Remarkably stable C60 and C70 complexes with stability constants Ks of 70 680±2060 and 136 620±3770 M−1, respectively, are formed by azacalix[4]arene[4]pyridine 1. The smaller-ring-homologue azacalix[2]arene[2]pyridine and compound 1 were readily synthesized, and they adopt a heavily twisted 1,3-alternate and a 1,2,3-partial cone conformation, respectively, in the solid state (see picture).
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Wang et al. (2004) studied this question.