The encapsulation of fullerenes with a cyclotriveratrylene derivative, capable to self assemble into a dimer by means of three strong 4-ureidopyrimidinone quadruple hydrogen bonds is described. The system shows preference for C84, allowing its easy enrichment directly from fullerene mixtures.
![Preferential separation of fullerene[84] from fullerene mixtures by encapsulation](https://www.iciq.org/wp-content/uploads/2014/03/Preferential-separation_eng_noticies_articles_2007_101.gif)