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Evidence of Solubility of the Acetylide Ion C22−: Syntheses and Crystal Structures of K2C2⋅2 NH3, Rb2C2⋅2 NH3, and Cs2C2⋅7 NH3



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Carbon anions in solution: C22− dumbbells are well-known in solid-state compounds. The crystallization of the title compounds now shows that acetylide ions are existent in solution and therefore chemistry with small dissolved carbon anions may be within reach.