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Issue 31, 2013
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Synthesis, crystal structure and magnetic properties of dinuclear NiIILnIII complexes based on a flexible polydentate ligand

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Abstract

The synthesis and characterization of three isomorphous complexes [NiII(L)LnIII(DBM)3] (Ln = Gd (1·2.5CH3CN·0.5H2O), Tb (2·2CH3CN·0.5MeOH), and Dy (3·2CH3CN·0.5MeOH·0.5H2O)) are reported (H2L = N,N′-dimethyl-N,N′-(2-hydroxy-3-methoxy-5-methylbenzyl)ethylenediamine, DBM = anion of 1,3-diphenylpropane-1,3-dione). The flexible ligand L2− contains an N2O2-inner and an O4-outer coordination site. There are diphenoxo bridges between NiII and LnIII ions in these complexes. The remaining coordination sites are occupied by DBM anions. Direct current (dc) magnetic susceptibility measurements indicate the presence of intramolecular ferromagnetic interactions in desolvated complexes 1–3. The magnetic coupling constant JNiGd in complex 1 is estimated to be 1.11 cm−1 (H = −2JNiGdSNiSGd). Alternating current (ac) magnetic susceptibility studies reveal that complexes 2 and 3 show frequency-dependent out-of-phase signals, which indicate that they exhibit SMM behavior. The energy barriers for complexes 2 and 3 under a 2 kOe applied direct current (dc) magnetic field are estimated from Arrhenius plots to be 14.4 and 11.3 K, respectively.

Graphical abstract: Synthesis, crystal structure and magnetic properties of dinuclear NiIILnIII complexes based on a flexible polydentate ligand

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Publication details

The article was received on 27 Mar 2013, accepted on 30 May 2013 and first published on 31 May 2013


Article type: Paper
DOI: 10.1039/C3DT50818H
Citation: Dalton Trans., 2013,42, 11227-11233
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    Synthesis, crystal structure and magnetic properties of dinuclear NiIILnIII complexes based on a flexible polydentate ligand

    Q. Xie, S. Wu, C. Liu, A. Cui and H. Kou, Dalton Trans., 2013, 42, 11227
    DOI: 10.1039/C3DT50818H

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