Photophysical properties of the extract of endometallofullerenes La(@)C-2nin ortho-dichlorobenzene. Picosecond laser photolysis

The kinetics of relaxation of optical anisotropy induced by polarized light in endometallofullerenes La@C-2n in ortho-dichlorobenzene was studied by p icosecond laser photolysis. Decay of the optical absorption signal due to t he excited states of La@C-2n follows the biexponential law with two values of relaxation time: t(1) = 35+/-3 ps and t(2) = 1100+/-200 ps. The lifetime t or decay of the optical anisotropy is 19+/-5 ps and determined by the or ientational diffusion of La@C-2n. The experimentally determined lifetime of optical anisotropy agrees satisfactorily with the value yielded by the the oretical model of orientational diffusion under slip boundary conditions at the interface of the La@C-2n molecule with the solvent.