%0 DATA
%A Jing, Zhu
%A Changzheng, Wang
%A Fang, Luan
%A Tianqi, Liu
%A Pengfei, Yan
%A Guangming, Li
%D 2014
%T Local Coordination Geometry Perturbed β‑Diketone
Dysprosium Single-Ion Magnets
%U https://acs.figshare.com/articles/journal_contribution/Local_Coordination_Geometry_Perturbed_Diketone_Dysprosium_Single_Ion_Magnets/2259196
%R 10.1021/ic500501r.s001
%2 https://acs.figshare.com/ndownloader/files/3895189
%K ligand
%K crystal structure analysis
%K SAP
%K D 4d symmetry exhibit
%K dysprosium complexes
%K SIM
%K relaxation
%K 3.
%K square antiprismatic geometry
%K diketone
%K Dy
%K D 2d symmetry
%K TFI
%X A series
of three β-diketone mononuclear dysprosium complexes, namely,
Dy(TFI)_{3}(H_{2}O)_{2} (**1**),
Dy(TFI)_{3}(bpy) (**2**), and [Dy(TFI)_{3}(Phen)]·0.02CHCl_{3} (**3**) (TFI = 2-(2,2,2-trifluoroethyl)-1-indone,
bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline) have been
designed and synthesized. Crystal structure analysis reveals that
complexes **1**–**3** have haveisomorphic
structures in which the central Dy(III) ion is eight-coordinated by
six oxygen atoms from three TFI ligands and two O/N atoms from auxiliary
ligands, forming a distorted bicapped trigonal prismatic geometry
for **1**, a distorted dodecahedral geometry for **2**, and a distorted square antiprismatic geometry for **3**, respectively. Magnetic studies indicate that complex **2** with *D*_{2d} symmetry and **3** with *D*_{4d} symmetry
exhibit slow magnetic relaxation with barrier heights (*U*_{eff}/*k*_{B}) of 48.8 K for **2** and 57.9 K for **3**. Strikingly, the relaxation
time (τ) of 0.0258 s for **3** is about 20 times that
for **2**, which is presumably associated with larger rotation
of the SAP surroundings for **3**. Further, complexes **2** and **3** exhibit essential magnetic hysteresis
loops at 1.8 K. These extend the recent reports of the single-ion
magnets (SIMs) of β-diketone mononuclear dysprosium complexes.