Kinetics and mechanism of water substitution in the low-spin Fe(II) complex of 4-octasulfophenylpyrazinoporphyrazine

Dalton Transactions : an International Journal of Inorganic Chemistry
Evgeny V KudrikSergei V Makarov

Abstract

The substitution reaction of the axial-coordinated water by pyridine, pyrazine and 4-CN-pyridine in the low-spin Fe(II) complex of octasulfophenyltetrapyrazinoporphyrazine was studied. Kinetic and thermodynamic parameters for the different reaction steps of the process were determined. On the basis of NMR data and spectrophotometric titrations, a pronounced non-equivalence of the two coordinated N-donor ligands was observed. The substitution of water by pyridine and 4-CN-pyridine is shown to include the formation of a precursor outer-sphere complex, whereas substitution by pyrazine follows a limiting dissociative mechanism.

Citations

Dec 6, 2014·Journal of the American Chemical Society·José Clayston Melo PereiraPeter C Ford
Mar 2, 2005·Dalton Transactions : an International Journal of Inorganic Chemistry·Evgeny V KudrikSergei V Makarov
Dec 22, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Elena A VlasovaRudi van Eldik

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