Interactions of fullerenes and calixarenes in the solid state studied with 13 C-CP-MAS NMR.

We report our findings on the interactions of fullerenes with calixarenes, forming a solid-state complex between C[sub 60] and 4-tert-butylcalix[8]arene, and solid state NMR of this complex. Complexation of C[sub 60] with calix[8]arene can occur in CS[sub 2] and in benzene solution, leading to the formation of a solid-state complex. The experiments indicate a 1:1 stoichiometry for the complex. C[sub 70] does not form similar complexes with calix[8]arenes, leading to the possibility of transferring C[sub 60] to the solid phase, separating it from C[sub 70] remaining in solution. The solid-state complexation in benzene, leading to precipitation, provides strong evidence for establishment of an interaction between C[sub 60] and 1. A change of the conformation of the calixarene upon complexation is indicated by the OH shift in the IR and the solid-state CP-MAS NMR data. 17 refs., 2 figs.