NATURAL ISOMERS OF FULLERENES FROM C30 TO C40

We have systematized possible ways of forming the isomers of midi-fullerenes, namely C-30, C-32, C-34 C-36, C-38 and C-40. Similar to the isomers of midi-fullerenes from C-20 to C-28, there are three the most natural mechanisms of their formation: 1) Embedding carbon dimers into initial fullerenes; 2) Fusion of carbon cupolas having the same symmetry; and 3) Fusion of fullerenes having compatible symmetry. The energies of the fullerenes calculated through the use of molecular mechanics are presented together with their graphs. It is found that in the majority of cases the minimum-energy fullerenes are those, having perfect and topological three-fold symmetries.