Synthesis and single-crystal X-ray structure of a highly symmetrical C60 derivative, C60Br24

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)...

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Published in:Science (American Association for the Advancement of Science) 1992-05, Vol.256 (5058), p.822-825
Main Authors: TEBBE, F. N, HARLOW, R. L, CHASE, D. B, THORN, D. L, CRESTON CAMPBELL, G. JR, CALABRESE, J. C, HERRON, N, YOUNG, R. J, WASSERMAN, E
Format: Article
Language:English
Subjects:
Alloys
Carbon allotropes
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Molecular structure
Physics
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
X-ray crystallography
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Summary: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).
ISSN:0036-8075
1095-9203
DOI:10.1126/science.256.5058.822