✍ Scribed by Y. Shin; C. Wang; G. J. Exarhos
No coin nor oath required. For personal study only.
opens a new and convenient way to apply metallofullerenes in nanotechnologies.
Sc@C 82 was synthesized by the Krätschmer±Huffman method, and isolated by multiple-step high-performance liquid chromatography (Japan Analytical Industry Co., Ltd) using Buckyprep and Buckyclutcher columns. The purified Sc@C 82 was dissolved in toluene solution first, and then poured into acetonitrile solvent rapidly until the volume fraction v ace of acetonitrile reached ca. 85 %. A Sc@C 82 cluster suspension was generated in the solvent mixture and was checked by AFM.
Sc@C 82 nanowire and tube arrays were prepared in a Sc@C 82 cluster suspension by the technique of electrophoretic deposition similar to that used for preparation of C 60 nanowires and also C 60 thin films [15] . The toluene/acetonitrile electrolyte solution containing 40 lM Sc@C 82 was transferred to a small Teflon (polytetrafluoroethylene) cell, in which the evaporated Ag substrate of a porous AAO template, serving as the anode, and a platinum counter electrode were set at a distance of 5 mm using a Teflon spacer. AAO templates [21] (Anodise, Whatman Inc. Co.) with nominal pore diameter of 200 nm were chosen and the DC voltage for Sc@C 82 deposition was set at 100 V. The morphology of Sc@C 82 nanostructures can be controlled by adjusting the deposition time. After the deposition, the AAO templates with Sc@C 82 nanostructures were thoroughly washed with acetonitrile solvent.
The removal of Sc@C 82 nanowires or nanotubes from the AAO support was carried out by dissolving the AAO template in 2 M NaOH at 25 C for 2 h. For TEM and SEM observation, the nanostructures were detached from the Ag substrate and ultrasonically dispersed. A Philips CM200 FEG transmission electron microscope operated at 160 kV and a JEOL JSM-6700F field-emission scanning electron microscope were employed in the study of the morphology and structure of the Sc@C 82 nanowires and nanotubes.
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Elemental sulfur can be reduced to the corresponding thiolate anion species (S מ2 and ) se- ## מ2 S 2 lectively by samarium diiodide in the presence and absence of HMPA, respectively. The subsequent alkylation of the thiolate anion species provides a useful synthetic route to dialkyl sulfides