Beiträge zur Chemie der Oxidhalogenide von Molybdän und Wolfram,VIII. WOBr3, WOBr2-Bildungsenthalpie und thermische Zersetzung |
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| Authors: | H Oppermann G Stver G Kunze |
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| Institution: | H. Oppermann,G. Stöver,G. Kunze |
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| Abstract: | WOBr3 and WOBr2 were prepared by chemical transport reactions. From the solution enthalpy of WOBr3 in NaOH/H2O2 the formation enthalpy ΔH°(WOBr3,f,298) = ?113,2(±0,9) kcal/Mol was calculated. The thermal decomposition of WOBr3 proceeds primarly according to 2 WOBr3 = WOBr2 + WOBr4. The decomposition of WOBr2 may be described by the reaction 2 WOBr2 = WBr2 + WO2Br2. The interpretation of the decomposition equilibrium of WOBr3 gives the values ΔH°(WOBr2,f,298) = ?116,9(±5) kcal/Mol, and S°(WOBr3,f,298) = 46(±5) cl. |
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