Abstract
By Fourier transform NMR spectroscopy the 55Mn and 95Mo resonance lines in the different permanganate and molybdate species Mn16O4-n 18On - and Mo16O4-n 18On 2- {n = 0, 1, 2, 3, 4) have been resolved in aqueous solutions of potassium permanganate and sodium molybdate. An isotopic effect on the Larmor frequency for 55Mn of (0.59 ± 0.02) ppm and for 95Mo of (0.25 ±0.01) ppm to lower frequency has been found for the substitution of one 160 atom by one 180 atom. The relaxation rates 1/T1 of 55Mn in the different lines of the permanganate solution are equal within the limits of error. The oxygen exchange rate for the water-permanganate system has been evaluated
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