Electron attachment and compound formation in flames. VI. Negative ion and compound formation in flames containing rhenium and potassium

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Abstract
The addition of rhenium−containing additives to H2/O2/N2 flames containing potassium is shown to result in reductions in the concentrations of free potassium and electrons and in the production of the negative ions ReO4− and ReO3−. The observations can be qunantitatively accounted for by the following reaction schemes and thermochemical data: K + HReO4 ? KReO4 + H, ΔH0° = −49±50 kJ mole−1; e− + HReO4 ? ReO4− + H, ΔH0° = 18±50 kJ mole−1; H + ReO4− ? ReO3− + OH, ΔH0° = 136±50 kJ mole−1. These enthalpy changes imply that the electron affinities of ReO3 and ReO4 are approximately 290 kJ mole−1 and 430 kJ mole−1, respectively.