title: Single-molecule-magnet behavior in mononuclear homoleptic tetrahedral uranium(III) complexes.
abstract: The magnetic properties of the two uranium coordination compounds, [K(18c6)][U(OSi(O(t)Bu)3)4] and [K(18c6)][U(N(SiMe3)2)4], both presenting the U(III) ion in similar pseudotetrahedral coordination environments but with different O- or N-donor ligands, have been measured. The static magnetic susceptibility measurements and density functional theory studies suggest the presence of different ligand fields in the two compounds. Alternating-current susceptibility studies conducted at frequencies ranging from 95 to 9995 Hz and at temperatures in the 1.7-10 K range revealed for both compounds slow magnetic relaxation already at zero static magnetic field with similar energy barriers U ∼24 K.
authors.affiliation: C2TN, Instituto Superior Técnico, Universidade de Lisboa/CFMCUL , Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal.
authors.forename: Laura C J
authors.initials: LC
authors.lastname: Pereira
authors.forename: Clément
authors.initials: C
authors.lastname: Camp
authors.forename: Joana T
authors.initials: JT
authors.lastname: Coutinho
authors.forename: Lucile
authors.initials: L
authors.lastname: Chatelain
authors.forename: Pascale
authors.initials: P
authors.lastname: Maldivi
authors.forename: Manuel
authors.initials: M
authors.lastname: Almeida
authors.forename: Marinella
authors.initials: M
authors.lastname: Mazzanti