co(η3-allyl)(CO)2] is consistent with the results of kinetic studies, which have been interpreted in terms of a dissociative path and a co-ordinatively unsaturated intermediate in the thermal CO substitution reactions, and theoretical calculations which show a low M–C(O) bond order a detection of [Co(σ-allyl)(CO)4] and the reversibility of the reaction [Co(η3-allyl)(CO)3]+ CO ⇄[Co(σ-allyl)(CO)4] suggest that there may be a contribution to the reactivity of [Co(η3-allyl)(CO)3] from the hitherto neglected associative path.
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DOI: 10.1039/DT9830001291
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<front><div type="abstract">Infrared spectroscopic evidence is presented to show that photolysis of [Co(η3-allyl)(CO)3] in gas matrices at 12 K gives [Co(η3-allyl)(CO)2](in Ar or CH4), [Co(η3-allyl)(CO)2(N2)](in N2), and [Co(σ-allyl)(CO)4] followed by [Co(CO)4](in CO). The detection of [Co(η3-allyl)(CO)2] is consistent with the results of kinetic studies, which have been interpreted in terms of a dissociative path and a co-ordinatively unsaturated intermediate in the thermal CO substitution reactions, and theoretical calculations which show a low M–C(O) bond order a detection of [Co(σ-allyl)(CO)4] and the reversibility of the reaction [Co(η3-allyl)(CO)3]+ CO ⇄[Co(σ-allyl)(CO)4] suggest that there may be a contribution to the reactivity of [Co(η3-allyl)(CO)3] from the hitherto neglected associative path.</div>
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