Enneamolybdomanganate(IV), [MnIV-Mo9O32]6−, so-called Waugh-type heteropolyanion, has a chirality based on the D3 symmetry around an MnO6 octahedron. Attempts to resolve the racemic polyanion have been unsuccessful. A Pfeiffer effect was observed for the tetrabutylammonium salt in organic media containing l-brucine sulfate as an environment substance. This is the third example of heteropolyanions which show an optical activity.
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Nomiya et al. (1983) studied this question.
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