Photoelectron spectra of the phospha-alkynes: 3,3-dimethyl-1-phosphabutyne ButCP and phenylphosphaethyne, PhCP

Abstract

He(I) photoelectron spectra of the phospha-alkynes Bu^tCP and PhCP have been obtained. The spectra have been assigned by comparison with spectra of related species and with the aid of ab initio SCF molecular orbital calculations. The first ionisation potentials are 9.61 and 8.68 eV for Bu^tCP and PhCP respectively. These correspond to electron removal from orbitals with essentially π(CP) bonding character.