Equilibrium and kinetic study of nitric oxide binding to phthalocyaninatoiron(II) in dimethyl sulphoxide

Paolo Ascenzi, Maurizio Brunori, Giovanna Pennesi, Claudio Ercolani, Fabrizio Monacelli

Research output: Contribution to journalArticlepeer-review

Abstract

The equilibrium and kinetics of the reaction between nitric oxide and phthalocyaninatoiron(II), [Fe(pc)], in dimethyl sulphoxide (dmso) has been studied at 20 ± 0.5 °C. In the presence of a large excess of NO, [Fe(pc)] binds nitric oxide in a 1:1 mol ratio via pseudo-first-order kinetics. The observed rate constant has the general form kobs. = kf[NO], i.e. with and intercept close to zero and a slope kf = (2.2 ± 0.4) × 104 dm3 mol-1s-1. From the values of the equilibrium constant [K = (1.1 ± 0.1) × 106 dm3 mol-1] and second-order rate constant (kf) for the binding of NO, the dissociation rate constant (kr) has been estimated to be (2.0 ± 0.4) × 10-2s-1. The present results are discussed in the light of related previous investigations.

Original languageEnglish
Pages (from-to)369-371
Number of pages3
JournalJournal of the Chemical Society, Dalton Transactions
Issue number2
DOIs
Publication statusPublished - 1987

ASJC Scopus subject areas

  • Chemistry(all)

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