A photoelectron spectroscopic study of the (FBS)n system (n= 1–3)

Abstract

The unstable species FBS, (FBS)₂, and (FBS)₃ are produced in high yield by pyrolysis reactions of various sulphur fluorides over boron. FBS and (FBS)₂ can be produced in a direct flow system and (FBS)₃ by revaporising a trapped monomer–dimer mixture. He(I) photoelectron (p.e.) spectra are reported for these species, the identities of which are confirmed by in situ quadrupole mass spectrometry. Ab initio molecular orbital calculations, including perturbation corrections to Koopmans theorem, are consistent with the identifications, assist with the assignments of the p.e. spectra, and provide information on their electronic structures.