Anion radicals of mono- and bisfunctionalized [60]fullerene derivatives. Evidence for 13C satellites in their EPR spectra
✍ Scribed by V. Brezová; A. Staško; P. Rapta; D. M. Guldi; K.-D. Asmus; K.-P. Dinse
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 360 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Upon photo-and electrochemical in situ reduction of [ 60 ] fullerene derivatives, (n = 1, 2), C 60 [ C(COOEt) 2 ] n characteristic single-line EPR spectra are observed which are attributable to the corresponding radical anions. Monofunctionalized shows a reduction behavior similar to pristine i.e. formation of a C 60 [ C(COOEt) 2 ] C 60 , primary radical A which converts with time into B with a peak-to-peak width of mT and pp A Á 0.1 g A = 2.0000, mT and In contrast, the EPR spectra of the four bis-adducts-{equatorial, trans-1, trans-2 pp B Á 0.05 g B = 2.0006. and trans-3 are dominated by only one narrow line with pp ranging from 0.007 to 0.03 mT C 60 [ C(COOEt) 2 ] 2 } and g values between 2.0002 and 2.0004. Their relative width changes with the regiosteric positioning of the functionalizing addends. Well resolved spectra reveal 13C satellites, originating from 12-20 carbon nuclei. Slightly higher splittings mT) for four carbon nuclei suggest higher spin density at the keto group carbons of the (a 13 C Á 0.2 bis(ethoxycarbonyl)methylene substituents.