Charge transfer in stage-1OsF6- andMoF6-intercalated graphite compounds

The charge transfer per carbon atom has been studied in stage-1 ${\mathrm{C}}_{\mathrm{n}}$ ${\mathrm{OsF}}_6$ and ${\mathrm{C}}_{\mathrm{n}}$ ${\mathrm{MoF}}_6$. Optical reflection measurements in the range 0.8–3 eV yield a charge transfer per carbon atom of $f_{C\mathrm{}\left(\mathrm{elec}\right)\mathrm{}=0.035\mathrm{}}$ 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 M${\mathrm{F}}_6$ (M=Os,Mo) molecule. These were $f_{M\mathrm{}\left(\mathrm{chem}\right)\mathrm{}=1\mathrm{}}$ and 0.2, respectively. The large discrepancy for ${\mathrm{C}}_{\mathrm{n}}$ ${\mathrm{OsF}}_6$ ($f_{M\mathrm{}\left(\mathrm{chem}\right)\mathrm{}:f_{M\mathrm{}\left(\mathrm{elec}\right)\mathrm{}=3:1\mathrm{}}}$) indicates a rather strong interaction between the carbon atoms and the fluorine atoms of the intercalate.