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By Fourier transform NMR spectroscopy the  55 Mn and  95 Mo resonance lines in the different permanganate and molybdate species Mn 16 O 4-n  18 O n  -  and Mo 16 O 4-n  18 O n  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  55 Mn of (0.59 ± 0.02) ppm and for  95 Mo 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/T 1  of  55 Mn 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

Oxygen Isotope Effects in 55 Mn and 95 Mo NMR Spectra of the Permanganate and Molybdate Ion