title: A uranium-based UO2(+)-Mn2+ single-chain magnet assembled trough cation-cation interactions.
abstract: Single-chain magnets (SCMs) are materials composed of magnetically isolated one-dimensional (1D) units exhibiting slow relaxation of magnetization. The occurrence of SCM behavior requires the fulfillment of stringent conditions for exchange and anisotropy interactions. Herein, we report the synthesis, the structure, and the magnetic characterization of the first actinide-containing SCM. The 5f-3d heterometallic 1D chains [{[UO2(salen)(py)][M(py)4](NO3)}]n, (M=Cd (1) and M=Mn (2); py=pyridine) are assembled trough cation-cation interaction from the reaction of the uranyl(V) complex [UO2(salen)py][Cp*2Co] (Cp*=pentamethylcyclopentadienyl) with Cd(NO3)2 or Mn(NO3)2 in pyridine. The infinite UMn chain displays a high relaxation barrier of 134±0.8 K (93±0.5 cm(-1)), probably as a result of strong intra-chain magnetic interactions combined with the high Ising anisotropy of the uranyl(V) dioxo group. It also exhibits an open magnetic hysteresis loop at T<6 K, with an impressive coercive field of 3.4 T at 2 K.
authors: Laboratoire de Reconnaissance Ionique et Chimie de Coordination SCIB, UMR-E3 CEA-UJF, INAC, CEA-Grenoble, 17 rue des Martyrs, 38054 Grenoble Cedex 09 (France) http://inac.cea.fr/Pisp/51/marinella.mazzanti.html.
authors: Victor
authors: V
authors: Mougel
authors: Lucile
authors: L
authors: Chatelain
authors: Johannes
authors: J
authors: Hermle
authors: Roberto
authors: R
authors: Caciuffo
authors: Eric
authors: E
authors: Colineau
authors: Floriana
authors: F
authors: Tuna
authors: Nicola
authors: N
authors: Magnani
authors: Arnaud
authors: A
authors: de Geyer
authors: Jacques
authors: J
authors: Pécaut
authors: Marinella
authors: M
authors: Mazzanti
keywords: actinides; cations; polymetallic complexes; single-chain magnets; uranium