On the Radical Anion Spectra of Fullerenes C60 and C70

Abstract

The radical anion spectra of C60 and C70 can be easily generated and studied in primary aliphatic amines. In these conditions the C60 _• and C70 _• species are accompanied by the dianions C60 2− and C70 2−. In the near infrared region the electronic transitions at 1075, 1058 and 991 nm were assigned to C60 _• while those at 1020–1030 nm and at 933 nm were assigned to the fullerene dianion C60 2−. The electronic transition of C70 _• occurs at 1370 nm and that of C60 2− at 1170 nm, but in primary aliphatic amines C70 also display a broad absorption band at 814–820 nm with other features certainly due to a specific interaction of the amine with C70. The behavior of C60 was studied with primary aromatic amines, but no interaction was found. Furthermore, solutions of C60 and C70 were studied with the secondary amine dioctylamine and with the tertiary amines triethylamine and N,N,N',N'-tetramethylethylenediamine (TMEDA). FT-IR spectra of selected fullerene-amine adducts were reported.