Abstract
1H 19F 13C double cross polarization (DCP)/magic angle spinning (MAS) 13C n.m.r. and 13C 19F rotational echo double resonance (REDOR) CP/MAS 13C n.m.r. experiments performed on two low-molecular-weight monofluorinated organic compounds are reported. DCP n.m.r. permits the selective identification of resonances of carbons one- and two-bonds removed from a fluorine atom in these substances. Under our experimental conditions the 19F T 2 is on the order of 1 ms or less. This relaxation process is beneficial in the DCP experiment. It defeats proper echo formation in 13C 19F REDOR CP/MAS 13C n.m.r. experiments in which MAS speed and 19F( T 2) −1 are comparable. Potential remains for REDOR in coal structure analysis under experimental conditions that result in lengthened 19F T 2.
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