The UV absorption and He¹and He¹¹photoelectron spectra of some (<i>E</i>)‐ and (<i>Z</i>)‐α‐oxo oxime<i>O</i>‐methyl ethers and related compounds

Abstract

Abstract The He 1 and He 11 photoelectron spectra, as well as the UV absorption spectra, of a series of α‐oxo oxime O ‐methyl ethers have been measured and assigned with the help a qualitative molecular orbital model, including through‐bond and through‐space interaction between lone‐pair‐type orbitals on the separate chromophore moieties. The observed dependence of the UV absorption frequency of both the n → π* and π → π* transitions on the intercarbonyl‐iminyl dihedral angle Φ is explained in terms of the angular dependence of occupied and unoccupied molecular orbitals.