A grossly warped nanographene and the consequences of multiple odd-membered-ring defects

Katsuaki Kawasumi, Qianyan Zhang, Yasutomo Segawa, Lawrence T. Scott, Kenichiro Itami

Research output: Contribution to journalArticlepeer-review

456 Citations (Scopus)


Graphite, the most stable form of elemental carbon, consists of pure carbon sheets stacked upon one another like reams of paper. Individual sheets, known as graphene, prefer planar geometries as a consequence of the hexagonal honeycomb-like arrangements of trigonal carbon atoms that comprise their two-dimensional networks. Defects in the form of non-hexagonal rings in such networks cause distortions away from planarity. Herein we report an extreme example of this phenomenon. A 26-ring C 80 H 30 nanographene that incorporates five seven-membered rings and one five-membered ring embedded in a hexagonal lattice was synthesized by stepwise chemical methods, isolated, purified and fully characterized spectroscopically. Its grossly warped structure was revealed by single-crystal X-ray crystallography. An independent synthetic route to a freely soluble derivative of this new type of 'nanocarbon' is also reported. Experimental data reveal how the properties of such a large graphene subunit are affected by multiple odd-membered-ring defects.

Original languageEnglish
Pages (from-to)739-744
Number of pages6
JournalNature Chemistry
Issue number9
Publication statusPublished - Sept 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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