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A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand
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A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand
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| M.A. Antunes; J.T. Coutinho; I.C. Santos; J. Marçalo; L.C.J. Pereira; M. Almeida; J.J. Baldoví; E. Coronado; A. Gaita-Ariño | |||
| Aquest document és un/a article, creat/da en: 2015 | |||
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| A tetravalent uranium compound with a radical azobenzene ligand, namely, [{(SiMe2NPh)3‐tacn}UIV(η2‐N2Ph2.)] (2), was obtained by one‐electron reduction of azobenzene by the trivalent uranium compound [UIII{(SiMe2NPh)3‐tacn}] (1). Compound 2 was characterized by single‐crystal X‐ray diffraction and 1H NMR, IR, and UV/Vis/NIR spectroscopy. The magnetic properties of 2 and precursor 1 were studied by static magnetization and ac susceptibility measurements, which for the former revealed single‐molecule magnet behaviour for the first time in a mononuclear UIV compound, whereas trivalent uranium compound 1 does not exhibit slow relaxation of the magnetization at low temperatures. A first approximation to the magnetic behaviour of these compounds was attempted by combining an effective electrostatic model with a phenomenological approach using the full single‐ion Hamiltonian. | |||
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