Conuterion condensation is indirectly monitored via the effcetive charge of polyelectrolytes, which is determined in a combination of electrophoresis and diffusion NMR. The hydrodynamic friction is erived from the diffusion coefficient determined in PFG NMR, while electrophoresis NMR yields the electrophoretic mobility. Both are determined with chemical shift resoultion, which means tehy can be attributed to specific functional groups or structures. Thus organic counterions can be isnvestigated simultaneously.<br/>Poly(styrene sulfonate) has been titrated with hydroxides of different cations. to generated teh respective salts. While littel effect has been observed for monovalent counterions, there significantly stronger binding for bivalent counterions and strong differences with Ca showing strongest binding<br/>Higher valence of counterions has been established using small organic molecules. This in addition has the advantage, that the counterion is observed directly providing an additional cross check. Larger counterions establish the rtransition to the formation of polyelectrolyte complexes. In the present study primary complexes can be investigated selectively showing the electrostatic nature of the complex formation.

Counterion-specific counterion condensation

253rd National Meeting (2017)

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