I  U  P  A  C

News & Notices

Organizations & People

Standing Committees







Links of Interest

Search the Site

Home Page












Provisional Recommendations

Organic and Biomolecular Chemistry Division
Commission on Nomenclature of Organic Chemistry


Nomenclature for the C60-Ih and C70-D5h(6) Fullerenes

Fullerenes are a new allotrope of carbon characterized by a closed cage structure consisting of an even number of three coordinate carbon atoms devoid of hydrogen atoms. This class was originally limited to closed-cage structures with twelve isolated five-membered rings, the rest being six-membered rings.
Although it was recognized that organic ring nomenclature could be used for these structures, the resulting names would be extremely unwieldy and inconvenient for use. At the same time, it was also recognized that established organic principles could be used, or adapted, to provide a consistent nomenclature for this unique class of compounds based on the class name fullerene. However, it was necessary to develop an entirely new method for uniquely numbering closed cage systems.
This paper describes IUPAC recommendations for naming and uniquely numbering the two most common fullerenes with isolated pentagons, the icosahedral C60 fullerene and the D5h-C70 fullerene. It also describes adaptations of organic nomenclature principles for naming derivatives of fullerenes with nonclosed cage structures, heterofullerenes, derivatives formed by substitution of hydrofullerenes, and the fusion of organic rings or ring systems to the fullerene cage. Finally, this paper suggests methods for describing structures consisting of two or more fullerene units and for denoting configurations of chiral fullerenes and their derivatives.

> Download full text of the Provisional Recommendations (pdf file - 1.34MB)

Comments by 30 November 2001
To Dr. Warren H. Powell
1436 Havencrest Court
Columbus, Ohio 43220-3841, USA

Tel.: +1-614-451-1830
E-mail: [email protected]

> Project Description

Page last modified 12 April 2001.
Copyright ©2001 International Union of Pure and Applied Chemistry.
Questions or comments about IUPAC, please contact, the Secretariat.
Questions regarding the website, please contact Web Help.