The carbonite ion is an anion with the chemical formula CO2(2-). This divalent anion forms by deprotonation of carbonous acid (C(OH)2). Alkali metal salts of carbonous acid, Li2CO2 (lithium carbonite), K2CO2 (potassium carbonite), Rb2CO2 (rubidium carbonite) and Cs2CO2 (caesium carbonite), have been observed at 15 K.
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