Fluorine-19 NMR of solids with both homonuclear (multipulse) decoupling and pulsed proton decoupling

The application of multipulse and of combined rotation and multipulse spectroscopy (CRAMPS) to fluorine is demonstrated. The MREV-8 multipulse sequence is applied to average the homonuclear dipolar coupling between the fluorine nuclei. The heteronuclear dipolar coupling to the protons can be suppressed by irradiation with a synchronized sequence of pi pulses at the proton frequency. MAS is applied to average the anisotropy of the chemical shift. Applications to a fluorinated adamantane derivative and to polyvinylidenedifluoride (PVDF) are shown.