Self-Assembly of Tetra- and Hexanuclear Circular Helicates

作者：Bernold Hasenknopf, Jean‐Maríe Lehn, Nedjia Boumediene, Annick Dupont‐Gervais, Alain Van Dorsselaer, Boris O. Kneisel, Dieter Fenske · 发表于：Journal of the American Chemical Society · 年份：1997 · DOI：10.1021/ja971204r · 被引用次数：568 · 研究领域：Supramolecular Chemistry and Complexes、Molecular Sensors and Ion Detection、Crystallography and molecular interactions

The self-assembly of the tris-bipyridine ligands B I and B II with iron(II) salts yields polynuclear complexes displaying structures of cyclic double-helix type, termed circular helicates [ n ] cH (of order n ). With B I in which the bipyridine units in the ligand are connected by ethylene bridges, penta- or hexanuclear architectures [5] cH and [6] cH are obtained, depending on the anion present during the self-assembly process. The elongated tris-bipyridine ligand B II with oxypropylene bridges forms a tetranuclear circular helicate [4] cH, whose structure has been confirmed by crystal structure determination. The possible oligomeric combinations of tris-bipy ligands and iron(II) ions may be considered to constitute the potential members of a virtual combinatorial library, generated via dynamic combinatorial chemistry, from which a specific real constituent of the virtual set of circular helicates is expressed in given conditions.