Abstract
This Account describes the formation and chemical reactivities of the novel butterfly Fe/S cluster anions (μ-S-)2Fe2(CO)6 (I), (μ-S-)(μ-RS)Fe2(CO)6 (II), (μ-S-)(μ-RS)[Fe2(CO)6]2(μ4-S) (III), (μ-S-)(μ-RS)[Fe2(CO)6]3(μ4-S)2 (IV), and {(μ-S-)(μ4-S)[Fe2(CO)6]2}2(μ-SZS-μ) (V). It also gives a description of the novel structures, unique properties, and wide applications of the corresponding butterfly Fe/S cluster complexes produced from these anions. Anions I−V along with their products are important in the development of organometallic chemistry, cluster chemistry, catalysis, and material and life sciences.

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