Orientational ordering of nonplanar phthalocyanines on Cu(111): strength and orientation of the electric dipole moment.

摘要: In order to investigate the orientational ordering of molecular dipoles and associated electronic properties, we studied adsorption chlorogallium phthalocyanine molecules (GaClPc, $\mathrm{Pc}={\mathrm{C}}_{32}{\mathrm{N}}_{8}\mathrm{H}_{16}{}^{\ensuremath{-}2}$) on Cu(111) by using x-ray standing wave technique, photoelectron spectroscopy, quantum mechanical calculations. We find that for submonolayer coverages majority GaClPc adsorb in a Cl-down configuration forming covalent bond substrate. For bilayer data indicate coexistence Cl-up configurations The structural details established both cases supplementary calculations adsorbate system allow us analyze observed change work function.