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Some factors controlling incorporation of labile sulfur into thiol-iron(III) complexes

Authors
Journal
Biochemical and Biophysical Research Communications
0006-291X
Publisher
Elsevier
Publication Date
Volume
49
Issue
6
Identifiers
DOI: 10.1016/0006-291x(72)90512-8

Abstract

Abstract Some thiol-iron(III) complexes, which have absorption maxima at shorter wavelength than 500 nm, react readily with sulfide ion to exhibit 2Fe 2S type ferredoxin-like absorption spectra, whereas those which have absorption maxima at longer wavelength than 500 nm, do not react similarly. These spectral features can be discussed in connection with variety in the combinations of coordinating groups in thiol ligands, size of chelate ring and existence of π-electron system. The relationship between the spectral features and the stability of chelates suggests that adequate instability of the parent thiol-iron(III) complexes is required for the incorporation of sulfide ion. The optimum pH region for this reaction is 8.0 ∼ 9.5.

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