Effect of intercalate desorption on the two- dimensional structure of graphite-bromine

By single crystal X-ray diffraction, the desorption of stage-2 C₇Br to an overall stoichiometry of C₃₅Br was found to result in a change in the inplane structure while the in-plane unit cell was maintained. The nearest-neighbor distances between the bromine atoms are 2.29, 2.43, 2.10 and 3.48 Å. The last distance is considerably larger than corresponding one (2.86 Å) before desorption. The small distance of 2.10 Å suggests that the atoms may be in two layers or two phases, indicating that desorption decreased the in-plane bromine concentration to half of that of stage-2 C₇Br.