Micellar effects on a ligand substitution reaction: Kinetics of the formation of [Fe(CN)5(μ-pz)Ru(NH3)5]−, from [Fe(CN)5H2O]3− and [Ru(NH3)5pz]2+, in the presence of anionic micelles

The kinetics of substitution of H2O by Ru(NH3)5pz2+ (pz = pyrazine) in Fe(CN)5H2O3− have been studied in micellar aqueous solutions of sodium dodecylsulfate (SDS). Experimental results are discussed by using an approach based on the transition‐state theory. This approach is better than others based...

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Published in:International journal of chemical kinetics 2004-12, Vol.36 (12), p.627-633
Main Authors: Jiménez, Rafael, Bueno, Elena, Cano, Israel, Corbacho, Elizabeth, Fernández, M. Eugenia, Gómez, Lidia, Graciani, Jesús, Hernández, María, Matitos, M. Teresa, Ortíz, José, López-Cornejo, Pilar, Prado-Gotor, Rafael
Format: Article
Language:English
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Summary:The kinetics of substitution of H2O by Ru(NH3)5pz2+ (pz = pyrazine) in Fe(CN)5H2O3− have been studied in micellar aqueous solutions of sodium dodecylsulfate (SDS). Experimental results are discussed by using an approach based on the transition‐state theory. This approach is better than others based on the pseudophase model, which can also be used, because it is able to give a clear meaning to the parameters of the model. Trends in the observed reactivity are explained by a change in the degree of association of one of the reactants to the micelles (Ru(NH3)5pz2+ in the present work). This association is governed by an equilibrium constant that depends on the electrostatic potential at the surface of the micelles. © 2004 Wiley Periodicals, Inc. Int J Chem Kinet 36: 627–633, 2004
ISSN:0538-8066
1097-4601
DOI:10.1002/kin.20038