Ultraviolet photoelectron spectra of 2-haloanilines

The He I and He II spectra of 2-haloanilines were measured and interpreted in terms of a composite-molecule model. The assignments have established th e relative ionization energy order of the pi MOs (associated with the benze ne moiety) and the in-plane nitrogen and halogen lone-pairs. Comparison of the He I and He II cross-section ratios, ab initio calculations using the H F-6-31G** model and comparisons of the linear correlation of the in-plane l one-pairs and Allred electronegativities for the halobenzenes and haloanili nes reinforced the preferred assignments. (C) 1999 Elsevier Science B.V. Al l rights reserved.