TY - JOUR
T1 - Host-guest complexation of endohedral metallofullerene with azacrown ether and its application
AU - Tsuchiya, Takahiro
AU - Sato, Kumiko
AU - Kurihara, Hiroki
AU - Wakahara, Takatsugu
AU - Nakahodo, Tsukasa
AU - Maeda, Yutaka
AU - Akasaka, Takeshi
AU - Ohkubo, Kei
AU - Fukuzumi, Shunich
AU - Kato, Tatsuhisa
AU - Mizorogi, Naomi
AU - Kobayashi, Kaoru
AU - Nagase, Shigeru
PY - 2006/5/24
Y1 - 2006/5/24
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=33646733432&partnerID=8YFLogxK
U2 - 10.1021/ja0608390
DO - 10.1021/ja0608390
M3 - Article
AN - SCOPUS:33646733432
SN - 0002-7863
VL - 128
SP - 6699
EP - 6703
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 20
ER -