(⁵⁵Mn) Manganese NMR

⁵⁵Manganese (⁵⁵Mn) is the only NMR active nucleus of manganese. It is a high sensitivity nucleus that yields moderately broad lines (fig. 1) in symmetric environments over a very wide chemical shift range. For larger complexes and molecules, the signals become too broad to observe with a high-resolution NMR spectrometer. Oxidation states, (-I), (O), (I) and (VII) of manganese are diamagnetic and yield observable signals for small complexes. Other oxidation states are paramagnetic and cannot be observed by high-resolution NMR. Manganese NMR is used for studying small complexes of manganese and manganese binding. There is little information available about chemical shifts (fig. 2).

Fig. 1. ⁵⁵Mn-NMR spectrum of KMnO₄ (sat.) in D₂O

Fig. 2. Chemical shift ranges for manganese NMR

Properties of ⁵⁵Mn

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Safety note

Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, manganese compounds are toxic and KMnO₄ is oxidizing: wear gloves.