Editing Fullerene (section)

==Systematic naming==
According to the [[IUPAC nomenclature of organic chemistry|IUPAC]], to name a fullerene, one must cite the number of member atoms for the rings which comprise the fullerene, its [[symmetry point group]] in the [[Schoenflies notation]], and the total number of atoms. For example, buckminsterfullerene C<sub>60</sub> is systematically named ({{chem|C|60}}-''I''<sub>h</sub>)[5,6]fullerene. The name of the point group should be retained in any derivative of said fullerene, even if that symmetry is lost by the derivation.

To indicate the position of substituted or attached elements, the fullerene atoms are usually numbered in a spiral path, usually starting with the ring on one of the main axes. If the structure of the fullerene does not allow such numbering, another starting atom was chosen to still achieve a spiral path sequence.

The latter is the case for C<sub>70</sub>, which is ({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene in IUPAC notation. The symmetry ''D''<sub>5h(6)</sub> means that this is the isomer where the ''C''<sub>5</sub> axis goes through a pentagon surrounded by hexagons rather than pentagons.<ref name=iupacful/>
<gallery widths="200px" heights="200px">
Buckminsterfullerene-2D-skeletal numbered.svg|({{chem|C|60}}-''I''h)[5,6]fullerene<br/>Carbon numbering. 
C70fullerene-2D-skeletal numbered.svg|({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene<br/>Carbon numbering.
C70fullerene-2D-skeletal numbered isobonds.svg|({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene<br/>Non-equivalent bonds shown by different colours.
Cyclopropa12 C70fullerene-2D-skeletal renumbered.svg|3'''H''-Cyclopropa[1,2]({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene.
Cyclopropa212 C70fullerene-2D-skeletal renumbered.svg|3'''H''-Cyclopropa[2,12]({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene.
PC71BM.svg|{{chem|C|71}}-PCBM, [1,2]-isomer.<br/>IUPAC name is methyl 4-(3’-phenyl-3’H-cyclopropa[1,2]({{chem|C|70}}-''D''<sub>5h(6)</sub>)[5,6]fullerene-3’-yl)butyrate.
</gallery>
In IUPAC's nomenclature, fully saturated analogues of fullerenes are called ''fulleranes''. If the mesh has [[heteroatom|other element(s)]] substituted for one or more carbons, the compound is named a ''heterofullerene''. If a double bond is replaced by a [[methylene bridge]] {{chem2|\sCH2\s}}, the resulting structure is a ''homofullerene''. If an atom is fully deleted and missing valences saturated with hydrogen atoms, it is a ''norfullerene''. When bonds are removed (both sigma and pi), the compound becomes ''secofullerene''; if some new bonds are added in an unconventional order, it is a ''cyclofullerene''.<ref name="iupacful" />