Kinetics of the thermal and photochemical decomposition of aquapentacyanoferrate(III) in aqueous solution |
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Authors: | Silvia E. Ronco Pedro J. Aymonino |
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Affiliation: | (1) Programa QUINOR, Química Inorgánica, Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, (1900) La Plata, República Argentina |
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Abstract: | Summary The kinetics of the thermal and photochemical decomposition of aquapentacyanoferrate(III) ion in aqueous solution in the presence ofo-phenanthroline was studied spectrophotometrically. The first-order rate constant (k) at 30° C [I=1 M(NaCl)] for the thermal reaction is (1.49±0.13)×10–6 s–1 with H=(158±7)kJ mol–1 and S=(42±4) JK–1 mol–1. The initial quantum yield for the photochemical reaction at pH=7 is independent of the light intensity and is (1.49±0.33)×10–2 mol einstein–1.A communication on this subject was presented at the XVI Latinamerican Chemistry Congress held at Rio de Janeiro. Brasil, October 14–20, 1984. |
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