Magnetic Coupling in Enantiomerically Pure Trinuclear Helicate‐Type Complexes Formed by Hierarchical Self‐Assembly |
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| Authors: | Markus Albrecht Prof. Dr. Marcel Fiege Dr. Paul Kögerler Prof. Dr. Manfred Speldrich Dr. Roland Fröhlich Dr. Marianne Engeser Dr. |
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| Affiliation: | 1. Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49)?241‐8092385;2. Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany);3. Institut für Organische Chemie, Universit?t Münster, Corrensstrasse 40, 48149 Münster (Germany);4. Kekule‐Institut für Organische Chemie und Biochemie, Universit?t Bonn, Gerhard‐Domagk‐Strasse 1, 53121 Bonn (Germany) |
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| Abstract: | Based on chiral, enantiomerically pure 7‐[(S)‐phenylethylurea]‐8‐hydroxyquinoline ( 1 ‐H), trinuclear helicate‐type complexes 2 – 5 are formed with divalent transition‐metal cations. X‐ray structural analyses reveal the connection of two monomeric complex units [M( 1 )3]? (M=Zn, Mn, Co, Ni) by a central metal ion to form a “dimer”. Due to the enantiopurity of the ligand, the complexes are obtained as pure enantiomers, resulting in pronounced circular dichroism (CD) spectra. Single‐ion effects and intra‐ and intermolecular coupling are observed with dominating ferromagnetic coupling in the case of the cobalt(II) and nickel(II) and dominating antiferromagnetic coupling in the case of the manganese(II) complex. |
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| Keywords: | chirality coordination compounds helicates magnetic properties self‐assembly |
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