An [FeII3O]4+ core in a candy wrapper: 3,5-Bis(pyridin-2-yl)pyrazolate (L−) and iron(II) ions undergo homochiral self-assembly into a bis(triple-helical) cluster (see picture), in which a triangular [FeII3O]4+ core (Fe orange and yellow, O red) is surrounded by two [FeIIL3]− units (Fe purple, L− gray).
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Yoneda et al. (2006) studied this question.
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