Interplay between structure and magnetism in the low-dimensional spin system: K(C8H16O4)2CuCl3·H2O

Interplay between structure and magnetism in the low-dimensional spin system: K(C8H16O4)2CuCl3·H2O
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低维自旋系统中结构与磁性的相互作用:K(C8H16O4)2CuCl3·H2O

DOI:
10.1039/c6ce02331b
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发表时间:
2017
期刊:
影响因子:
3.1
通讯作者:
C. Krellner
C. Krellner
中科院分区:
化学3区
文献类型:
--
作者:
N. van Well;M. Bolte;B. Delley;B. Wolf;M. Lang;J. Schefer;Ch. Rüegg;W. Assmus;C. Krellner

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基于冠醚配合物与磁性离子,特别是Cu(II)的材料可以用于合成新的低维量子自旋系统。合成了新的冠醚配合物二-μ-氯-双(12-冠-4)-水合二氯-铜(II)-钾,K(C_8H_(16)O_4)_2CuCl_3·H_2O(1),测定了其结构,并分析了其磁性。配合物(1)为单斜晶系,空间群P21/n,晶胞参数a = 9.5976(5)B = 11.9814(9),c = 21.8713(11),β = 100.945(4)°。在1.8-300 K温度范围内研究了该化合物的磁性。磁化率在23 K时出现极大值,但在1.8K以下没有三维长程磁序。S = 1/2的Cu(II)离子形成反铁磁耦合二聚体,Cu-Cl距离为2.2554(8)和4.683(6),Cu-Cl-Cu角为115.12(2)°,2 J二聚体= −2.96 meV(−23.78 cm−1)。分析了H_2O对Cl-Cu-Cl交换路径的影响。我们的结果表明,考虑到H2O分子的桥接相互作用的单重态-三重态分裂的值增加。这是支持密度泛函理论(DFT)计算的耦合常数与Perdew和王(PWC),和Perdew,伯克和Ernzerhof(PBE)和强约束和适当规范(SCAN)交换相关函数的研究化合物显示出良好的协议。
Materials based on a crown ether complex together with magnetic ions, especially Cu(II), can be used to synthesize new low dimensional quantum spin systems. We have prepared the new crown ether complex di-μ-chloro-bis(12-crown-4)-aquadichloro-copper(II)-potassium, K(C8H16O4)2CuCl3·H2O (1), determined its structure, and analyzed its magnetic properties. Complex (1) has a monoclinic structure and crystallizes in the space group P21/n with lattice parameters of a = 9.5976(5) Å, b = 11.9814(9) Å, c = 21.8713(11) Å and β = 100.945(4)°. The magnetic properties of this compound have been investigated in the temperature range 1.8–300 K. The magnetic susceptibility shows a maximum at 23 K, but no 3-D long range magnetic order down to 1.8 K. The S = 1/2 Cu(II) ions form antiferromagnetically coupled dimers with Cu–Cl distances of 2.2554(8) Å and 4.683(6) Å, and a Cu–Cl–Cu angle of 115.12(2)° with 2Jdimer = −2.96 meV (−23.78 cm−1). The influence of H2O on the Cl–Cu–Cl exchange path is analyzed. Our results show that the values of the singlet–triplet splitting are increasing considering H2O molecules in the bridging interaction. This is supported by density functional theory (DFT) calculations of coupling constants with Perdew and Wang (PWC), and Perdew, Burke and Ernzerhof (PBE) and the strongly constrained and appropriately normed (SCAN) exchange-correlation function show excellent agreement for the studied compound.
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