title: Characterization of Ce@C82 and its anion.
abstract: 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)](-).
authors.affiliation: Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Takatsugu
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authors.lastname: Wakahara
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authors.lastname: Kobayashi
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authors.lastname: Yamada
authors.forename: Yutaka
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authors.lastname: Maeda
authors.forename: Takahiro
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authors.lastname: Tsuchiya
authors.forename: Mutsuo
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authors.lastname: Okamura
authors.forename: Takeshi
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authors.lastname: Akasaka
authors.forename: Markus
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authors.lastname: Waelchli
authors.forename: Kaoru
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authors.lastname: Kobayashi
authors.forename: Shigeru
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authors.lastname: Nagase
authors.forename: Tatsuhisa
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authors.lastname: Kato
authors.forename: Masahiro
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authors.lastname: Kako
authors.forename: Kazunori
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authors.lastname: Yamamoto
authors.forename: Karl M
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authors.lastname: Kadish