Double-Concave Binding of Bicorannulenyl Dianion: Cesium vs Lithium Salts

The
first X-ray structural characterization of bicorannulenyl dianion
has been accomplished for two alkali metal salts, [Li+(THF)4]2[C40H182–] (1) and [Cs+(18-crown-6)]2[C40H182–] (2). This
crystallographic study revealed the biaryl stereochemistry, geometry
transformation upon acquiring two electrons, and different binding
preferences of Li+ vs Cs+ ions in the solid-state
products.

本研究首次完成了双碗烯二阴离子（bicorannulenyl dianion）两种碱金属盐的X射线结构表征，这两种盐分别为[Li⁺(四氢呋喃(THF))₄]₂[C₄₀H₁₈²⁻]（1）与[Cs⁺(18-冠-6)]₂[C₄₀H₁₈²⁻]（2）。本次晶体学研究揭示了该联芳基化合物的立体化学特征、获得两个电子后的几何构型转变，以及固态产物中Li⁺与Cs⁺离子迥异的结合偏好。