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The unusually low magnetic moments of octanuclear complexes containing [Fe4S4(NCMLn)4] cluster ions (shown below) are unprecedented in the chemistry of Fe4S4 clusters and ferredoxins. The new compounds are redox-active mixed-valence complexes containing iron centers in the oxidation state +2.5 and show intense intervalence transfer absorptions.
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Zhu et al. (1996) studied this question.
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