title: [U(Tp(Me2))2(bipy)]+: a cationic uranium(III) complex with single-molecule-magnet behavior.
abstract: The addition of 2,2'-bipyridine to [U(Tp(Me2))(2)I] (1) results in the displacement of the iodide and the formation of the cationic uranium(III) complex [U(Tp(Me2))(2)(bipy)]I (2). This compound was isolated as a dark-green solid in good yield and characterized by IR and NMR spectroscopies, and its molecular structure was determined by single-crystal X-ray diffraction. Studies of its magnetic properties revealed a frequency dependence of magnetization with a blocking temperature of 4.5 K and, at lower temperatures, a slow relaxation of magnetization with an energy barrier of 18.2 cm(-1), characteristic of single-molecule-magnet behavior.
authors.affiliation: Unidade de Ciências Químicas e Radiofarmacêuticas, Instituto Tecnológico e Nuclear/CFMCUL, P-2686-953 Sacavém, Portugal.
authors.forename: Maria A
authors.initials: MA
authors.lastname: Antunes
authors.forename: Laura C J
authors.initials: LC
authors.lastname: Pereira
authors.forename: Isabel C
authors.initials: IC
authors.lastname: Santos
authors.forename: Marinella
authors.initials: M
authors.lastname: Mazzanti
authors.forename: Joaquim
authors.initials: J
authors.lastname: Marçalo
authors.forename: Manuel
authors.initials: M
authors.lastname: Almeida