A Mononuclear Uranium(IV) Single-Molecule Magnet with an Azobenzene Radical Ligand
NAGIOS: RODERIC FUNCIONANDO

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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Antunes, Maria A.; Coutinho, Joana T.; Santos, Isabel C.; Marçalo, Joaquim; Almeida, Manuel; Baldoví, José J. Perfil; Pereira, Laura C. J.; Gaita Ariño, Alejandro Perfil; Coronado Miralles, Eugenio Perfil
This document is a artículoDate2015
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.

    Maria A. Antunes, Joana T. Coutinho, Isabel C. Santos, Joaquim Marçalo, Manuel Almeida, José J. Baldoví, Laura C. J. Pereira, Alejandro Gaita-Ariño, Eugenio Coronado, Chemistry: A European Journal, 2015, 21 (49) 17817-17826
https://doi.org/10.1002/chem.201503133

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