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The simple reaction of a tris-bpy ligand strand with FeCl2 leads to the self-assembly of the unique cation 1, which consists of a torus formed by five ligands wrapped around five FeII ions in a double-helical fashion and closed around a central chloride ion. This structure, a fivefold circular helicate, is a helicate analogue of circular DNA.
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Hasenknopf et al. (1996) studied this question.
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