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Functionalized nitronyl nitroxide biradical bridged one-dimensional lanthanide chains: slow magnetic relaxation in the Tb and Dy analogues

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Abstract

The functionalized nitronyl nitroxide biradical bridged one-dimensional lanthanide chains [Ln(tfa)3(NITPhImbis)]·CH2Cl2 (LnIII = Gd 1, Tb 2, Dy 3 and Nd 4; tfa = trifluoroacetylacetonate; NITPhImbis = 1-imidazole-3,5-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1H-imidazol-2-yl)benzene) have been prepared and characterized. Single crystal X-ray diffraction analyses reveal that complexes 1–4 possess a one-dimensional chain structure in which each nitronyl nitroxide biradical acts as a bridging ligand to link two different lanthanide ions via one of the NO groups and the imidazole ring of the biradical ligand to form a one-dimensional chain with a ‘head-to-tail’ structural motif. DC magnetic studies show that the magnetic interaction between the Gd atom and the coordinated NO group is ferromagnetic while the intramolecular magnetic coupling between two monoradicals is antiferromagnetic. Moreover, the spin dynamics indicates the presence of slow magnetic relaxation for Tb and Dy analogues, which could be attributed to the Dy/Tb-bis(nitronyl nitroxide) moieties. Thus, complexes Tb and Dy behave like chains of single-molecule magnets (SMMs).

Graphical abstract: Functionalized nitronyl nitroxide biradical bridged one-dimensional lanthanide chains: slow magnetic relaxation in the Tb and Dy analogues

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Publication details

The article was received on 06 Jun 2017, accepted on 02 Aug 2017 and first published on 02 Aug 2017


Article type: Paper
DOI: 10.1039/C7NJ02006F
Citation: New J. Chem., 2017, Advance Article
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    Functionalized nitronyl nitroxide biradical bridged one-dimensional lanthanide chains: slow magnetic relaxation in the Tb and Dy analogues

    H. Li, J. Sun, M. Yang, Z. Sun, J. Xie, Y. Ma and L. Li, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ02006F

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