Volume properties of water solutions and refraction at 25$^\circ$C water-soluble tris-malonate of light fullerene – C$_{60}$ [= C(COOH)$_{2}$]$_{3}$

The volume properties of water soluble tris-malonate of light fullerene – C$_{60}$ [= C(COOH)$_{2}$]$_{3}$ were investigated with the help of quartz pycnometers at 25$^\circ$C, including the concentration dependence of density, average molar volume of the solutions and partial molar volumes of C$_{60}$ [= C(COOH)$_{2}$]$_{3}$ and H$_{2}$O. Concentration dependence of the refraction index in water solutions of C$_{60}$ [= C(COOH)$_{2}$]$_{3}$ was also determined with the help of refractometer, specific and molar refraction of the components were calculated with the help of the rules of the additive refraction of solution components.