1. Chiral and kryptoracemic Dy(III) complexes with field-induced single molecule magnet behavior
- Author
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Bo Li, De-Jing Li, Ying-Ying Zhang, Jing-Tao Yu, Hong-Ling Cai, George E. Kostakis, Xiaofan Sun, Zhi-Gang Gu, and Guo Peng
- Subjects
Circular dichroism ,Materials science ,010405 organic chemistry ,General Chemistry ,Dielectric ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Crystallography ,Differential scanning calorimetry ,Molecule ,General Materials Science ,Orthorhombic crystal system ,Single-molecule magnet ,QD0146 ,Single crystal ,Monoclinic crystal system - Abstract
Two mononuclear Dy(III) compounds formulated as [Dy(PNO)6(H2O)2]Br3 (1) and [Dy(PNO)6(NO3)](ClO4)2 (2) have been synthesized and characterized. Single crystal X-ray diffraction studies show that chiral and kryptoracemic strcuctures are formed when different anions are introduced into the system. 1 crystallizes in the non-polar orthorhombic space group P212121, whereas 2 assembles as a kryptoracemate in the polar monoclinic space group P21. The optical activity of single crystals of these two compounds was confirmed by circular dichroism (CD) studies. Thermal gravimetric analyses (TGA) revealed that they are stable up to 376 K (1) and 428 K (2). Differential scanning calorimetry (DSC) measurements demonstrate the absence of structural phase transitions over the investigated temperature range. Magnetic studies show that both compounds are field-induced single molecule magnets (SMMs) with energy barriers of 36 (± 0.8) K for 1 and 32 (± 1.4) K for 2. Furthermore, the dielectric and ferroelectric properties of compound 2 were also investigated.
- Published
- 2018