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Studies on reactions of imidazole with two iron(III) porphyrin dimers in aqueous solution

✍ Scribed by Albert N. Thompson; M. Krishnamurthy

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
539 KB
Volume
34
Category
Article
ISSN
0020-1693

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✦ Synopsis

Kinetics of the reactions of imtdazole with u-oxobis(tetrakis(p-su~ophenyl)porphyrinatoiron(III)),

VFeTPPS)sOl , and uoxo-bis(tetrakis(p-trimethyl- ammoniumphenyl)porphyrinatoiron(II.I)), [(Fe-TAPP),O] , were investigated at 30 "C and 0.1 F (NaNOJ) ionic strength. The compound (FeTPPS)20 reacts at least forty times faster than (FeTAPP)20. From the pH dependence of this reaction, the reacting ligand species is inferred to be imidazolium ions. Rate laws and possible mechanisms of these reactions are discussed. Spectrophotometric titration was employed to determine the equilibrium constants of these reactions.

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