An unprecedented-type intramolecular redox reaction of solid tetraamminecopper(2+) bis(permanganate) ([Cu(NH3)4](MnO4)2) - A low-temperature synthesis of copper dimanganese tetraoxide-type (CuMn2O4) nanocrystalline catalyst precursors

László Kótai, Kalyan K. Banerji, István Sajó, János Kristóf, B. Sreedhar, Sándor Holly, Gábor Keresztury, Antal Rockenbauer

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12 Citations (Scopus)


Tetraamminecopper(2+) bis(permanganate) ([Cu(NH3)4](MnO4)2; 1) was prepared, and its properties were studied in both aqueous solution and the solid phase. The presence of H-bond interactions between the ammonia ligand of the complex cation and an O-atom of the permanganate ion was detected by [R and Raman methods. The solid-phase thermal deammoniation of 1 led to an unusual intramolecular redox reaction between the Mn-O⋯H-N linkage with formation of NH4NO3 and CuMn2O4-type mixed oxides instead of stepwise deammoniation, even below 100°. The thermal deammoniation of 1 in aqueous solution led, instead of to hydrated copper(2+) bis(permanganate), to the formation of NH4MnO4 (2). Since the temperature of the thermal deammoniation of 1 is lower than the decomposition temperature of the permanganate ion, the regulated solid-phase decomposition of 1 allowed preparation of CuMn204-type oxides with mixing of copper and manganese at the atomic level.

Original languageEnglish
Pages (from-to)2316-2327
Number of pages12
JournalHelvetica Chimica Acta
Issue number8
Publication statusPublished - Sep 18 2002


ASJC Scopus subject areas

  • Catalysis
  • Biochemistry
  • Drug Discovery
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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