| Abstract: | 60]- and 70]Fullerenes have been shown to form 1:1 supramolecular complexes with bis2-(5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41-pentahydroxycalix6]arenyl-oxy ethyl ether) (1) and 5,11,17,23,29,35-hexa-tert-butyl-37,38,40,41-tetra hydroxyl-39,42-(crown-4)calix6]arene (2) in CHCl3 medium by electronic absorption spectroscopy. Formation constants (K) of the complexes of 60]- and 70]fullerenes with 1 and 2 have been determined at room temperature from which free energy of formation values of the complexes have been estimated. The very high formation constant value of 60]fullerene/1 complex (5900 dm3 mol-1) in indicative of formation of inclusion complex. Moreover, PM3 calculations reveal that intermolecular interaction between 60]fullerene and 1 proceeds through quite deep energy molecular orbital. |
