Structure and kinetics of oxidation of amphiphilic ...

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Title Structure and kinetics of oxidation of amphiphilic nickel(II) pentaazamacrocycles by peroxodisulfate and by a nickel(III) pendant-arm macrocycle
Author(s) Robert I. Haines, J. E. Rowley
Journal Journal of Inclusion Phenomena and Macrocyclic Chemistry
Date 2003
Volume 47
Issue 1-2
Start page 25
End page 32
Abstract Three nickel(II) pentaazamacrocycles bearing pendant alkyl tails have been synthesized, and the crystal structure of one (bearing an octyl tail) is reported. The redox potentials of the complexes, for oxidation of the nickel(II) centre, is 0.72 V (versus S. H. E.) in all cases, indicating that the pendant alkyl tails have no effect on the redox site. The kinetics of oxidation of the complexes by peroxodisulfate, S2O82- and by aqua(5, 5, 7, 12, 12, 14-hexamethyl-1,4,8,11-tetraazacyclotetradecane-1-acetato)nickel(III), [Ni(hmca)(OH2)](2+) have been studied. Oxidation by S2O82- occurs by ion-pairing of the reactants, followed by electron transfer with concomitant peroxo bond fissure. Oxidation by [Ni(hmca)(OH2)](2+) occurs by an outer sphere electron transfer process. Redox kinetics at the nickel centre provides a probe for supramolecular interactions at the pendant tails in such complexes.

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