Noun
English Wikipedia has an article on:metallofullereneWikipedia
metallofullerene (plural metallofullerenes)
(chemistry) A fullerene containing an enclosed metal atom
However, they found that the asymmetrical molecule could theoretically collapse to form nearly every known fullerene and metallofullerene. Source: Internet
The synthesized substance was a particular metallofullerene consisting of 84 carbon atoms with two additional carbon atoms and two yttrium atoms inside the cage. Source: Internet