Study of Sulfur-Sulfur Nonbonded Interactions in Substituted Diphosphine Disulfides by Gas-Phase UV Photoelectron Spectroscopy

Ultraviolet photoelectron spectra (UPS) of tetrasubstituted diphosphine disulfides RR'P(S)-P(S)RR' exhibit peculiar 1:2:1 Splitting pattems in the region 7.5-9.5 eV for which a through-bond coupling mechanism between the sulfur lone pairs lying in the PPS planes is proposed. Further bond orbitals are related to bands at higher I. E. in the UP spectra. © 1981, Walter de Gruyter. All rights reserved.