title: Isolation of three isomers of Sm@C84 and X-ray crystallographic characterization of Sm@D(3d)(19)-C84 and Sm@C2(13)-C84.
abstract: Three isomers with the composition Sm@C(84) were isolated from carbon soot obtained by electric arc vaporization of carbon rods doped with Sm(2)O(3). These isomers were labeled Sm@C(84)(I), Sm@C(84)(II), and Sm@C(84)(III) 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(II)(octaethylporphyrin) reveals the identities of two of the isomers: Sm@C(84)(I) is Sm@C(2)(13)-C(84), and Sm@C(84)(III) is Sm@ D(3d)(19)-C(84). Sm@C(84)(II) can be identified as Sm@C(2)(11)-C(84) on the basis of the similarity of its UV/vis/NIR spectrum with that of Yb@C(2)(11)-C(84), whose carbon cage has been characterized by (13)C NMR spectroscopy. Comparison of the three Sm@C(84) isomers identified in this project with two prior reports of the preparation and isolation of isomers of Sm@C(84) indicate that five different Sm@C(84) isomers have been found and that the source of samarium used for the generation of fullerene soot is important in determining which of these isomers form.
authors.affiliation: College of Life Science, Zhejiang Sci-Tech University, Hangzhou 310018, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yang
authors.forename: Meilan
authors.initials: M
authors.lastname: Yu
authors.forename: Hongxiao
authors.initials: H
authors.lastname: Jin
authors.forename: Ziyang
authors.initials: Z
authors.lastname: Liu
authors.forename: Mingguang
authors.initials: M
authors.lastname: Yao
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.forename: Marilyn M
authors.initials: MM
authors.lastname: Olmstead
authors.forename: Alan L
authors.initials: AL
authors.lastname: Balch
mesh_terms: D018360:Crystallography, X-Ray; D037741:Fullerenes / Q000737:chemistry / Q000302:isolation & purification*; D008958:Models, Molecular; D012493:Samarium / Q000737:chemistry / Q000302:isolation & purification*; D013237:Stereoisomerism
chemical_list: D037741:Fullerenes; D012493:Samarium