ELECTRON-AFFINITY AND ULTRAVIOLET-ABSORPTION SPECTRA OF (E)-BETA-NITROSTYRENES

The UV-VIS spectra of (E)-beta-nitrostyrenes were measured. It was stated, by means of CNDO/S calculations, that a long-wavelength band corresponds to the electron transfer from the HOMO to LUMO level, while the short-wavelength one originates from the transitions psi-HOMO - 2 --> psi-LUMO and psi-HOMO - 1 --> psi-LUMO + 1. On the basis of the energy of the former band the electron affinity of these compounds was approximated.