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到1973年,碱金属阴离子能在溶液中存在的证据已十分确凿,热力学估算肯定了M~+CryM~-型离子晶体盐的稳定性。从有隐醚C222的钠或钾的甲胺或乙胺浓溶液中将溶剂迅速蒸发,在玻璃器壁中会有貌似金属的金色薄膜出现。将Na~+C222Na在乙胺中的溶液(≈0.1mol·L~(-1)从278K冷却到干冰温度,会有金色的粉末从溶液中沉淀出来。缓慢地冷却会生长成六方晶体的Na~+C222Na~-盐。分析结果和晶体结构测定确认了这是第一个含有碱金属阴离子的固态化合物。这类化合物的其它成员的分离和鉴定遇到了困难,由于它们的稳定性差,合适的结晶溶剂难找,近来我们在这方面有显著的进展。
By 1973, the evidence that alkali metal anions were present in solution was well established, and the thermodynamic estimates affirmed the stability of the salt of M ~ + CryM ~ -type crystals. The solvent is rapidly evaporated from the sodium or potassium methylamine or ethylamine concentrate solution of heroin C222 and a seemingly metallic gold film appears in the glass wall. A solution of Na ~ + C222Na in ethylamine (≈0.1 mol·L ~ (-1)) is cooled from 278 K to dry ice temperature, and gold powder will precipitate out of the solution. Slow cooling will result in the formation of hexagonal Na ~ + C222Na ~ - salt. The results of the analysis and crystal structure determination confirm that this is the first solid compound containing an alkali metal anion. Isolation and characterization of other members of this class have encountered difficulties due to their poor stability Crystallization solvents are hard to find, and recently we have made significant progress in this area.