Photoelectron (He I) spectroscopic study of styrylpyridines

Abstract

The He I photoelectron spectra of the three isomeric trans-styrylpyridines and some of their derivatives are reported. The assignments were made with the aid of CNDO/S calculations coupled with perturbational molecular orbital analysis, and substituent effects were compared with available data on benzenes and stilbenes. The possible correlation of these results with the electronic spectra and photochemical behaviour of azastilbenes is briefly discussed.