The first X-ray structural determinations of pristine fullerene C(60), cocrystallized 1:1 with corannulene and with its pentaalkyl-substituted derivative, 1,3,5,7,9-penta-tert-butyl-corannulene, have now been achieved.

Various tribenzotriquinacenes (TBTQs), most of which incorporate six functional groups at the periphery of their C3v-symmetrical, rigid and convex-concave molecular framework, have been studied with respect to their ability to form supramolecular complexes with the C60 and C70 fullerenes, either in the solid state or in solution. The hexabromo derivative Br6-TBTQ was cocrystallized with C60 as [Br6-TBTQ

A series of new cavity-containing molecular receptors, ''homothiaisocalixnaphthalenes'' containing 2,3-dialkoxy-substituted naphthalene units, have been synthesized, and some of their complexation properties have been investigated. The syntheses of the octaethoxy-and n-octapropoxy-octahomotetrathiaisocalix[4]naphthalenes were accompanied by small amounts of the corresponding higher dodecahomohexathia homologues. All of the macrocycles which were synthesized were highly symmetrical and conformationally flexible. Although these new macrocycles were not effective hosts for C 60 -and C 70 -fullerenes or the tetramethylammonium cation, two of them were shown, in a limited study, to effectively bind with Ag + and only modestly with Hg 2+ .

A series of new tetrahomodiazacalix[2]naphthalenes, containing 2,3-dialkoxy-substituted naphthalene units, have been synthesized and some of their properties are reported. All of the newly-synthesized macrocycles were highly symmetrical and conformationally rigid and revealed ''calixarene-like'' 1,3-alternate type structures.