The orientation of phenoxide on oxygen-precovered Mo(110)

Abstract

The orientation of phenoxide (C6H5O) adsorbed on Mo(110) precovered with 0.33 monolayers of oxygen was determined using the near edge X-ray absorption fine structure (NEXAFS) method. The phenoxide intermediate is remarkably stable on this surface, remaining intact up to a temperature of nearly 650 K. The kinetic stability of the adsorbed phenoxide is attributed, in part, to the nearly perpendicular geometry. With the assumption that there is no azimuthal ordering of the adsorbed phenoxide, the angular dependence of peak 1 shows that the phenyl ring is directed away from the surface, with the ring plane making an angle of ~30° with respect to the surface normal. The structure of phenoxide on the Mo(110) precovered with 0.33 monolayers of oxygen on the surface is compared to that determined for organometallic complexes and that proposed for Pt(111). © 1990.