Decomposition of a mixed-valence [2Fe–2S] cluster gives linear tetra-ferric and ferrous clusters

Despite the ease of preparing di-ferric [2Fe–2S] clusters, preparing stable mixed-valence analogues remains a challenge, as these clusters have limited thermal stability. Herein we identify two decomposition products of the mixed-valence thiosalicylate-ligated [2Fe–2S] cluster, [Fe2S2(SArCOO)2]3− ((SArCOO)2− = thiosalicylate).

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