Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 29, Pages 8797-8804Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200903108
Keywords
chirality; coordination compounds; helicates; magnetic properties; self-assembly
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Funding
- Deutsche Forschungsgemeinschaft
- Fonds der Chemischen Industrie
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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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