Abstract

Graphite intercalation compounds of main-group acid fluorides have been prepared for the first time utilizing Cl 2 as an oxidizing agent. The reactions of several acid fluorides (GeF 4, PF 5 and BF 3) with graphite and either Cl 2 or Cl 2+HF can produce intercalation salts similar to those obtained by the action of elemental fluorine and the acid fluoride on graphite. These reactions have been followed by X-ray powder diffraction, IR spectroscopy and elemental analysis. The vacuum-stable products of all these reactions are graphite intercalation salts of fluoroanions containing only traces of chlorine. The reaction enthalpies for the appropriate reduction half-reactions have been calculated and found to correlate closely with the extent of intercalation observed. These results are compared with those obtained previously on reactions which generate graphite fluorometallate salts, and are discussed in terms of a simple thermodynamic model for graphite intercalation.

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