Science. 1994 Aug 19;265(5175):1065-7. doi: 10.1126/science.265.5175.1065.
Stable ten-component sandwich compounds have been characterized in which four lithium ions reside between two tetraanions derived from corannulene or its alkyl-substituted derivatives and four additional lithium ions decorate the exterior. In tetrahydrofuran solution, the four lithium ions inside the sandwich can exchange environments with the four external lithium atoms, but the two tetraanion decks of the sandwich never separate from one another on the time scale of nuclear magnetic resonance. Theoretical calculations point to a "stacked bowl" conformation and a low energy barrier for synchronous double inversion of the tetraanion bowls in the solvated sandwich compounds.
已对稳定的十组件夹心化合物进行了表征，其中四个锂离子位于两个源自篮烯或其烷基取代衍生物的四阴离子之间，另外四个锂离子则位于外部。在四氢呋喃溶液中，夹心内的四个锂离子可以与四个外部锂离子交换环境，但夹心的两个四阴离子甲板在核磁共振的时间尺度上从不彼此分离。理论计算表明，在溶剂化夹心化合物中，四阴离子碗的同步双重反转具有“堆叠碗”构象和低能量势垒。
