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An sp-hybridized molecular carbon allotrope, cyclo[18]carbon

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Science  20 Sep 2019:
Vol. 365, Issue 6459, pp. 1299-1301
DOI: 10.1126/science.aay1914

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An 18-member carbon ring

Carbon's allotropes include molecular species such as C60 and C70 fullerenes. Kaiser et al. now report the assembly of a large carbon ring, cyclo[18]carbon, from organic precursors whose reactivity was controlled by adsorbing them on a sodium chloride surface at 5 kelvin (see the Perspective by Maier). Manipulation, with an atomic force microscope tip, of a cyclocarbon oxide molecule, C24O6, led to elimination of carbon monoxide molecules and formation of the desired all-carbon ring. High-resolution imaging revealed alternating single and triple bonds versus an all-double-bond structure.

Science, this issue p. 1299; see also p. 1245

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