Chalcogenolates of the smaller lanthanides (Ln) react with elemental chalcogen to give the first examples of cubane clusters containing Ln ions. Both (py)8Yb4Se4(SePh)4 and (py)10Yb6S6(SPh)6 were isolated; the Se compound exhibits the familiar M4E4 structural motif, while the S compound is best described as a double cube. Both structures reveal unusual trends in Yb−chalcogenido bond lengths.
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Freedman et al. (1998) studied this question.