Syntheses of Dioxygenyl Salts by Photochemical Reactions in Liquid Anhydrous Hydrogen Fluoride: X-ray Crystal Structures of α- and β-O<sub>2</sub>Sn<sub>2</sub>F<sub>9</sub>, O<sub>2</sub>Sn<sub>2</sub>F<sub>9</sub>·0.9HF, O<sub>2</sub>GeF<sub>5</sub>·HF, and O<sub>2</sub>[Hg(HF)]<sub>4</sub>(SbF<sub>6</sub>)<sub>9</sub>
Inorganic chemistry