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

Abstract Two types of fullerene–water colloidal systems: molecular-colloidal C 60 solution in water (C 60 FWS) and typical monodisperse C 60 hydrosol are compared in this work. It was confirmed that C 60 FWS consists of isolated C 60 molecules in hydrated state, C 60 @{H 2 O} n , and of their small spherical C 60 clusters of different sizes. It was shown that C 60 FWS simultaneously has the properties of both true solutions and colloidal systems. The origin of supramolecular complexes C 60 @{H 2 O} n stabilization is explained both by the weak donor–acceptor interactions of unpaired electrons of H 2 O 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.

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