Title
A pair of mononuclear Dy(III) enantiomers showing single-ion magnet and ferroelectric properties
Author
Xi-Li Li, Cancan Zhu, Qixiang Rong, Jiahao Wei, Ruixue Li, Cai-Ming Liu
Year
2018
Journal
New Journal of Chemistry
Abstract
Using enantiopure ligands (–)/(+)-4,5-pinene-2,2ʹ-bipyridine (LR/LS) to react with Dy(btfa)3•2H2O, respectively, a pair of Dy(III) enantiomers with the formulae Dy(btfa)3LR (R-1 ) and Dy(btfa)3LS (S-1, btfa– = 3-benzoly-1,1,1-trifluoroacetonate) were obtained and structurally characterized. Each Dy(III) ion in R-1 and S-1 is octa-coordinate and adopts approximately square-antiprismatic (SAP) geometry with D4d symmetry. The studies on the magnetic and ferroelectric properties of R-1 were carried out and the investigation result of the magnetic property revealed that it displays slow magnetic relaxation behavior under zero direct-current (dc) field, confirming its single-ion magnet (SIM) characteristic with the effective energy barrier of 95.4(1.5) K. Moreover, R-1 crystallizes in ferroelectric point group C1, and exhibits ferroelectricity with notable remnant polarization (Pr) value of 3.75 μC/cm2 at room temperature. All these research results also suggested that R-1 and S-1 are potential multifunctional molecule-based materials combining chiroptical activities, ferroelectric and SIM properties within one molecule.
Instrument
J-810
Keywords
Circular dichroism, Stereochemistry, Solid state, Cotton effect, Inorganic chemistry