SOLID-STATE P-31 NMR CHARACTERIZATION OF BIFUNCTIONAL ION-EXCHANGE RESINS

NMR was used to provide evidence of site-site interactions in bifuncti onal polymers. A series of polymer-supported phosphonic acid and phosp honate ester ligands was examined by solid-state P-31 NMR spectroscopy , Interaction between phosphonate monoethyl ester sites was demonstrat ed and disruption of this interaction by the addition of diethyl ester groups was shown, The effect of the synthesis conditions on the bifun ctionality of resins containing both phosphonic acid and quaternary am ine groups was examined, The spectra indicated that the phosphonic aci d groups exists as phosphonate ions in the bifunctional amine/acid pol ymers and are capable of displacing chloride as the counterion on the amine sites.