Calix[6]arenes bearing adamantyl groups at the exo-rim form pseudorotaxanes with dialkylammonium axles paired to the weakly coordinating [B(Ar^F)₄]⁻ anion. The exo-adamantyl groups give rise to a more efficient threading with respect to the exo-tert-butyl ones, leading to apparent association constants more than one order of magnitude higher. This improved stability has been ascribed to the more favorable van der Waals interactions of exo-adamantyls versus exo-tert-butyls with the cationic axle. Calix[6]arenes bearing endo-OH functions give rise to a less efficient threading with respect to the endo-OR ones, in line with what was known from the complexation of alkali metal cations.

中文翻译：

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外金刚烷基和内-OH功能对杯[6]芳烃大环的线程。

杯[6]芳烃轴承金刚烷基在外型与二烷基车轴-rim形式pseudorotaxanes配对至弱配位[B（AR ^˚F）₄ ] ^-的阴离子。所述外切金刚烷基团产生更有效的螺纹相对于所述外-叔丁基的，导致明显的结合常数超过一个数量级高。这种改进的稳定性已被归因于更有利范德瓦的耳斯相互作用外型-adamantyls与外切-叔与阳离子轮轴-butyls。杯[6]芳烃轴承内相对于内-OR基团，-OH官能团导致效率较低的穿线，这与从碱金属阳离子的络合中已知的一致。