Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 7, Pages 1530-1537Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.200300486
Keywords
heterometallic complexes; copper; lanthanides; macrocyclic ligands; template synthesis; magnetic properties
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Until now, the known structures of heterodinuclear Cu-Ln complexes involve compartmental Schiff-base ligands with saturated diamino chains. We report here two Cu-Ln complexes (Ln = Gd or Ce) which are the first structurally characterized Cu-Ln entities involving S-methylisothiosemicarbazide as the diamino bridge, with open chain and macrocyclic ligands. The macrocyclic Cu-Gd entity is a well isolated dinuclear complex whereas two hydrogen bonds join together a pair of binuclear Cu-Ce complexes to give tetra nuclear {Cu-Ce...Ce-Cu} entities. The Cu-Gd complexes [H = -J(SCuSGd)] exhibit ferromagnetic interactions between 5 and 5.5 cm(-1). Since the Cu-Ce complexes do not follow the Curie law due to the presence of orbital degeneracy, an analysis based on a simple spin-only Hamiltonian is not possible. Nevertheless, the EPR spectra of the Cu-Ce complexes do confirm the existence of magnetic interactions. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004).
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