The most stable isomers of giant fullerenes C102 and C104 captured as chlorides, C102(603)Cl18/20 and C104(234)Cl16/18/20/22.

The chlorination of HPLC fractions with pristine giant fullerenes, C102 and C104, followed by X-ray crystallographic study of chlorides, C102(603)Cl18/20 and C104(234)Cl16-22, confirmed the presence of the most stable IPR (IPR = Isolated Pentagon Rule) isomers, C102(603) and C104(234), in the fullerene soot. The discussion concerns the chlorination patterns of polychlorides and relative stability of pristine isomers of C102 and C104 fullerenes.