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

Abstract

He(I) photoelectron spectra of the phospha-alkynes ButCP 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 ButCP and PhCP respectively. These correspond to electron removal from orbitals with essentially π(CP) bonding character.