Abstract
Despite their similarities, the fluorides WF 6 and MoF 6 behave differently when reacting on graphite. On simple contact with graphite at room temperature, MoF 6 gives a second stage intercalation compound (blue-black) after 48 hours and a first stage after one week. Conversely, WF 6 intercalation occurs only if gaseous or liquid Cl 2, F 2 or HF is added in the reaction vessel: the richest compound (second stage) is obtained in the presence of HF. Preliminary thermogravimetric analyses of the nth stage fluoride-graphite compounds indicate the formulate C (11 ± 1) n MoF 6 and C (14 ± 1) n WF 6. X-ray patterns of these intercalates show similar series of 00 l lines with identity periods along the c axis correlated by I c = 5.0 + 3.35n A ̊ . Therefore, the spacing of two layers adjacent to intercalated fluoride is about 5 Å, close to the smallest size 4.78 Å calculated for WF 6 and MoF 6 molecules.
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