Synthesis of Cyclo[18]carbon via Debromination of C<sub>18</sub>Br<sub>6</sub>
作者:Lorel M. Scriven、Katharina Kaiser、Fabian Schulz、Alistair J. Sterling、Steffen L. Woltering、Przemyslaw Gawel、Kirsten E. Christensen、Harry L. Anderson、Leo Gross
DOI:10.1021/jacs.0c05033
日期:2020.7.29
Cyclo[18]carbon (C18, a molecular carbon allotrope) can be synthesized by dehalogenation of a bromocyclocarbon precursor, C18Br6, in 64% yield, by atomic manipulation on a sodium chloride bilayer on Cu(111) at 5 K, and imaged by high-resolution atomic force microscopy. This method of generating C18 gives a higher yield than that reported previously from the cyclocarbon oxide C24O6. The experimental
The electronicspectra of C(18) and C(22) in the 15 150-36 900 cm(-1) range have been detected in the gas phase by a mass-selective resonant two-color two-photon ionization technique coupled to a laser ablation source. The spectra were assigned to several electronic systems of monocyclic cumulenic isomers with a D(9 h) symmetry for C(18) and D(11 h) for C(22), based on time-dependent-density-functional