Journal article

Heterometallic 3d-4f Single-Molecule Magnets: Ligand and Metal Ion Influences on the Magnetic Relaxation

Stuart K Langley, Crystal Le, Liviu Ungur, Boujemaa Moubaraki, Brendan F Abrahams, Liviu F Chibotaru, Keith S Murray



Six tetranuclear 3d–4f single-molecule magnet (SMM) complexes formed using N-n-butyldiethanolamine and N-methyldiethanolamine in conjunction with ortho- and para-substituted benzoic acid and hexafluoroacetoacetone ligands yield two families, both having a butterfly metallic core. The first consists of four complexes of type {Co2(III)Dy2(III)} and {Co2(III)Co(II)Dy(III)} using N-n-butyldiethanolamine with variation of the carboxylate ligand. The anisotropy barriers are 80 cm–1, (77 and 96 cm–1—two relaxation processes occur), 117 and 88 cm–1, respectively, each following a relaxation mechanism from a single DyIII ion. The second family consists of a {Co2(III)Dy2(III)} and a {Cr2(III)Dy2(III)}..

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University of Melbourne Researchers


Funding Acknowledgements

K.S.M thanks the Australian Research Council (ARC) and the Australia-India Strategic Research Fund (AISRF) for support of this work. L.U. and L.C. acknowledge the support of the Flemish Science Foundation (FWO) and of INPAC and Methusalem programs of the Univ. of Leuven. Part of this research was undertaken on the MX1 beamline at the Australian Synchrotron, Clayton, Victoria, Australia. Dr. W. Phonsri is thanked for assistance with graphics.