Abstract
The preparation, characterization, and thermal decomposition of CU(NH 3) 4CrO 4 are reported. The decomposition of the complex is monitored by thermal analysis. Decomposition is by two steps: the first near 150°C; the second near 210°C. Each step corresponds to the release of two moles of NH 3 per mole of complex. The end product is identified by elemental analysis and magnetic susceptibility measurements as CuCrO 4 and is stable and water insoluble. Activation energies for the low temperature and high-temperature reactions are 18 kcal/mole and 39 kcal/mole, respectively. At 251°C the two reaction rates are equal and the reactions proceed as though the conversion were from Cu(NH 3) 4CrO 4 to CuCrO 4.
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