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.

中文翻译：

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乙酰胺离子C22-的溶解度证据：K2C2⋅2NH3，Rb2C2⋅2NH3和Cs2C2⋅7NH3的合成和晶体结构

溶液中的碳阴离子：C ₂ ^2-哑铃在固态化合物中是众所周知的。现在，标题化合物的结晶表明，溶液中存在乙炔离子，因此可以实现具有少量溶解碳阴离子的化学反应。