Characterization of Ce@C82 and its anion.
Ce@C(82) is isolated by high-performance liquid chromatography (HPLC) and the cage symmetry is determined as C(2)(v)() by measuring the (13)C NMR spectra of its anion. The (13)C NMR peaks of [Ce@C(82)](-) show temperature-dependent shifts ascribed to the f electron remaining on the Ce atom. Both Ce@C(82) and [Ce@C(82)](-) are silent in electron spin resonance spectroscopy (ESR) because of the highly anisotropic g matrix as well as of the fast relaxation process originating from the orbital angular momentum of the f electron. This is the complementary relationship to the observation of the paramagnetic shift in (13)C NMR. [Ce@C(82)](-) has lower stability in air than [La@C(82)](-).
Wakahara
Takatsugu
T
Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
Kobayashi
Jun-ichi
J
Yamada
Michio
M
Maeda
Yutaka
Y
Tsuchiya
Takahiro
T
Okamura
Mutsuo
M
Akasaka
Takeshi
T
Waelchli
Markus
M
Kobayashi
Kaoru
K
Nagase
Shigeru
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Kato
Tatsuhisa
T
Kako
Masahiro
M
Yamamoto
Kazunori
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Kadish
Karl M
KM