Charge transfer in stage-1 OsF6- and MoF6-intercalated graphite compounds

The charge transfer per carbon atom has been studied in stage-1 CnOsF6 and CnMoF6. Optical reflection measurements in the range 0.83 eV yield a charge transfer per carbon atom of fC(elec)=0.035 and 0.029, respectively. The shifts in the energy of the Raman lines with the symmetry & are correlated with a difference of 0.01 in the electronic charge transfer per carbon for these compounds. These results are compared with recent ESR susceptibility measurements on these compounds which yield the chemical charge transfer per intercalated MF6 (M=Os,Mo) molecule. These were fM(chem)=1 and 0.2, respectively. The large discrepancy for CnOsF6 (fM(chem):fM(elec)=3:1) indicates a rather strong interaction between the carbon atoms and the fluorine atoms of the intercalate.