Structure of adsorbed organometallic rhodium: model single atom catalysts
Bennett, R. A., McCavish, N., Basham, M., Dhanak, V. and Newton, M. (2007) Structure of adsorbed organometallic rhodium: model single atom catalysts. Physical Review Letters, 98 (5). 056102. ISSN 0031-9007
To link to this item DOI: 10.1103/PhysRevLett.98.056102
We have determined the structure of a complex rhodium carbonyl chloride [Rh(CO)(2)Cl] molecule adsorbed on the TiO2 (110) surface by the normal incidence x-ray standing wave technique. The data show that the technique is applicable to reducible oxide systems and that the dominant adsorbed species is undissociated with Rh binding atop bridging oxygen and to the Cl found close to the fivefold coordinated Ti ions in the surface. A minority geminal dicarboryl species, where Rh-Cl bond scission has occurred, is found bridging the bridging oxygen ions forming a high-symmetry site.