Probing outer-sphere adsorption of aqueous metal complexes at the oxide-water interface with resonant anomalous X-ray reflectivity

Resonant anomalous x-ray reflectivity near the Pt L-III edge simultaneously revealed the geometric and spectroscopic structures of Pt(NH3)(4)(2+) ions adsorbed at the quartz(100)-water interface. The derived Pt geometric subprofile shows two discrete outer-sphere'' adsorbed layers, and the interface-specific x-ray absorption edge profile exhibits a significant white-line enhancement compared to the bulk-solution species.