The direct synthesis of alkali-metal pentafluoromanganates(III)

Abstract

The reduction of potassium permanganate with acetylacetone in the presence of an excess of alkali-metal difluoride AHF₂(A = NH₄, Na, K, or Cs) readily gives pentafluoromanganates(III), A₂[-MnF₅](A = NH₄ or Na) or A_2–[MnF₅]·H₂O (A = K or Cs) in almost quantitative yield. Characterisation of the compounds was made from the results of i.r. spectral studies, chemical analyses, magnetic susceptibility measurements, and chemical determination of oxidation states of manganese in the various compounds.