Complexation of C60 with hexahomooxacalix[3]arenes and supramolecular structures of complexes in the solid state

Abstract

Hexahomooxacalix[3]arenes 1–5, which possess a variety of substituents on their upper rim, have captured fullerene C₆₀ in toluene with association constants of K_a = 9.1–35.6 dm³ mol^–1; X-ray analysis of the complex of C₆₀ and 4 indicated that a van der Waals attractive interaction is the dominant driving force which brings the hexagonal faces of the C₆₀ close to both the aromatic rings and the dibenzyl ether oxygen of 4.