The syntheses of C6CH2.– and the corresponding carbenoid cumulene C6CH2 in the gas phase

Abstract

The ion (C₆CH₂).^– is formed in the gas phase by the process –C≡C–C≡C–C≡C–CH₂OEt → (C₆CH₂).^– + EtO., and charge stripping of the product radical anion yields the carbenoid neutral C₆CH₂; this can be either a singlet (the ground state), which is best represented as the carbene :CCCCCCCH₂, or a triplet; the adiabatic electron affinity and the dipole moment of the carbenoid neutral are calculated to be 2.82 eV and 7.33 D respectively.