Observations on residues from lamellar reactions of graphite

Abstract

The residual bromine held in graphite at zero bromine pressure has been shown to decrease with the rate of pressure reduction after prior bromination. The amount, however, cannot be reduced below a certain minimum. The amount in excess of this minimum can be removed at 450°C and is believed to be trapped by collapsing layers during the pressure reduction. Graphite containing its maximum residue of CrO 2Cl 2 does not intercalate Br 2 but does intercalate half the amount of ICI taken up by pure graphite.