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Issue 24, 2014
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Octanuclear [NiII4LnIII4] complexes. Synthesis, crystal structures and magnetocaloric properties

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Abstract

Two original heterooctanuclear [NiII4LnIII4] complexes (LnIII = SmIII, GdIII) have been obtained starting from the [NiII(valpn)(H2O)2] mononuclear precursor [H2valpn = 1,3-propanediylbis(2-iminomethylene-6-methoxy-phenol)] and the corresponding lanthanide nitrates, in the presence of azide anions, through slow capture of atmospheric CO2. Three weak and competitive exchange interactions, JGdGd, JGdNi, JNiNi, make the ground state of this magnetic system degenerate at cryogenic temperature and zero field. This, along with the high spin of GdIII, lead to a significant magnetocaloric effect spread in the temperature range 1 to 20 K (ΔSm[0–7 T, 3.5 K] = 19 J kg−1 K−1).

Graphical abstract: Octanuclear [NiII4LnIII4] complexes. Synthesis, crystal structures and magnetocaloric properties

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Publication details

The article was received on 18 Feb 2014, accepted on 20 Mar 2014 and first published on 20 Mar 2014


Article type: Paper
DOI: 10.1039/C4DT00515E
Citation: Dalton Trans., 2014,43, 9136-9142
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    Octanuclear [NiII4LnIII4] complexes. Synthesis, crystal structures and magnetocaloric properties

    T. D. Pasatoiu, A. Ghirri, A. M. Madalan, M. Affronte and M. Andruh, Dalton Trans., 2014, 43, 9136
    DOI: 10.1039/C4DT00515E

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