NOVEL ASPECTS IN THE PHOTOCHEMICAL REDOX REACTIONS OF C-60 USING TRIETHYLAMINE DONOR

In the photochemical reduction of C-60 with triethylamine donor monito red by near-IR spectroscopy, the primary mono-anion formed, C-60(-.), converts to C60H- species, which, after stopping the irradiation. reco vers back to C-60(-.). The C60H- formation probably proceeds via a fur ther photoexcitation of C-60(-.), its intermediate di-anion formation coupled with a rapid protonization by the intermediately formed trieth ylamine cation. EPR experiments closely analogous to the near-LR inves tigations also confirmed the primary formation of C-60(-.), its disapp earance during prolonged irradiation as well as its reappearance after stopping irradiation. EPR spectra additionally reveal a further inter mediate related to C-60 mono- and di-anion, probably C-60 mono-anion a ssociate. (C) 1998 Elsevier Science S.A. All rights reserved.