title: Halogens in competition: electronic structure of mixed dihalobenzenes.
abstract: The electronic structure of all isomeric dihalobenzenes C6H4XY (X, Y = Cl, Br, I) has been investigated by HeI/HeII photoelectron spectroscopy, Green's functions calculations, and comparison with the spectra of related dihalobenzenes C6H4X2 (X = Cl, Br, I). The careful analysis of measured pi orbital and halogen lone pair ionization energies enabled us to describe substituent effects in terms of resonance, inductive, steric, and spin-orbit coupling interactions.
authors.affiliation: Department of Chemistry, National University of Singapore, Singapore 117543, Singapore. chmigorn@nus.edu.sg
authors.forename: Igor
authors.initials: I
authors.lastname: Novak
authors.forename: Branka
authors.initials: B
authors.lastname: Kovac