Issue 2, 1987

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

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.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1987, 369-371

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

P. Ascenzi, M. Brunori, G. Pennesi, C. Ercolani and F. Monacelli, J. Chem. Soc., Dalton Trans., 1987, 369 DOI: 10.1039/DT9870000369

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