In this work, the UV-Vis absorption spectra of C60, tert-butylcalix [8] arene and their complex in benzene, toluene and carbon tetrachloride were studied. Their solubilities in these solvents were determined by the spectrophotometric evaluation. The concentration products of free C60 and tert-butylcalix [8] arene in the saturated solution of the complex were measured by a solution-precipitate equilibrium method. The true solubilities of the complex and the equilibrium constants of the inclusion reaction between C60 and tert-butylcalix [8] arene were estimated. The influence of solvent and the mechanism of precipitation were discussed.

Key words: ULTRAVIOLET SPECTROPHOTOMETRY, BENZENE, METHYLBENZENE, SOLUBILITY, CARBON TETRACHLORIDE, SOLVENT EFFECT, CALIXARENE, FULLERENES