Abstract
The association between paramagnetic Mn 2+ ions and dithionite ions S 2O 4 2− in aqueous solution assumes a particular significance because of the existence of an equilibrium displaced towards the formation of a complex. Proton spin relaxation times T 1 and T 2, associated with protons in solution in rapid exchange with protons of water molecules coordinated with the ion Mn 2+, are drastically shortened by the presence of the paramagnetic ions. On addition of dithionite ions, an increase in the relaxation times attributable to the presence of an inner-sphere complex is again observed. The observed increase is explained by the variation in the number of coordinated water molecules and the change in correlation times related to dipolar and exchange interactions. The proton spin relaxation data depend on the electron spin relaxation time T 2e1 and agree with the values deduced from our EPR studies of the above equilibrium. This investigation has been extended to the association of Mn 2+ ion with Cl − and So 4 2− ions.
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