Organic chemists have striven to realize a wide variety of structural features on the molecular scale in nanocarbons. For example, nanocarbons with spherical, sheetlike, cylindrical, or other exotic structures are usually obtained as mixtures upon applying high energy to appropriate carbon sources . In this context, molecular nanocarbon science, where such substructures are created in a precisely controlled fashion, has attracted substantial attention, given that this approach is fundamentally able to circumvent the problem of the formation of such nanocarbon mixtures .