Preparation and characterization of C60Br6 and C60Br8

Fullerenes

“…70 Total energy calculations for exohedrally placed bromine 110 suggested that C 6 oBr should be successfully synthesized, and subsequent to these calculations CeoBr* compounds have been successfully synthesized. 40 However, because of the high electronegativity of C60, it is not likely that holes would be created in the H u -derived C 60 HOMO level, also in agreement with experiment. 54 Fermi surface calculations for K 3 C 60 indicate a hole Fermi surface around the f-point that contributes about 12% to the density of states at the Fermi surface.…”

“…39 However, it is not known whether in the case of C 6 oH 6 o all the H-bonds are directed radially outward, or whether some may perhaps be directed radially inward and be endohedrally bonded. 31 A variety of bromine-doped fullerenes have also been prepared, 40 though the doping arrangement in the case of bromine may well be different from that for fluorine and hydrogen.…”

Disorder and the molecular packing of C60buckminsterfullerene: a direct electron-crystallographic analysis

“…For example, accurate bond lengths for the C60 molecule had only been obtained crystallographically from molecular derivatives (Hawkins, Mayer, Lewis, Loren & Hollander, 1991;Fagan, Calabrese & Malone, 1991;Birkett, Hitchcock, Kroto, Taylor & Walton, 1992;Tebbe et al, 1992) until the low-temperature structure was solved (Liu, Lu, Kapes & Ibers, 1991) but similar bond lengths had been obtained previously by nuclear magnetic resonance (NMR) spectral simulation (Johnson, Bethune & Yannoni, 1992). In addition to the lattice perturbations already mentioned, there is yet another possible disorder that could seriously affect the outcome of a crystallographic analysis of the room-temperature form.…”

Crystal engineering a linear polymer of C60 fullerene via supramolecular pre-organization

“…It is stable to aqueous KMnO 4 and HNO 3 but a moderate excess of bromine gradually produces C 60 Br 8 (identified by isolation and IR spectroscopy). 19 On a platinum electrode, an irreversible anodic wave was observed at the same potential as C 60 (ca. 1.4 V vs. Fc/Fc + ) suggesting irreversible decomposition.…”