The dipole moments and Kerr electrooptical constants of C₆₀ derivatives (methanofullerene and fulleropyrrolidine monoadducts with different addend structures) were determined in solutions. A comparison of the experimental C₆₀ monoadduct characteristics and the calculated values obtained by the quantum-chemical density functional theory and semiempirical PM-3 methods showed fullerene to have a coordinating action on the structural units of the addends containing unsaturated bonds.