ELECTRONIC ABSORPTION-SPECTRA OF THE C-60 COMPLEXES WITH SOME ORGANICDONORS

Electronic absorption spectroscopy was used to study the electron proc esses in the complexes of fullerene with organic donors (9,9'-bis-tran s-(telluraxanthenyl), tetranitride tetrasulfur, 2,2',6,6'-tetraphenyld ipyranilydene, tetramethylenedithiodimethyl-tetrathiafulvalene and 2,2 '-ethanediylidene bis(4,5-ethylenedithio-1,3-dithiole)). Changes in th e electronic absorption spectrum of the fullerene have been investigat ed and discussed for C-60 complexes with organic donors of various mol ecular structure and electron-donor properties. The charge transfer be tween electron donor and C-60 has been observed only for the donor mol ecules 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 w ith the fullerene.