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An Aromatic Anion Receptor: Anion–π Interactions do Exist


  • Financial support from COST Action D21/003/2001 and the Dutch National Research School Combination Catalysis (HRSMC and NIOK) are thankfully acknowledged.


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A particularly challenging task is the design of anion receptors, because anions are larger than cations and are pH- and solvent-sensitive. The first host for anionic guests is a dendritic octadentate N ligand, which upon reaction with CuCl2, encapsulates chloride ions (Cl6, see picture) as guests by means of anion–π interactions in an electron-deficient cavity formed by four pyridine rings.

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