Magnetic resonance distinction between site bound and atmospherically bound paramagnetic counterions in polyelectrolyte solutions.
A combination of the water protons NMR chemical shifts, longitudinal and transversal relaxation rates and of the paramagnetic counterion EPR signal is shown to provide a clear distinction between site binding, atmospheric trapping and free counterions in solutions of polyelectrolyte TMA salts with increasing concentrations of the divalent counterions Co++ and Mn++. Site binding is defined by the loss of water in the counterion first hydration shell while atmospheric binding results in a change in the counterion correlation time as compared to a free ion.
D001665:Binding Sites; D003035:Cobalt; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008345:Manganese; D008433:Mathematics; D008954:Models, Biological; D008968:Molecular Conformation; D010710:Phosphates; D011108:Polymers; D014867:Water
D010710:Phosphates; D011108:Polymers; D014867:Water; D003035:Cobalt; D008345:Manganese