Helvetica Chimica Acta p. 220 - 223 (1984)
Update date:2022-08-10
Topics:
Albrecht, Bruno
Allan, Michael
Haselbach, Edwin
Neuhaus, Louis
Vinylamine 1 was prepared by thermolysis of cyclobutylamine and its photoelectron spectrum was measured.I1a = 8.20 eV and I1v = 8.65 eV were found, the dominant vinrational progression (ν<*> = 725 cm-1) indicating that in the course of 1(X) -> 1+(X<*>) flattening around the N-atom occurs.The Franck-Condon profile of this band, however, suggests that a skeletal mode of ν<*> ca. 1400 cm-1 (observed also in the iso-?-electronic systems vinyl-alcohol-cation and allyl radical) may also be excited.Comparison with the data for the isomer acetaldehyde-imine 2 and its cation 2+ shows that the isomer couple 1/2 constitutes a further notable example for a relative thermochemical stability inversion on going from neutrals to the cations.
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