H2O/Triton X-100 Solvent Effect in the Micellar Catalysis of the Aquation of Tris-(3,4,7,8-tetramethyl-1,10-phenantroline)iron(II)

DOI: 10.1039/f19888400001

Source and publish data:

Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1 - 8 (1988)

Update date:2022-08-30

Topics:

Authors:

Ige, Jide

Lambi, John N.

Soriyan, Oladega O.

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Article abstract of DOI:10.1039/f19888400001

The effect of triton X-100 micelles on the aquation of Fe(Me4phen)3²⁺ has been investigated with triton X-100 as solvent.In liquid triton X-100, over a range of _T (0.2-2.0 mol dm^-3), significant rate enhancement factors of 35-140 are observed.Acid inhibits the rate of aquation at fixed _T.A mechanism based on effective solvent participation in a chemical environment similar to that in reversed micelles is proposed in liquid triton X-100 with dispersed water pockets.This mechanism predicts direct H2O substitutions into the coordination sphere of Fe(Me4Phen)3²⁺ in the highly polar water pockets or cavities where the Fe^II complex molecules are solubilized.Changes in the tumbling rate, mobility, structure, nucleophilicity and activity of water are suggested to account for the observed changes in the rate of aquation as a function of _T, in the peculiar chemical environment of the water pockets.All k_ψ-_T profiles are structured and exhibit maxima with k_ψ(max) shifted to progressively higher _T as the fixed concentration of +>_T is increased.

Full text of DOI:10.1039/f19888400001

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