Fluorine-19 resonances, expansion

The section on Spectroscopy has been retained but with some revisions and expansion. The section includes ultraviolet-visible spectroscopy, fluorescence, infrared and Raman spectroscopy, and X-ray spectrometry. Detection limits are listed for the elements when using flame emission, flame atomic absorption, electrothermal atomic absorption, argon induction coupled plasma, and flame atomic fluorescence. Nuclear magnetic resonance embraces tables for the nuclear properties of the elements, proton chemical shifts and coupling constants, and similar material for carbon-13, boron-11, nitrogen-15, fluorine-19, silicon-19, and phosphoms-31. 

Figure 5. Detailed expansion of the 188 MHz fluorine-19 resonances from the A5 (10101) and B5 (00101) sequences in (a) commercial PVF and (b) PVF prepared at -80"C in urea.

As an example of the complexity of the NMR spectra of polyfluorocompounds, Figure 2 shows expansions of the individual resonances of the olefinic fluorines from the spectrum of 6H-perfluorohex-l-ene (1)... 

Figure 2 Expansions of the individual resonances of the olefinic fluorines in the 564 MHz F NMR spectrum of 6H-perfluorohex-1-ene [I] in CDCI3 solution. On the left is shown the result of Fourier transformation of the raw data and on the right Is given the result of resolution enhancement. Assignments are FI (top), FI (center), and F2 (bottom).

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