Intermolecular Interactions Between Fullerenes and Calixarenes. Leonard J. Barbour, G. William Orr, Jerry L. Atwood and Colin L. Raston, Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri, 65211

Crystallographic characterization of crystals containing C₆₀ is often confounded by twinning and orientational disorder. The latter is mainly due to the lack of anisotropy of the molecule, and to its inability to interact strongly with other species. Important considerations in the design of systems for molecular recognition include shape and size discrimination, as well as the exploitation of relatively weak non-covalent forces (e.g. hydrogen bonding, (( interactions, etc.) We have elucidated the crystal structures of several supramolecular complexes of C₆₀ and C₇₀ with calixarenes with a view to understanding interactions between fullerenes and other species in the solid state.