- 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
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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.
- Kotai, Laszlo,Banerji, Kalyan K.,Sajo, Istvan,Kristof, Janos,Sreedhar,Holly, Sandor,Keresztury, Gabor,Rockenbauer, Antal
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p. 2316 - 2327
(2007/10/03)
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