两种新型自旋链化合物CaNi(HSeO)(SeO)和NaCu(SeO)·2HO的合成、结构及磁性质
Synthesis, structure and magnetic properties of two new spin-chain compounds CaNi(HSeO)(SeO) and NaCu(SeO)·2HO.
作者信息
Huang Xing, Zhao Zhiying, Wang Yanqi, Zhang Mengsi, He Zhangzhen
机构信息
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
出版信息
Dalton Trans. 2021 Dec 7;50(47):17716-17722. doi: 10.1039/d1dt03058b.
Two new selenite compounds CaNi(HSeO)(SeO) (CaNi) and NaCu(SeO)·2HO (NaCu) were obtained by a hydrothermal method. Both compounds crystallize in the triclinic system of space group 1̄, featuring a selenite-bridged one-dimensional (1D) spin-chain structure running along the -axis. Magnetic measurements indicate that CaNi undergoes a long-range antiferromagnetic order (LRO) at = ∼3.8 K, while NaCu does not exhibit a LRO down to 2 K but the onset of a short-range correlation at = ∼30 K. The intrachain exchange coupling / = -2.59 K for CaNi and / = -47.13 K for NaCu can be estimated by a fit using the 1D spin-chain model. The thermogravimetric analyses show that both compounds are stable below 130 °C. The UV-vis diffuse reflectance spectra indicate that the band gaps of CaNi and NaCu are 4.38 eV and 3.18 eV, respectively.
通过水热法获得了两种新型亚硒酸盐化合物CaNi(HSeO)(SeO)（CaNi）和NaCu(SeO)·2HO（NaCu）。两种化合物均结晶于空间群为1̄的三斜晶系，具有沿z轴延伸的亚硒酸盐桥连一维（1D）自旋链结构。磁性测量表明，CaNi在T = ∼3.8 K时经历长程反铁磁有序（LRO），而NaCu在低至2 K时未表现出LRO，但在T = ∼30 K时开始出现短程关联。通过使用1D自旋链模型拟合，可以估计CaNi的链内交换耦合J/kB = -2.59 K，NaCu的J/kB = -47.13 K。热重分析表明，两种化合物在130°C以下均稳定。紫外可见漫反射光谱表明，CaNi和NaCu的带隙分别为4.38 eV和3.18 eV。
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