The EPR spectra of FC60 and FC70

✍ Scribed by J.R. Morton; K.F. Preston; F. Negri

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 553 KB
• Volume: 221
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(94)87016-0

✦ Synopsis

The EPR spectra of F&c and four isomers of FC,c are described and discussed. As with H&n, the four isomers of FC,u that are observed are those with fluorine atoms attached to A-, B-, C-or D-type carbon atoms of the Cm molecule. The temperature dependence ( 1 /a) da/dT of the r9F hyperfme interaction in FC6c and the most abundant isomer of F&u is approximately twice that observed for the proton hyperfine interaction in HC& and HC,c, and the muon hypertke interaction in Mu&. The similarity of the temperature dependences in Co, and C,c derivatives indicates that the vibrations responsible for the temperature effect are of the same nature for the two radicals. The magnitude of the temperature-dependence coefficients of the fluoroderivatives is consistent with a smaller spin density in F( 2s) compared to that in the H ( 1s) orbital of H&u and HC,c.