title: Isolation and crystallographic identification of four isomers of Sm@C90.
abstract: Four isomers with the composition SmC(90) were obtained from carbon soot produced by electric arc vaporization of carbon rods doped with Sm(2)O(3). These were labeled Sm@C(90)(I), Sm@C(90)(II), Sm@C(90)(III), and Sm@C(90)(IV) in order of their elution times during chromatography on a Buckyprep column with toluene as the eluent. Analysis of the structures by single-crystal X-ray diffraction on cocrystals formed with Ni(octaethylporphyrin) reveals the identities of the individual isomers as follows: I, Sm@C(2)(40)-C(90); II, Sm@C(2)(42)-C(90); III, Sm@C(2v)(46)-C(90) and IV, Sm@C(2)(45)-C(90). This is the most extensive series of isomers of any endohedral fullerene to have their individual structures determined by single-crystal X-ray diffraction. The cage structures of these four isomers can be related pairwise to one another in a formal sense through sequential Stone-Wales transformations.
authors: College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China.
authors: Hua
authors: H
authors: Yang
authors: Hongxiao
authors: H
authors: Jin
authors: Hongyu
authors: H
authors: Zhen
authors: Zhimin
authors: Z
authors: Wang
authors: Ziyang
authors: Z
authors: Liu
authors: Christine M
authors: CM
authors: Beavers
authors: Brandon Q
authors: BQ
authors: Mercado
authors: Marilyn M
authors: MM
authors: Olmstead
authors: Alan L
authors: AL
authors: Balch