Electron paramagnetic resonance spectra of R–C60radicals Part 2: hindered rotation in alkyl- and silyl-C60radicals
- 1 January 1993
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 6,p. 1041-1045
- https://doi.org/10.1039/p29930001041
Abstract
Photolytically generated alkyl (R) and silyl (SiR3′) radicals react with C60 forming adducts readily identifiable by EPR spectroscopy. The temperature dependence of the spectra of R–C60 radicals indicates a barrier to rotation about the R–C60 bond (ΔH)which varies from ca. 3 kcal mol –1 for CH3–C60 to ca. 7 kcal mol–1 for tert-butyl-C60. Silyl-C60 radicals, on the other hand, are freely rotating about the Si–C60 bond although the Si–R′ bonds are non-rotating on the EPR timescale.Keywords
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