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

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

doi:10.1039/DT9870000369

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

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

Istituto Nazionale per le Malattie Infettive Lazzaro Spallanzani

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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 k_obs. = k_f[NO], i.e. with and intercept close to zero and a slope k_f = (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 (k_f) for the binding of NO, the dissociation rate constant (k_r) 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 language	English
Pages (from-to)	369-371
Number of pages	3
Journal	Journal of the Chemical Society, Dalton Transactions
Issue number	2
DOIs	https://doi.org/10.1039/DT9870000369
Publication status	Published - 1987

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@article{2161032f73344ec6b150d469ca6114e3,

title = "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.",

author = "Paolo Ascenzi and Maurizio Brunori and Giovanna Pennesi and Claudio Ercolani and Fabrizio Monacelli",

year = "1987",

doi = "10.1039/DT9870000369",

language = "English",

pages = "369--371",

journal = "Journal of the Chemical Society. Dalton Transactions",

issn = "1472-7773",

publisher = "Royal Society of Chemistry",

number = "2",

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TY - JOUR

T1 - Equilibrium and kinetic study of nitric oxide binding to phthalocyaninatoiron(II) in dimethyl sulphoxide

AU - Ascenzi, Paolo

AU - Brunori, Maurizio

AU - Pennesi, Giovanna

AU - Ercolani, Claudio

AU - Monacelli, Fabrizio

PY - 1987

Y1 - 1987

N2 - 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.

AB - 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.

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DO - 10.1039/DT9870000369

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JO - Journal of the Chemical Society. Dalton Transactions

JF - Journal of the Chemical Society. Dalton Transactions

SN - 1472-7773

IS - 2

ER -

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

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