Electronic absorption spectra of the C-60 complexes with some organic donors

Electronic absorption spectroscopy was used to study the electron processes in the complexes of fullerene with organic donors (9,9'-bis-trans-(telluraxanthenyl), tetranitride tetrasulfur, 2,2',6,6'-tetraphenyldipyranilydene, tetramethylenedithiodimethyl-tetrathiafulvalene and 2,2'-ethanediylidene bis(4,5-ethylenedithio-1,3-dithiole)). Changes in the electronic absorption spectrum of the fullerene have been investigated and discussed for C-60 complexes with organic donors of various molecular structure and electron-donor properties. The charge transfer between electron donor and C-60 has been observed only for the donor molecules having relatively low first oxidation potentials, thus capable of cation-radical formation. The spectral changes were correlated with the donor properties of the organic molecules forming the complexes with the fullerene.