Anchors away! Four banana-shaped ligands and two PdII ions assemble quantitatively to form a ball-shaped object with four large portals (see picture). The two PdII ions form stable, square-planar complexes with the pyridyl donors of the ligands, but can undergo further interactions with anions. Their positioning in a confined distance by the rigid ligands make them act as electrostatic anchors for dianionic guests of a certain size.
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Clever et al. (2009) studied this question.
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