C(60) and liquid bromine react to form C(60)Br(24), a crystalline compound isolated as a bromine solvate, C(60)Br(24)(Br(2))(x), The x-ray crystal structure defines a new pattern of addition to the carbon skeleton that imparts a rare high symmetry. The parent C(60) framework is recognizable in C(60)Br(24), but sp(3) carbons at sites of bromination distort the surface, affecting conformations of all of the hexagonal and pentagonal rings. Twenty-four bromine atoms envelop the carbon core, shielding the 18 remaining double bonds from addition. At 150 degrees to 200 degrees C there is effectively quantitative reversion of C(60)Br(24) to C(60) and Br(2).
raises the question whether the weak feature seen at 16 500 cm"1 in a single-crystal study of Re2(piv)4Cl27 was due to the presence of very small amounts of the rearranged form. Similar weak, low-energy bands have been observed in the solution spectra of several dirhenium tetracarboxylate bromides and iodides.25 In summary, the changes seen in the visible and infrared spectra for Re2(piv)4Cl2 and Re2(piv)4Br2, both in the polycrystalline state (25)
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