H-1 NMR relaxation studies on glycerine-water and dioxan-water with paramagnetic ions

The Proton magnetic Resonance (PMR) spin-lattice and spin-spin relaxation t imes (T-1 and T-2) were measured in highly viscous (glycerine-water) and le ss viscous (dioxan - water) systems at different temperatures. The values o f relaxation times increase with increasing the temperature. This result is interpreted as due to the combined effect of viscosity and temperature in these solutions. The relaxation rimes were also measured in these solutions containing paramagnetic ions (PMI). The results indicate that the possibil ity of an anti-parallel bonding of the paramagnetic ions is higher in highl y viscous solutions as compared to low viscous systems and the association in the above mixtures appears to be weak.