The odd-number cyclo[13]carbon and its dimer, cyclo[26]carbon.
basic_science · Level V
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- Record sourced from PubMed, PMID 38723091.
- Also identified by DOI 10.1126/science.ado1399.
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Abstract
Molecular rings of <i>N</i> carbon atoms (cyclo[<i>N</i>]carbons, or C<i><sub>N</sub></i>) are excellent benchmarking systems for testing quantum chemical theoretical methods and valuable precursors to other carbon-rich materials. Odd-<i>N</i> cyclocarbons, which have been elusive to date, are predicted to be even less stable than even-<i>N</i> cyclocarbons. We report the on-surface synthesis of cyclo[13]carbon, C<sub>13</sub>, by manipulation of decachlorofluorene with a scanning probe microscope tip. We elucidated the properties of C<sub>13</sub> by experiment and theoretical modeling. C<sub>13</sub> adopts an open-shell configuration with a triplet ground state and a kinked geometry, which shows different extents of distortion and carbene localization depending on the molecular environment. Moreover, we prepared and characterized the C<sub>13</sub> dimer, cyclo[26]carbon, demonstrating the potential of cyclocarbons and their precursors as building blocks for carbon allotropes.