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Issue 29, 2014
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Heterodinuclear MII–LnIII single molecule magnets constructed from exchange-coupled single ion magnets

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Abstract

The synthesis and characterization of four dinuclear 3d–4f complexes [MIILnIII(L)(DBM)3] (ZnDy = 1, CoY = 2, CoDy = 3·3.5CH3CN, CoGd = 4·3.5CH3CN) are reported (H2L = N,N′-dimethyl-N,N′-(2-hydroxy-3-methoxy-5-methyl-benzyl)ethylenediamine, DBM = anion of 1,3-diphenyl-propane-1,3-dione). In each of the four complexes, the MII ion occupies the internal N2O2 site whereas the LnIII ion occupies the external O4 site. There are diphenoxo bridges between the MII and LnIII ions in these complexes. The remaining coordination sites are occupied by three DBM anions. Direct current (dc) magnetic susceptibility measurements indicate the presence of intramolecular ferromagnetic interactions in complexes 3 and 4. The magnetic coupling constant, JCoGd, of complex 4 is estimated to be 0.26 cm−1 (H = −2JCoGdSCoSGd). Alternating current (ac) magnetic susceptibility studies reveal that complexes 1 and 2 show field-induced single molecule magnet behavior, with ΔE values of 36.5 K and 8.56 K, respectively. Complex 3 shows frequency dependent out-of-phase signals, indicating the presence of a slow relaxation of the magnetization, whereas complex 4 does not display slow magnetization relaxation.

Graphical abstract: Heterodinuclear MII–LnIII single molecule magnets constructed from exchange-coupled single ion magnets

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Publication details

The article was received on 12 Mar 2014, accepted on 29 Apr 2014 and first published on 29 Apr 2014


Article type: Paper
DOI: 10.1039/C4DT00740A
Citation: Dalton Trans., 2014,43, 11309-11316
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    Heterodinuclear MII–LnIII single molecule magnets constructed from exchange-coupled single ion magnets

    Q. Xie, S. Wu, W. Shi, C. Liu, A. Cui and H. Kou, Dalton Trans., 2014, 43, 11309
    DOI: 10.1039/C4DT00740A

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