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. Author manuscript; available in PMC: 2015 May 1.
Published in final edited form as: J Magn Reson. 2014 Feb 10;0:18–22. doi: 10.1016/j.jmr.2014.01.014

Figure 1.

Figure 1

Structure and 19F NMR spectra of PCE and PFPE. (A) Structure of PCE and (C) PFPE (R=CF2CF3 or CF3). (B) PCE has 20 equivalent 19F atoms showing a single peak at −92.8 ppm. (D) PFPE has about 28-36 19F atoms with two major chemical shifts at −90.7 and −90.9 ppm. The inset shows the magnified view of the major peaks. (E) 19F COSY shows that there is no spin-spin coupling between the peaks. (F) 19F COSY spectrum of PFPE at broad bandwidth shows a weak correlation between major and minor resonances supporting the assignment of minor peak to the endgroup of the molecule