Abstract
Induced π-electron ring currents and relative diamagnetic susceptibilities of planar singlet π-electron monocyclic π2 carbenes are calculated in the coupled variant of perturbation theory in the CNO method. It is shown that the parity theorem holds for charged planar σ2 and π2 carbenes formally generated by the detachment of a proton or a hydride ion from alternant hydrocarbons. This leads, in such carbenes, to the same energies of singlet-singlet and singlet-triplet transitions, electric polarizabilities, conjugation energies, π-electron ring currents, diamagnetic susceptibilities and current contributions to chemical shifts, whereas the charge contributions to the latter are of opposite signs.
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Donbas State Academy of Building and Architecture, 1 Derzhavina St., 339023 Makeevka, Donetsk Region, Ukraine. Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 32, No. 3, pp. 157–162, May–June, 1996. Original article submitted December 5, 1994.
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Vysotskii, Y.B., Zaikovskaya, Y.V. & Gorban', O.A. Electronic structure and aromaticity of planar singlet π-electron monocyclic π2 carbenes. Theor Exp Chem 32, 139–143 (1996). https://doi.org/10.1007/BF01373238
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DOI: https://doi.org/10.1007/BF01373238