Premium
Magnetic Coupling in Enantiomerically Pure Trinuclear Helicate‐Type Complexes Formed by Hierarchical Self‐Assembly
Author(s) -
Albrecht Markus,
Fiege Marcel,
Kögerler Paul,
Speldrich Manfred,
Fröhlich Roland,
Engeser Marianne
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200903108
Subject(s) - crystallography , manganese , dimer , nickel , circular dichroism , chemistry , ligand (biochemistry) , cobalt , metal , monomer , enantiomer , chirality (physics) , transition metal , magnetic circular dichroism , stereochemistry , inorganic chemistry , spectral line , polymer , organic chemistry , catalysis , physics , biochemistry , nambu–jona lasinio model , receptor , chiral symmetry breaking , quantum mechanics , astronomy , quark
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.