Rational Design of a Lanthanide‐Based Complex Featuring Different Single‐Molecule Magnets |
| |
Authors: | Dr F Pointillart T Guizouarn B Lefeuvre Dr S Golhen Dr O Cador Dr L Ouahab |
| |
Institution: | Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS, Université de Rennes 1, 263 Avenue du Général Leclerc, 35042 Rennes CEDEX (France) |
| |
Abstract: | The rational synthesis of the 2‐{1‐methylpyridine‐N‐oxide‐4,5‐4,5‐bis(propylthio)tetrathiafulvalenyl]‐1H‐benzimidazol‐2‐yl}pyridine ligand ( L ) is described. It led to the tetranuclear complex Dy4(tta)12( L )2] ( Dy‐Dy2‐Dy ) after coordination reaction with the precursor Dy(tta)3?2 H2O (tta?=2‐thenoyltrifluoroacetonate). The X‐ray structure of Dy‐Dy2‐Dy can be described as two terminal mononuclear units bridged by a central antiferromagnetically coupled dinuclear complex. The terminal N2O6 and central O8 environments are described as distorted square antiprisms. The ac magnetism measurements revealed a strong out‐of‐phase signal of the magnetic susceptibility with two distinct sets of data. The high‐ and low‐frequency components were attributed to the two terminal mononuclear single‐molecule magnets (SMMs) and the central dinuclear SMM, respectively. A magnetic hysteresis loop was detected at very low temperature. From both structural and magnetic points of view, the tetranuclear SMM Dy‐Dy2‐Dy is a self‐assembly of two known mononuclear SMMs bridged by a known dinuclear SMM. |
| |
Keywords: | lanthanides ligand design magnetic properties single‐molecule magnets |
|
|