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| - Transient Resonance Raman Investigation of 4-Iminocyclohexa-2,5-dienylidene and4-Oxocyclohexa-2,5-dienylidene Carbenes in Aqueous Solution
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| - We present transient resonance Raman spectra for the 4-iminocyclohexa-dienylidene and 4-oxocyclohexa-2,5-dienylidene carbene species in aqueous solutions. Comparison of the experimental vibrational frequenciesto values computed from density functional theory calculations suggests that both carbenes are in their tripletstates. Comparison of the structure and properties of the 4-iminocyclohexa-dienylidene to those previouslyfound for several arylnitrenium ions indicates that the imine and cyclohexadienyl character of the4-iminocyclohexa-2,5-dienylidene carbene is similar to the diphenylnitrenium ion. This suggests the smallerC−N bond order and lower cyclohexadienyl character of the triplet 4-iminocyclohexa-2,5-dienylidene carbenecompared to the higher CO bond order and greater cyclohexadienyl character of the triplet 4-oxocyclohexa-2,5-dienylidene carbene is mainly due to the charge delocalization ability of the second hydrogen atom in the−NH2+ moiety. We briefly discuss the structure and properties of these two carbenes and their similaritiesand differences in chemical reactivity.
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