Donor-acceptor complexes of fullerene C-60 with organic and organometallicdonors

The paper presents data on the synthesis, IR, electronic, X-ray photoelectr on, and ESR spectroscopies of fullerene C-60 molecular complexes with vario us types of donor compounds, namely, substituted tetrathiafulvalenes, aroma tic hydrocarbons, diazodithiafulvalene, tetra-phenyldipyranylidene, tetrasu lfur tetranitride, saturated amines, some metallocenes, and Co(II) and Mn(I I) tetraphenylporphyrins. Crystal structures of some of these complexes are discussed. The degree of charge transfer in the complexes is evaluated fro m the shift of the F-1u(4) C-60 mode in the IR spectra. The factors respons ible for the appearance of the symmetry-forbidden C-60 vibrations and the s plitting of the absorption bands of C-60 in the complexes are considered. T he electronic absorption spectra of some complexes show the decrease of the intensity of electron transitions of C-60 at 420-530 nm and the appearance of new absorption bands attributed to charge transfer from the donor to C- 60. The dependences of the energy of charge transfer in the C-60 complexes on ionisation and redox potentials of substituted tetra-thiafulvalenes are derived. Peculiarities of donor-acceptor interaction of donor molecules wit h the spherical C-60 are considered.