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Simplified scheme showing the positions of incorporation of bridging selenide atoms in four different types of cluster cores as determined by X-ray structure analysis (adapted from ref. 128). Terminal ligands omitted for clarity are the following: W-Tp*, all clusters; Fe-Cl, single cubanes; Fe-PEt3, EBDCs; Fe-QH, PN-type. See ref. 128 for reaction stoichiometries and a detailed discussion of the scheme.
