UV-Untersuchungen an Stilben, Benzalanilin, Azobenzol, Azoxybenzol und einigen kristallinflüssigen Alkoxyderivaten

Abstract

The π-electronic spectra of stilbene, benzalanilin, azobenzene and azoxybenzene are discussed and assigned. Starting point for the assignments are the π-states of stilbene calculated with inclusion of first order configuration interaction using the PARISER-PARR method. Absorption measurements on homogeneously ordered layers of some liquid cristaline alkoxyderivatives of benzalanilin, azobenzene and azoxybenzene make the assignments easier and safer. The UV-absorption of benzalanilin and azobenzene in sulfuric acid speaks for a symmetrical middle group of the azobenzene ion.