The relevance of polyoxometalates (POMs) in molecular magnetism is based on their ability to act as chelating ligands incorporating a large number of magnetic centers at specific sites of their molecular structures. Mononuclear single ion magnets offer very attractive possibilities to design new molecular nanomagnets with a control over their magnetic properties that is almost impossible to achieve with polynuclear clusters and dominant quantum effects.
F. Luis, CSIC-Universidad de Zaragoua, Spain, and colleagues report the magnetic study of a series of a robust and stable mononuclear lanthanoid-based complexes formulated as K12LnP5W30O110•nH2O (Ln3+ = Tb, Dy, Ho, Er, Tm, and Yb), which are usually called “Preyssler anions”. These have been characterized with static and dynamic magnetic measurements and heat capacity experiments.
The team found that POM-based mononuclear lanthanoid complexes with 5-fold symmetry can provide new examples of single-ion magnets that exhibit magnetic hysteresis at low temperatures in the case of Dy and Ho.
- Lanthanoid Single-Ion Magnets Based on Polyoxometalates with a 5‑fold Symmetry: The Series [LnP5W30O110]12− (Ln3+ = Tb, Dy, Ho, Er, Tm, and Yb),
S. Cardona-Serra, J. M. Clemente-Juan, E. Coronado, A. Gaita-Ariño, A. Camón, M. Evangelisti, F. Luis, M. J. Martínez-Pérez, J. Sesé,
J. Am. Chem. Soc. 2012.