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17O and 13C nuclear magnetic resonance study of polyfluorinated carbonyl compounds |
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| Affiliation: | 1. Applied Molecular Chemistry Course, Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano 386-8567, Japan;2. ALCARE Co. Ltd. Medical Engineering Laboratory, 1-21-10 Kyojima, Sumida-ku, Tokyo 131-0046, Japan |
| Abstract: | δ17O- and δ13C values are reported for 15 polyfluorinated carbonyl compounds. If the Rf group is separated from the carbonyl group by less than two carbon atoms a marked increase in the nuclear shielding of 13C(C=O) and a marked decrease in the nuclear shielding of the 17O(C=O) nucleus is observed. This is ascribed to the differing effects of the Rf group on the σ and the π system of the carbonyl unit. The effect on the σ-manifold leads to increase in shielding but it may be offset (as in the case of the 17O nucleus) by destabilization of the π system. UV spectroscopic data for some polyfluorinated carbonyl compounds support these arguments. |
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