Photoelectron spectra of Group 5 compounds. Part IV. A study of the E–X bond in R3EX compounds (R = Me or F; E = N or P; X = O or S)

Abstract

The He(I) photoelectron (p.e.) spectra of the isoelectronic C_3v compounds Me₃NO, Me₃PO, Me₃PS, and F₃PS are discussed and assigned by comparison with the p.e. spectra of the parent bases R₃P and R₃N and with reference to CNDO and EHMO calculations. Bond descriptions for the E–X multiple bonds (σ donation, p_π–d_π back donation) have been critically revised taking into account the variation of the central atom E, of the acceptor X, and of the substituent R, and symmetry arguments. Inductive, hyperconjugative, and d-orbital effects have been determined by the CNDO method.