Host-guest complexation of endohedral metallofullerene with azacrown ether and its application

Takahiro Tsuchiya, Kumiko Sato, Hiroki Kurihara, Takatsugu Wakahara, Tsukasa Nakahodo, Yutaka Maeda, Takeshi Akasaka, Kei Ohkubo, Shunich Fukuzumi, Tatsuhisa Kato, Naomi Mizorogi, Kaoru Kobayashi, Shigeru Nagase

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46 Scopus citations


Complexation of endohedral metallofullerene La@C82-A (1) with macrocyclic compounds, such as 1,4,7,10,13,16-hexaazacyclooctadecane (2), 1,4,7,10,13,16-hexamethyl-1,4,7,10,13,16-hexaazacyclooctadecane (3), mono-aza-18-crown-6 ether (4), 18-crown-6 ether (5), and p-tert-butylcalix[n] arenes (n = 4-8, 6-10), for the first time is examined. Among them, 1 forms a complex with azacrown ethers 2-4 while accompanying the electron transfer between them. This is characteristic of endohedral metallofullerene and caused by its low reduction potential. Activation energies, ΔGet, for the electron transfer from 2-4 to 1 are 4.6, 2.8, and 11 kcal/mol, respectively. These small ΔGet values indicate that the electron transfer from the azacrown ethers to 1 is facile in the ground state. Furthermore, the selective isolation of lanthanum endohedral metallofullerenes from the extracts of soot is accomplished by utilizing the complexation of 1 with 2.

Original languageEnglish
Pages (from-to)6699-6703
Number of pages5
JournalJournal of the American Chemical Society
Issue number20
StatePublished - 24 May 2006


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