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Issue 20, 2010
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Synthesis, structures and magnetic properties of a series of 3d-4f tetranuclear CoII2LnIII2 cubanes

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Abstract

The reaction of 2,6-pyridinedimethanol (pdmH2), CoCl2·6H2O, Ln(NO3)3·6H2O and pivalic acid (pivH) in the presence of triethylamine in MeCN and CH2Cl2 under ambient conditions results in the tetranuclear heterobimetallic compounds [CoII2Ln2(pdmH)4(Piv)6]·4CH3CN (Ln = Y (1), Gd (2), Tb (3), Ho (4)) and [CoII2Dy2(pdmH)4(Piv)6]·2CH3CN (5). The molecular structures of 1–5 were determined by single-crystal X-ray diffraction and reveal that they are isostructural. However, compounds 1–4 crystallize in the monoclinic space group P21/n, while compound 5 crystallizes in the orthorhombic space group Pnna. In all of these compounds, the four metal ions are held together by four alkoxide μ3-RCH2O bridges to form novel Co2Ln2O4-heterocubanes. Magnetic properties of 1–5 have been investigated using dc and ac susceptibility measurements. Of these compounds, only compound 5 displays an out-of-phase signal in the ac susceptibility and exhibits slow relaxation of the magnetization, which is attributed to the presence of the anisotropic DyIII ions.

Graphical abstract: Synthesis, structures and magnetic properties of a series of 3d-4f tetranuclear CoII2LnIII2 cubanes

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Publication details

The article was received on 11 Feb 2010, accepted on 22 Mar 2010 and first published on 17 Apr 2010


Article type: Paper
DOI: 10.1039/C002841J
Citation: Dalton Trans., 2010,39, 4911-4917
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    Synthesis, structures and magnetic properties of a series of 3d-4f tetranuclear CoII2LnIII2 cubanes

    X. Zhao, Y. Lan, B. Zhao, P. Cheng, C. E. Anson and A. K. Powell, Dalton Trans., 2010, 39, 4911
    DOI: 10.1039/C002841J

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