Self-Assembly of Tetra- and Hexanuclear Circular Helicates

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, pent...

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Bibliographic Details
Published in:Journal of the American Chemical Society 1997-11, Vol.119 (45), p.10956-10962
Main Authors: Hasenknopf, Bernold, Lehn, Jean-Marie, Boumediene, Nedjia, Dupont-Gervais, Annick, Van Dorsselaer, Alain, Kneisel, Boris, Fenske, Dieter
Format: Article
Language:English
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Summary: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.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja971204r