title: Lanthanum endohedral metallofulleropyrrolidines: synthesis, isolation, and EPR characterization.
abstract: Lanthanum endohedral metallofulleropyrrolidines have been synthesized for the first time through addition of an azomethine ylide to La@C(82)-A in toluene. It was found that the addition reaction is very efficient and, to some extent, regioselective. Two major endohedral metallofulleropyrrolidines, a monoadduct and a bisadduct of La@C(82)-A with abundance ratio of approximately 1:0.4, have been isolated by HPLC chromatography and characterized by mass spectrometry, UV/Vis-NIR absorption, and EPR spectroscopy. The electronic structure of La@C(82)-A has been modified slightly upon monoaddition and significantly upon bisaddition of the pyrrolidines.
authors.affiliation: Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
authors.forename: Baopeng
authors.initials: B
authors.lastname: Cao
authors.forename: Takatsugu
authors.initials: T
authors.lastname: Wakahara
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Maeda
authors.forename: Aihong
authors.initials: A
authors.lastname: Han
authors.forename: Takeshi
authors.initials: T
authors.lastname: Akasaka
authors.forename: Tatsuhisa
authors.initials: T
authors.lastname: Kato
authors.forename: Kaoru
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Shigeru
authors.initials: S
authors.lastname: Nagase