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Issue 43, 2014
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Synthesis, magnetism and Mössbauer studies of tetranuclear heterometallic {FeIII2Ln2}(Ln = Gd, Dy, Tb) complexes: evidence of slow relaxation of magnetization in the terbium analogue

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Abstract

A new family of tetranuclear heterometallic assemblies, [FeIII2Gd2(H2L)42-NO3)2]·2ClO4·2CH3OH·2H2O (1), [FeIII2Dy2(H2L)42-NO3)2]·2ClO4·2CH3OH·2H2O (2), [FeIII2Tb2(H2L)42-NO3)2]·2ClO4·2CH3OH·2H2O (3), have been synthesized employing a multi-dentate Schiff-base ligand, (E)-2,2′-(2-hydroxy-3-((2-hydroxyphenylimino)methyl)-5-methylbenzylazanediyl)-diethanol (H4L), Fe(ClO4)2·6H2O, and LnIII nitrate salts. These compounds have been structurally characterized by various analytical and spectroscopic techniques. The molecular structures of 1–3 have been confirmed by single crystal X-ray crystallography. All the three complexes contain two FeIII ions at the periphery and two Ln(III) ions in the centre. The entire assembly is held together by four doubly deprotonated [LH2]2− ligands. All the three complexes (1–3) are dicationic in nature and possess an overall Z-type topology. Magnetic measurements reveal the presence of predominant ferromagnetic coupling for all the three compounds at low temperature. The presence of a frequency-dependent out-of-phase signal in the imaginary part of the ac susceptibility plot suggests a slow relaxation of magnetization for 3 (FeIII2Tb2). Furthermore, the magnetization dynamics of all the three complexes have been corroborated by Mössbauer spectroscopy.

Graphical abstract: Synthesis, magnetism and Mössbauer studies of tetranuclear heterometallic {FeIII2Ln2}(Ln = Gd, Dy, Tb) complexes: evidence of slow relaxation of magnetization in the terbium analogue

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Publication details

The article was received on 21 May 2014, accepted on 27 Aug 2014 and first published on 28 Aug 2014


Article type: Paper
DOI: 10.1039/C4DT01451K
Citation: Dalton Trans., 2014,43, 16366-16376
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    Synthesis, magnetism and Mössbauer studies of tetranuclear heterometallic {FeIII2Ln2}(Ln = Gd, Dy, Tb) complexes: evidence of slow relaxation of magnetization in the terbium analogue

    P. Bag, J. Goura, V. Mereacre, G. Novitchi, Annie. K. Powell and V. Chandrasekhar, Dalton Trans., 2014, 43, 16366
    DOI: 10.1039/C4DT01451K

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