EXAFS STUDY OF GRAPHITE INTERCALATED WITH METAL CHLORIDES

Synchrotron EXAFS spectra of transition metal chlorides intercalated i nto a graphite matrix (1) Gr()CrCl(3), (2) Gr(*)FeCl(3), (3) Gr(*)CoC l(2), (4) Gr()NiCl(2), (5) Gr(*)CuCl(2) and (6) chemically reduced Gr ()Cr, and X-ray powder data confirm the structure of hexagonal layers of the 'guest' chlorides stacked in the graphite matrix. The two near est coordination spheres of the metal atoms in (1)-(5) corresponding t o M-Cl (2.32-2.46 Angstrom) and M ... M distances (3.3-3.6 Angstrom) a gree well with the crystal structures of pure MCl(n). In (6), zerovale nt Cr atoms are probably eta(6)-coordinated to graphite hexagons; no C r-Cr contacts were observed.