A superhalogen F@C20(CN)20 and a corresponding Br{\o}nsted
superacid were designed and investigated on DFT and DLPNO-CCSD(T) levels of
theory. Calculated compounds have outstanding electron affinity and
deprotonation energy, respectively. We consider superacid
H[F@C20(CN)20] to be able to protonate molecular nitrogen. The
stability of these structures is discussed, while some of the previous
predictions concerning Br{\o}nsted superacids of record strength are doubted.Comment: 11 pages (main paper), 32 pages (supporting information), 10 figures,
10 tables, 62 reference