Synthesis of Endohedral ¹³³Xe-Fullerenol by Using Higher Fullerene

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Hydrophilic endohedral ¹³³Xe-fullerenols [¹³³Xe@C₇₆ (OH) _x and ¹³³Xe@C84 (OH) _x] were synthesized from hydrophobic endohedral ¹³³Xe-fullerenes. The yields were found to depend on the solubility of endohedral ¹³³Xe-fullerenols in ο-dichlorobenzene and water phases, reflecting the number of OH groups of the product. The endohedral ¹³³Xe-fullerenols stored in 0.9% NaCl solution at 20°C were stable enough for the use in nuclear medicine.