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Solvent and salt effects on the kinetics of the reaction between [Ru(NH3)5pz]2+ and [Fe(CN)5H2O]3–

✍ Scribed by R. Prado-Gotor; A. Ayala; A. B. Tejeda; M. B. Suárez; C. Mariscal; M. D. Sánchez; G. Hierro; A. Lama; A. Aldea; R. Jiménez

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 112 KB
Volume: 35
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.10132

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✦ Synopsis

Abstract

The kinetics of replacement of H~2~O by [Ru(NH~3~)pz]^2+^ (pz = pyrazine) in [Fe(CN)~5~H~2~O]^3−^ have been studied in various concentrated electrolyte solutions and in various water–cosolvent mixtures, at 298 K. Salt and cosolvent effects can be rationalized taking into account specific medium effects on both the encounter complex formation process and the ligand‐substitution process, once the encounter complex is formed. These effects in water–cosolvent mixtures depend on the solvation of the reactants by the components of the mixture, as well as on the solvent–solvent interactions in these mixtures. Salt effects seem to be related to a primary salt effect as well as to the effect of the cations on the electronic density on the iron complex. © 2003 Wiley Periodicals, Inc. Int J Chem Kinet 35: 367–373, 2003

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