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Eight homodinuclear lanthanide complexes prepared from a quinoline based ligand: structural diversity and single-molecule magnetism behaviour

Abstract

Eight dinuclear lanthanide complexes of compositions [Pr2L2(NO3)4(H2O)]∙EtOH (1), [Nd2L2(NO3)4(CH3CN)]∙CH3CN (2), [Sm2L2(NO3)4(CH3CN)]∙CH3CN (3), [Eu2L2(NO3)4(H2O)] (4), [Tb2L2(NO3)4] (5), [Dy2L2(NO3)4] (6), [Ho2L2(NO3)4] (7) and [Er2L2(NO3)4] (8) (HL = 2-{[(2-hydroxy-3-methoxybenzyl)imino]methyl}quinoline-2-formaldehyde) have been synthesized by the reactions of Ln(NO3)3∙6H2O with the tetradentate quinoline-based Schiff base ligand (HL) in MeCN/EtOH/NEt3 solution. The structures of 1-8 are characterized by X-ray single crystal diffraction analysis. They exhibit four distinct structures. In complex 1, two PrIII atoms are triply bridged by three oxygen atoms, including an unusual water bridge. Complexes 2 and 3 are isostructural, in which two metal centres are nine- and ten-coordinated, respectively. There are two characteristic ErIII ions in 4, which are eight- and ten-coordinated, respectively. In the isomorphous compounds 5-8, the two LnIII atoms in the centrosymmetric molecules are doubly bridged by the phenolate oxygens, and both metal ions possess nine-coordinate environments. Dc magnetic susceptibility studies in the 2–300 K range were studied for compounds 6 and 7. Antiferromagnetic interactions were determined for these two complexes. Complex 6 shows slow magnetic relaxation behaviour with energy barrier (Ueff/KB) of 14.3 K.

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Publication details

The article was received on 26 Nov 2017, accepted on 12 Feb 2018 and first published on 13 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04622G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Eight homodinuclear lanthanide complexes prepared from a quinoline based ligand: structural diversity and single-molecule magnetism behaviour

    Y. Pan, H. Zhang, Y. Qin, Y. Ge, Y. Cui, Y. Li, W. Liu and Y. Dong, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04622G

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