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A Möbius cyclo[9]carbon
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Möbius-type conjugated systems have long been predicted but remain experimentally elusive in purely carbon molecules. Here we report the on-surface synthesis and characterization of a Möbius-type cyclo[9]carbon, using STM tip-induced reactions of a designed precursor (C9Cl10) on the NaCl/Au(111) surface. Bond-resolved AFM and DFT simulations confirm a nonplanar cyclic geometry. Interestingly, two distinct electronic configurations of C9 are directly observed, including a nonplanar singlet state and a planar triplet state stabilized by adsorption-site-dependent interactions. Negative ion resonance imaging combined with Dyson orbital analysis further reveals clear helical orbital character in the singlet species, whereas the triplet state exhibits conventional cyclocarbon orbital symmetry. These results establish cyclo[9]carbon as the first experimentally realized Möbius-type cyclocarbon.
Title: A Möbius cyclo[9]carbon
Description:
Möbius-type conjugated systems have long been predicted but remain experimentally elusive in purely carbon molecules.
Here we report the on-surface synthesis and characterization of a Möbius-type cyclo[9]carbon, using STM tip-induced reactions of a designed precursor (C9Cl10) on the NaCl/Au(111) surface.
Bond-resolved AFM and DFT simulations confirm a nonplanar cyclic geometry.
Interestingly, two distinct electronic configurations of C9 are directly observed, including a nonplanar singlet state and a planar triplet state stabilized by adsorption-site-dependent interactions.
Negative ion resonance imaging combined with Dyson orbital analysis further reveals clear helical orbital character in the singlet species, whereas the triplet state exhibits conventional cyclocarbon orbital symmetry.
These results establish cyclo[9]carbon as the first experimentally realized Möbius-type cyclocarbon.
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