³⁵Cl N.M.R. relaxation in aqueous sodium perchlorate solutions

Abstract

The relaxation time, Tip, for ~5C1 in perchlorate ion in aqueous solutions is found to be 0.25 s. Tip is insensitive to the presence of most first row transition metals; however, a weak complex with manganous ion is demonstrated, and the perchlorate ion-manganous exchange rate is shown to be between 3 • 10 ~ s -1 and 3-6 x 107 s -1. In the absence of manganous ion, the relaxation is dominated by the nuclear electric quadrupole interaction; however, a dipolar contribution is observed with manganous ion present.