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The novel title double-butterfly Fe/S cluster complex, [Fe4(C4H8S2)2(CO)12], which is structurally similar to the active site of the Fe-only hydrogenases, contains two inversion-related Fe2S2(CO)6 subcluster cores connected by two equivalent butyl chains to afford a 16-membered macrocycle. The formation of the 16-membered macrocycle has an influence on the C-S-Fe angles, while the Fe-Fe and Fe-S bond lengths remain similar to those in related complexes.
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