A downfield shift of 25 ppm or more for each deuteration of the hydrogen bonds of cobaloximes (see schematic illustration; L=pyridine, PPh3; R=Me, iPr) indicates an expansion of the coordination environment and is an impressive example of the powerful magnifying effect of the 59Co chemical shift in revealing structural changes. The 1H and 2H NMR data also are consistent with lengthening of the O⋅⋅⋅O distances.
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Asaro et al. (2000) studied this question.
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