MnOAc3

MnOAc3, commonly written Mn(OAc)3, is the manganese(III) acetate salt. It consists of a Mn3+ center coordinated to three acetate ligands and is typically encountered as a solid that can form hydrates or polymeric networks. In solution, Mn(III) species can be aquated, and the compound is generally soluble in acetic acid. The Mn(III) center gives the compound paramagnetic properties associated with a d4 electronic configuration.

Preparation and forms of Mn(OAc)3 are not as standardized as those for some other manganese salts. It is often prepared by oxidizing manganese(II) acetate in acetic acid or by using an oxidant such as oxygen, peroxide, or other oxidizing agents in the presence of acetate to yield Mn(OAc)3, frequently isolable as hydrates such as Mn(OAc)3·2H2O. The solid is typically moisture-sensitive and can decompose to manganese dioxide upon exposure to water or prolonged air contact.

Reactivity and applications of Mn(OAc)3 center on its role as a one-electron oxidant in acetic acid or related media. In such environments, Mn(III) species can promote radical formation and subsequent transformations of organic substrates, and Mn(OAc)3 has been used as a precursor in studies of Mn(III)-based catalytic systems, including some Mn(III)-salen-type approaches for oxidation, as well as in specialized oxidative processes in organic synthesis. Compared with more common oxidants, Mn(OAc)3 is less ubiquitous but remains of interest in research settings for exploring Mn(III) chemistry and selective oxidation strategies.

Safety and handling: Mn(OAc)3 is an oxidizing salt and should be handled with care to avoid increase in flammability hazards and potential skin or eye irritation. It is typically stored dry in tightly sealed containers, away from reductants and moisture, and handled under appropriate laboratory safety protocols.