Single molecule magnet behaviour in a {Dy₄P₂} octahedron

Abstract

Two new tetrametallic lanthanide-phosphonate complexes have been structurally and magnetically characterised. The {Dy4} complex is a single molecule magnet.

Tuning slow magnetic relaxation behaviour in a {Dy2}-based one-dimensional chain via crystal field perturbation

“…S5 †). 28,29 Meanwhile, the nonsuperposition of the M vs. H/T plots for 1 and 2 at different temperatures in the high eld further implies that the above mentioned behavior is probably due to the crystal-eld-induced splitting of the Stark level, signicant magnetic anisotropy and/ or low-lying energy states. [30][31][32] In order to investigate the dynamic magnetic properties of compounds 1 and 2, variable frequency alternating current (ac) magnetic susceptibilities were rstly performed with 3 Oe alternating eld and 0 Oe direct current (dc) eld at 2 K. No peaks are observed in the in-phase (c 0 ) vs. v and out-of-phase (c 00 ) vs. v curves for 1 and 2, which may be attributed to the presence of quantum tunneling of magnetization (QTM).…”

Synthesis, Crystal Structures, and Magnetic Properties of Lanthanide (III) Amino-Phosphonate Complexes

“…Previous studies have shown that the phosphonate moiety is an efficient functional group for the construction of molecular cages [38,39]. Winpenny and co-workers reported results using t-butylphosphonic acid (H2O3P t Bu) reacted with lanthanide salts Ln(NO3)3·nH2O or lanthanide pivalates (Ln = Gd(III), Tb(III), Dy(III), Ho(III), and Er(III) [12,13,39]. Winpenny and coworkers have also synthesized a decanuclear 3d-4f phosphonate cage of [Co4Ln10(O2C t Bu)12(O3PC6H10NH2)8(PO4)2(O2CMe)2(O3PC6H10NH3)2] (Ln = Gd, Dy) [38].…”

“…4f-phosphonate molecular cages have been studied because of the magnetic anisotropies of the lanthanide ions and the weak coupling between the metal ions can produce interesting properties [12]. When the isotropic Gd(III) metal ion is present, lanthanide phosphonate clusters display impressive magnetocaloric effects (MCE), which have been suggested for application in magnetic refrigeration [13].…”

“…The first lanthanide aminophosphonate, Lu(HO3PCH2CH2NH3)3(ClO4)3·3D2O was reported by Legendziwicz et al in 1999 [40,41]. Due to 4f-phosphonate low solubility in water and other organic solvents as well as their poor crystallinity, it is still a difficult task to obtain single crystals suitable for X-ray structural analysis [12,13]. These problems can be solved by two methods: (1) introducing polar functional groups into the ligand, such as hydroxy, amino, carboxylate, or crown ether [42][43][44][45]; and (2) introducing a second ligand such as pivalic acid or oxalic acid [41,42].…”

Single molecule magnet behavior observed in a 1-D dysprosium chain with quasi-D5h symmetry

“…Also, the arrangement of magnetic axes could be related to the dynamic magnetic behavior in both the compounds. 31 This result emphasizes that one needs to consider more on the negative charges of the coordination atoms for the rational design of lanthanide SMMs in a specific symmetry.…”