title: Preparation and structural characterization of the Ih and the D5h isomers of the endohedral fullerenes Tm3N@C80: icosahedral C80 cage encapsulation of a trimetallic nitride magnetic cluster with three uncoupled Tm3+ ions.
abstract: We report an efficient method for the preparation and purification of the Ih and the D5h isomers of Tm3N@C80. Following preparation in a Kratschmer-Huffman electric-arc generator, the Tm3N@C80 isomers were obtained by a chemical separation process followed by a one-stage isomer selective chromatographic high-performance liquid chromatography (HPLC) separation (pyrenyl, 5PYE column). The HPLC chromatographic retention behavior on a pentabromobenzyl (5PBB) column suggests a charge transfer of approximately 6 electrons; [M3N] 6+@C80(6-) and the chromatographic retention mechanisms of the Ih and the D5h isomers of Tm3N@C80 on both 5PBB and 5PYE columns are discussed. Single-crystal X-ray diffraction data demonstrate that the Tm3N cluster has a planar structure but represents a tight fit for trapping the Tm3N cluster inside the I h - and the D 5h -C 80 cages. Specifically, the Tm atoms punch out the cage carbon atoms adjacent to them. The "punched out" effect can be demonstrated by cage radii and pyramidal angles at cage carbon atoms near the Tm atoms. The magnetic susceptibility (chiT) for Tm3N@ Ih -C80 was found to exhibit Curie-Weiss behavior with C = 23.4 emu.K/mol, which is consistent with the calculated value for three uncoupled Tm3+ ions by considering the spin and orbital contributions with no quenching of the orbital angular momentum ( L = 5, S = 1, and J = 6; Ccalcd = 23.3 emu.K/mol). The electrochemical measurements demonstrate that both the Ih and the D5h isomers of Tm3N@C80 have a large electrochemical gap.
authors.affiliation: Chemistry Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.
authors.forename: Tianming
authors.initials: T
authors.lastname: Zuo
authors.forename: Marilyn M
authors.initials: MM
authors.lastname: Olmstead
authors.forename: Christine M
authors.initials: CM
authors.lastname: Beavers
authors.forename: Alan L
authors.initials: AL
authors.lastname: Balch
authors.forename: Guangbin
authors.initials: G
authors.lastname: Wang
authors.forename: Gordon T
authors.initials: GT
authors.lastname: Yee
authors.forename: Chunying
authors.initials: C
authors.lastname: Shu
authors.forename: Liaosa
authors.initials: L
authors.lastname: Xu
authors.forename: Bevan
authors.initials: B
authors.lastname: Elliott
authors.forename: Luis
authors.initials: L
authors.lastname: Echegoyen
authors.forename: James C
authors.initials: JC
authors.lastname: Duchamp
authors.forename: Harry C
authors.initials: HC
authors.lastname: Dorn
mesh_terms: D002214:Capsules / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D037741:Fullerenes / Q000737:chemistry*; D007477:Ions; D007536:Isomerism; D008280:Magnetics; D009584:Nitrogen / Q000737:chemistry*; D013932:Thulium / Q000737:chemistry*
chemical_list: D002214:Capsules; D037741:Fullerenes; D007477:Ions; D013932:Thulium; D009584:Nitrogen