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- Title
Methods for the chemical synthesis of carbon nanotubes: an approach based on hemispherical polyarene templates.
- Authors
Scott, Lawrence T.
- Abstract
Hemispherical polyarenes represent attractive templates from which carbon nanotubes of the same diameter and rim structure (chirality) might be grown by repetitive annulation reactions. The resulting sin- gle-index (n,m) nanotubes would have one end open and the other end capped by the original template. Efforts in the author's laboratory to synthesize (5,5) and (6,6) nanotube end-caps are described. Nitroeth- ylene is shown to serve well as a "masked acetylene" for the conversion of polyarene bay regions into new unsubstituted benzene rings by a Diels-Alder cycloaddition/aromatization process. Benzyne reacts similarly, both in solution and in the gas phase. These annulation reactions are proposed as methods for elongating large-diameter templates that have bay regions on their rims into structurally uniform, single-walled carbon nanotubes. Unfortunately, the bay regions on the strongly curved rim of the small-diameter (5,5) nanotube end-cap 3 resist Diels-Alder cycloadditions with both nitroethylene and benzyne. Pentabenzocorannulene (14) is proposed as a promising candidate for surface-catalyzed cyclodehydrogenation to a surface-bound hemispherical polyarene that could serve as a template for synthesis of pure (5,5) carbon nanotubes.
- Subjects
CHEMICAL synthesis; CARBON nanotubes; CHEMICAL reactions; AROMATIC compounds; NITROETHYLENE
- Publication
Pure & Applied Chemistry, 2017, Vol 89, Issue 6, p809
- ISSN
0033-4545
- Publication type
Article
- DOI
10.1515/pac-2016-1222