Oxygen-17 NMR Shifts Caused by Cr++ in Aqueous Solutions

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Abstract
Cr++ in solution produces a paramagnetic shift in the NMR absorption of O17 in ClO4—, as well as the expected paramagnetic shift for O17 in H2O. As the concentration of ClO4— increases, the shift in the H2O17 absorption is diminished, and eventually changes sign. The effects are ascribed to preferential replacement by ClO4— of water molecules from the axial positions in the first coordination sphere about Cr++.