The electronic nature of the -Pn=Pn- derivatives (Pn = P/As). New insight,in the light of UV photoelectron spectroscopy [1]

The ordering of IEs in diphosphene is not clearly established and no inform ation has been reported in the literature concerning the arsenic analogues. We have investigated the electronic properties of two diarsenes using UV P hotoelectron Spectroscopy and by calculation (DFT). Comparison between the phosphorus and arsenic spectra has also been made. From this work it has be en determined that n(+) and pi orbitals are closed shell and their energy s eparation depends on the substituent (more separated considering aryl subst ituent). (C) 2001 Elsevier Science B.V. All rights reserved.