CLUSTERIZATION OF FULLERENE <font>C</font>₇₀ MOLECULES IN SOLUTIONS AND ITS INFLUENCE TO OPTICAL AND NONLINEAR OPTICAL PROPERTIES OF SOLUTIONS

Nonlinear optical rotation of elliptically polarized laser pulses (λ = 532 nm, τ FWHM ~ 12 ns) in benzene, toluene and binary (toluene+acetonitrile) solutions of fullerene C 70 –D 5h(6) has been investigated experimentally. High-resolution transmission electron microscope studies of C 70 -solutions showed stable ball-shaped C 70 -clusters formation in toluene+acetonitrile mixtures. It has been demonstrated, that the C 70 -clusters sizes depend on initial concentration of C 70 , as well as volume fraction of acetonitrile in solvent mixture. The most probable model of C 70 -clusterization in solutions was proposed. Correlations between the processes of nonlinear rotation of polarization ellipse, change of electronic absorption spectra and C 70 -clusters formation in solutions have been demonstrated. Physical mechanisms of laser-induced optical activity in C 70 -solutions have been discussed. The values of the nonlinear Kerr coefficient (n 2 ) and nonlinear susceptibility component [Formula: see text] of C 70 -solutions in: toluene, benzene with various polarization ellipticity (θ = 0.2-0.8), and toluene+acetonitrile at different concentrations of C 70 for various volume fractions of acetonitrile have been determined.

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