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Chiral and kryptoracemic Dy(iii) complexes with field-induced single molecule magnet behavior†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-07-11 00:00:00 , DOI: 10.1039/c8ce01052h
Ying-Ying Zhang 1, 2, 3, 4, 5 , Jing-Tao Yu 1, 2, 3, 4, 5 , Bo Li 5, 6, 7, 8 , De-Jing Li 5, 9, 10, 11 , Zhi-Gang Gu 5, 9, 10, 11 , Xiao-Fan Sun 12, 13, 14, 15, 16 , Hong-Ling Cai 12, 13, 14, 15, 16 , George E. Kostakis 17, 18, 19, 20, 21 , Guo Peng 1, 2, 3, 4, 5
Affiliation  

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 structures 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 the 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.

中文翻译:

手性和rypto外消旋的Dy(iii)配合物,具有磁场诱导的单分子磁体行为

合成了两种单核Dy(III)化合物,分别配制为[Dy(PNO)6(H 2 O)2 ] Br 31)和[Dy(PNO)6(NO 3)](ClO 422)和特点。单晶X射线衍射研究表明,当将不同的阴离子引入系统时会形成手性和and外消旋结构。1个结晶在所述非极性正交空间群P 2 1 2 1 2 1,而2在极地单斜空间群P 2 1中组装成k草酸酯。通过圆二色性(CD)研究证实了这两种化合物的单晶的光学活性。热重分析(TGA)显示,它们在376 K(1)和428 K(2)时稳定。差示扫描量热法(DSC)测量表明在研究的温度范围内不存在结构相变。磁性研究表明,这两种化合物都是场致单分子磁体(SMM),其势垒分别为1(36(±0.8)K )和2(32(±1.4)K)。此外,化合物2的介电和铁电特性 还进行了调查。
更新日期:2018-07-11
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