A series of 1D Dy(III) compound showing slow magnetic relaxation: synthesis, structure, and magnetic studies.
A series of 1D Dy(III) compound showing slow magnetic relaxation: synthesis, structure, and magnetic studies.
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DOI：
10.1039/c2dt12313d
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发表时间：
2012-05
影响因子：
4
通讯作者：
Yan Zhu;F. Luo;Yu-mei Song;Hai-xiao Huang;Gong-ming Sun;Xiao-zhao Tian;Zi-Zun Yuan;Zhen-wei Liao;M. Luo;Shu-juan Liu;Wen-yuan Xu;Xue-feng Feng
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文献类型：
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作者：
Yan Zhu;F. Luo;Yu-mei Song;Hai-xiao Huang;Gong-ming Sun;Xiao-zhao Tian;Zi-Zun Yuan;Zhen-wei Liao;M. Luo;Shu-juan Liu;Wen-yuan Xu;Xue-feng Feng
在这项工作中，我们详细地介绍了三个一维同自旋Dy(III)化合物的合成、结构和磁性研究。对于1，含有一个与晶体学无关的Dy(III)位，配位环境为扭曲的正反棱柱几何构型。在2的范围内，观察到了四个与晶体学无关的Dy(III)晶位，它们的几何构型发生了很大的扭曲。对于3，涉及两个与晶体无关的Dy(III)位，显示出双凸起的三棱柱构型。磁性研究表明，1为弱铁磁相互作用，2和3为弱反铁磁相互作用。用交流磁化率测量方法研究了它们的动态磁性质，揭示了它们的缓慢磁弛豫。此外，在1中观察到了场相关的交流信号，当施加静态DC=1000Oe场时，可以清楚地发现强的频率相关的交流信号和异相的峰值(χ‘’)。最后，通过对Arrhenius定律的拟合，估算了能垒和驰豫时间。
In this work, we present the synthesis, structure, and magnetic studies of three 1D homo-spin Dy(III) compounds in detail. For 1, one crystallography-independent Dy(III) site is contained and the coordination surrounding is a distorted square-antiprism geometry. Within 2, four crystallography-independent Dy(III) sites with largely distorted square-antiprism geometry are observed. As for 3, two crystallography-independent Dy(III) sites showing bicapped triangular-prism geometry are involved. The magnetic studies suggest weak ferromagnetic interactions for 1 and weak antiferromagnetic interactions for 2 and 3. Their dynamic magnetic properties are investigated by means of alternating current (ac) susceptibility measurement, revealing their slow magnetic relaxation. Moreover, a field-dependent ac signal is observed in 1, when by applying a static dc = 1000 Oe field, strong frequency-dependent ac signals and the peak of out-of-phase (χ'') can be clearly found. Ultimately, by fitting the Arrhenius law the energy barrier and relaxation time are estimated.