Tetramethylammonium ozonide is an oxygen rich compound with the chemical formula [(CH3)4N]O3. It consists of tetramethylammonium cations ([(CH3)4N]+) and ozonide anions (O−3). The compound is a free radical with one unpaired electron. It can be created through the metathesis reaction with caesium ozonide (CsO3) in a liquid ammonia solution.
CsO3 + [(CH3)4N][O2] → CsO2 + [(CH3)4N][O3] Tetramethylammonium ozonide was found to be stable; it forms into transparent red crystals, and only decomposes above 75 °C.
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