Comparative analysis of two aqueous-colloidal solutions of C60 fullerene with help of FTIR reflectance and UV-Vis spectroscopy

Two types of fullerene-water colloidal systems: molecular-colloidal C-60 solution in water (C60FWS) and typical monodisperse C-60 hydrosol are compared in this work. It was confirmed that C60FWS consists of isolated C-60 molecules in hydrated state, C-60@{H2O}(n), and of their small spherical C-60 clusters of different sizes. It was shown that C60FWS simultaneously has the properties of both true solutions and colloidal systems. The origin of supramolecular complexes C-60@{H2O}n, stabilization is explained both by the weak donor-acceptor interactions of unpaired electrons of H2O oxygen atoms with fullerene molecule and by formation of ordered, H-bounded and sphere-like hydrated shells around the fullerene. Spectra of surface enhanced infrared absorption (SEIRA) Of C-60 on gold substrate were recorded in FTIR reflectance mode. In the 400-900 cm(-1) region some additional vibration bands Of C-60, which are forbidden in IR spectra, have been registered. Earlier the similar bands had been observed in inelastic neutron scattering. (C) 2002 Elsevier Science B.V. All rights reserved.