Ten defined chiral centers are present in the [15]metallacrown-5 complex that is assembled in a one-step reaction from L-tyrosinehydroxamic acid, CuII, and GdIII. Nitrate ions bind selectively to this complex in a cavity of dimension 776 Å3, while chloride binds to the outer face (see picture).
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Cutland et al. (2000) studied this question.
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