Equilibrium and kinetic study of the reaction between phthalocyaninatoiron(II) and carbon monoxide in dimethyl sulphoxide

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Abstract
The reaction between carbon monoxide and phthalocyaninatoiron(II) 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 kobs.=kf[CO]+kr with kf= 1.28 ± 0.05 × 103 dm3 mol–1 s–1 and kr= 0.12 ± 0.02 s–1 at 20 °C. The equilibrium constant K is close to 1 × 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.