Abstract
A series of 1:1 C 60 cycloaddition adducts, C 60A (A = anthracene, butadiene, cyclopentadiene and methylcyclopentadiene), has been synthesized. The products are cleanly separated and characterized by use of TGA, 1H-NMR, IR, and mass spectrometry. Among these adducts, C 60, (methylcyclopentadiene) showed the highest thermal stability and was doped with three equivalents of rubidium. The resulting Rb 3C 60 (MeCp) is a semiconductor but can be thermally converted to the superconducting Rb 3C 60 through a retro-Diels-Alder reaction. A one-step doping process to prepare Rb 3C 60 crystals has been developed. The optimal doping condition occurs at 3̃00°C. High superconducting shielding fractions between 60 and 90% and sharp transition widths (Δ T 10- 90between 4 and 0.7 K) were measured for these samples.
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