XAS and XRD Studies on Graphite Intercalation Compounds of H2ptcl6

Abstract Graphite intercalation compounds (GICs) of H2PtCl6 were studied using X-ray diffraction and X-ray absorption (XAS) methods. Particularly, the results will be interpreted in correlation to charge transfer. For the orthogonal in-plane lattice following parameters are found: a = 2024 pm, b = 1353 pm, and γ = 90°. The analysis of the EXAFS at the Pt LIII edge yields a slightly decreased Pt-Cl bond length and additionally coordinated Cl atoms in comparison to the pure compound. This is in agreement with results evaluated from the Cl K edge. A small energy shift of 0.25 eV of the Pt LIII edge to higher energies excludes a charge transfer to Pt in the intercalate.