Tuning of magnetic frustration in S=1/2 Kagome lattices {[Cu3(CO3)2(bPe)3](CLO4)2}n and {[Cu3(CO3)2(bPY)3](CLO4)2}n through rigid and flexible ligands
Tuning of magnetic frustration in S=1/2 Kagome lattices {[Cu3(CO3)2(bPe)3](CLO4)2}n and {[Cu3(CO3)2(bPY)3](CLO4)2}n through rigid and flexible ligands
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DOI：
10.1016/j.ssc.2015.01.018
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发表时间：
2015-04-01
影响因子：
2.1
通讯作者：
Nath, R.
中科院分区：
文献类型：
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作者：
Ajeesh, M. O.;Yogi, A.;Nath, R.
合成了S=1/2 Kagome晶格{[Cu3(CO3)(2)(Bpe)(3)](ClO4)(2)}(N)和{[Cu3(CO3)(2)(Bpe)(3)](ClO4)(2)}(N)的单晶和多晶样品。通过X射线衍射和磁化强度测量等手段对其结构和磁性进行了表征。这两种化合物均为六方结构(空间群P-6)，在ab面上由CuO4 Kagome层组成，但通过刚性的bpy或柔性的bpe配体沿c方向连接形成三维骨架。磁性测量表明，这两个化合物在低温下都经历了铁磁有序(T-c)，并且可以通过改变柱状配体的性质来调节T_c和受挫程度。由柔性BPE配体组成的{[Cu3(CO3)(2)(BPE)(3)](ClO4)(2)}(N)具有5.7K的Tc值和-39.7K的居里-魏斯温度(theta(Cw))，从而产生类似或等于6.96的受挫参数|theta(Cw)|/Tc。但是，用更刚性和电子离域的BPY配体取代BPE会导致增强的T_c接近或等于9.3K，而受挫参数|theta(CW)|/T_c接近或等于3.54。(C)2015爱思唯尔有限公司。保留所有权利。
Single crystalline and polycrystalline samples of S = 1/2 Kagome lattices {[Cu-3(CO3)(2)(bpe)(3)](CLO4)(2)}(n) and {[Cu-3(CO3)(2)(bpe)(3)](CLO4)(2)}(n), respectively were synthesized. Their structural and magnetic properties were characterized by means of x-ray diffraction and magnetization measurements. Both compounds crystalize in a hexagonal structure (space group P-6) consisting of CuO4 Kagome layers in the ab-plane but linked along c direction through either rigid bpy or flexible bpe ligands to form 3D frame works. Magnetic measurements reveal that both the compounds undergo ferromagnetic ordering (T-c) at low temperatures and the Tc and the extent of frustration could be tuned by changing the nature of the pillar ligands. {[Cu-3(CO3)(2)(bpe)(3)](CLO4)(2)}(n) which is made up of flexible bpe ligands has a Tc of 5.7 K and a Curie-Weiss temperature (theta(cw)) of -39.7 K giving rise to a frustration parameter of | theta(cw) | / Tc similar or equal to 6.96. But the replacement of bpe by a more rigid and electronically delocalized bpy ligand leads to an enhanced Tc similar or equal to 9.3 K and a reduced frustration parameter of | theta(cw) | / Tc similar or equal to 3.54. (C) 2015 Elsevier Ltd. All rights reserved.