Sara A. Maute, Alexander A. Marchione, Elizabeth L. Diaz
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Abstract
The popular multiplicity-edited heteronuclear single quantum coherence experiment has been modified for 19F-13C experiments by insertion of broadband inversion and refocusing pulses in 19F. This experiment has particular utility in distinguishing CF3 from CF2X, and CF2 from CFX (X = O or halide). Examples are shown of 1,1,2-trichloro-1,2,2-trifluoroethane, a mixture of 1,1,2-trichloro-1,2,2-trifluoroethane and two perfluoroolefins, and a mixture of poly(hexafluoropropylene oxide) and perfluorohexyl iodide. Phase distortions are minimized by careful selection of the value of JCF for which delays are optimized; a slight overstatement of JCF yielded no distortions, while an understatement did. Large 19F homonuclear couplings do not report cleanly in-phase. A one-dimensional version of the experiment yielded analogous editing by phase.
期刊介绍：
The Journal of Fluorine Chemistry contains reviews, original papers and short communications. The journal covers all aspects of pure and applied research on the chemistry as well as on the applications of fluorine, and of compounds or materials where fluorine exercises significant effects. This can include all chemistry research areas (inorganic, organic, organometallic, macromolecular and physical chemistry) but also includes papers on biological/biochemical related aspects of Fluorine chemistry as well as medicinal, agrochemical and pharmacological research. The Journal of Fluorine Chemistry also publishes environmental and industrial papers dealing with aspects of Fluorine chemistry on energy and material sciences. Preparative and physico-chemical investigations as well as theoretical, structural and mechanistic aspects are covered. The Journal, however, does not accept work of purely routine nature.
For reviews and special issues on particular topics of fluorine chemistry or from selected symposia, please contact the Regional Editors for further details.
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