he condensation of different building blocks allows the synthesis of an electrochemically active 5-nitro-11,17,23,29-tetramethylcalix[5]arene that was designed to study fullerene complexation using cyclic voltammetry. Although this method was ultimately unsuccessful, the formation of complexes between the calix[5]arene derivative and C-60 or C-70 fullerenes in solution was proved by mass spectrometry.
Moreover, the solid state structure of the complex with fullerene C-60 was confirmed by X-ray crystallography.