Abstract
Seven dinuclear lanthanide complexes of formulae Ln2L2 (Ln = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5)), Ho2L2·MeCN (6) and Er2L2·MeCN (7) (H3L = 2-{[bis(2-hydroxy-3-ethoxybenzyl)(aminoethyl)amino]methyl}phenol) have been synthesized by the reactions of Ln(NO3)3∙6H2O with the hydroxyl-rich ligand H3L in MeCN/NEt3 solution. The structures of the isostructural complexes 1–7 were determined by single-crystal X-ray crystallography. X-ray crystallography analyses reveal that each compound is neutral and consists of two metal centers and two triply-deprotonated ligands. The two Ln(III) atoms in 1–7 are doubly bridged by two phenolato oxygen atoms of two L3− ligands. Each of the two lanthanide ions is seven-coordinated and possesses capped trigonal prism geometry. Dc magnetic susceptibility studies in the 2–300 K range reveal probably weak antiferromagnetic interaction for 3–7. Complex 5 exhibits frequency dependence of the ac-susceptibility typical of single-molecule magnets.
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