Some features of analysis of solutions of fullerenes C60 and C70 by their absorption spectra

The absorption spectra of a series of solutions of C60 and C70 and of their mixture in o-xylene are studied. The deviation from the Bouguer-Lambert-Beer law was observed in the UV absorption band of the solutions. The possible reasons for this effect were analyzed. It is shown that to calculate reliably the composition and concentrations of fullerene mixtures, it is necessary to determine preliminarily the linearity region for the 335-nm absorption band.