Equilibrium and kinetic study of the reaction between phthalocyaninato- iron(ii) and carbon monoxide in dimethyl sulphoxide

Claudio Ercolani, Fabrizio Monacelli, Giovanna Pennesi, Gentilina Rossi, Eraldo Antonini, Paolo Ascenzi, Maurizio Brunori

Research output: Contribution to journalArticle

Abstract

The reaction between carbon monoxide and phthalocyaninatoiron(ll) in dimethyl sulphoxide (dmso) has been studied kinetically and from the equilibrium point of view. In the presence of a large excess of CO, the iron complex adds carbon monoxide in a 1: 1 mole ratio via pseudo-first-order kinetics. The observed rate constant has the form kobc = K1[CO] + kr with kt = 1.28 ± 0.05 103 dm3 mol-1s-1 and kt = 0.12 ± 0.02 s-1 at 20 °C. The equilibrium constant K is close to 1 x 104 dm3 mol-1 and is virtually independent of temperature. The effect of temperature on the rate constants has been investigated and the activation parameters determined; their mechanistic implications are discussed.

Original languageEnglish
Pages (from-to)1120-1123
Number of pages4
JournalJournal of the Chemical Society, Dalton Transactions
Issue number5
DOIs
Publication statusPublished - 1981

ASJC Scopus subject areas

  • Chemistry(all)

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