Abstract
The dinuclear iron-nitrosyl complex [Fe 2(SMe) 2(NO) 4] can be isolated from reactions between methionine and iron(II) sulphate or chloride in the presence of sodium nitrite, under a range of experimental conditions; the analogous complex [Fe 2(SEt) 2(NO) 4] is formed in similar reactions using ethionine in place of methionine. Spectroscopic evidence supports the formation of similar dinuclear complexes [Fe 2(SR) 2(NO) 4], as well as the tetranuclear [Fe 4S 3(NO) 7] − in reactions between iron(II), nitrite and certain cysteine and penicillamine derivatives.
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