Tetraamminezinc(II) dipermanganate ([Zn(NH 3 ) 4 ](MnO 4 ) 2 ; 1) was prepared, and its structure was elucidated with XRD-Rietveld-refinement and vibrational-spectroscopy methods. Compound 1 has a cubic lattice consisting of a 3D H-bound network built from blocks formed by four MnO

Tetraamminecadmium(II)] bis(permanganate) (1) was prepared and its crystal structure was elucidated with XRD-Rietveld refinement and vibrational spectroscopic methods. Compound 1 has a cubic lattice consisting of a 3D hydrogen-bonded network built as four by four distorted tetrahedral blocks of [Cd(NH 3 ) 4 ] 2+ cations and MnO 4 anions, respectively. The other four permanganate ions are located in a crystallographically different environment, placed in the cavities formed by the attachment of the building blocks. A low-temperature (≈100°C) solid phase quasi-intramolecular redox reaction producing ammonium nitrate and amorphous CdMn 2 O 4 could be established. Neither solid phase nor aqueous solution phase thermal deammoniation of compound

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Two convenient methods were developed to transform KMnO 4 into barium permanganate and other permanganate salts via BaMnO 4 or Mn 2 O 7 intermediates. Pure BaMnO 4 was prepared by the reaction of KMnO 4 with KI in the presence of BaCl 2 and NaOH. Hydrothermal reaction of barium manganate with excess carbon dioxide for 1.5 h at 100°C led to barium-permanganate with almost quantitative yield. Mn 2 O 7 was prepared by means of the reaction of KMnO 4 and sulfuric acid monohydrate in a two-1257 carbonate and catalytic amount of water barium permanganate could be obtained with a moderate yield. Similarly, other permanganate salts (Zn, Cd, Cu, Mg, Ca, Ni, Al, Fe, Ce, rare earth metals) were prepared by substituting the BaCO 3 for the appropriate metal oxides, hydroxides or carbonates.