2D experiments for the characterization of fluorinated polymers: pulsed-field gradients 1H–19F hetero-COSY and its selective version

In this paper, we demonstrate the utility of 1H–19F chemical shift correlation 2D NMR experiments for the characterization of fluorinated compounds. 1H–19F hetero-COSY provides much more information compared to the used 1H–19F HMQC and HMBC experiments. We performed 1H–19F hetero-COSY experiment and its selective version, both with pulsed field gradients, to obtain resonance assignments for the characterization of fluoromolecules. These experiments are illustrated by spectra of C2F5(VDF)2I, used here as a model compound, and spectra of the fluorinated terpolymer XC2000S containing vinylidenefluoride (VDF), tetrafluoroethylene (TFE) and allyloxypropandiol (AOPD).