MIO3F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains
MIO3F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains
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MIO3F（M = Co 和 Ni）：具有锯齿链的磁性碘酸盐氟化物
DOI：
10.1021/acs.inorgchem.2c03167
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发表时间：
2022-10-26
影响因子：
4.6
通讯作者：
Lu，Hongcheng
中科院分区：
文献类型：
--
作者：
Liu，Hang;Wang，Yanhong;Lu，Hongcheng
碘酸阴离子基已广泛用于非线性光学材料等功能材料的设计和合成，但很少用于磁性材料的设计和合成。特别是，目前还没有关于磁性碘化物的报道。本文首先采用水热法合成了两种新型磁性碘酸氟化物MIO3F (M = co1和Ni2)，并通过磁化率、磁化率、热容测量、热重、傅里叶变换红外光谱（FT-IR）和紫外-可见-近红外光谱（UV-vis-NIR）对其进行了表征。化合物1和2是同结构的，在单斜空间群pp21 /n中结晶，沿轴方向交替有M2+ -F2-M2 + -O2-M2 +之字形自旋链，它们在平面上被三角形的io3基团进一步分开。在16.5 K时，1的磁化率显示出反铁磁长程序（LRO），热容结果证实了这一点，其释放的熵与Co2+在低温下的伪自旋1/2的理论值一致。与此同时，2在10.5 K左右显示出低维磁性的宽最大值，然后在5.7 K处出现一个尖峰，表明LRO转变的发生，与热容测量结果吻合得很好。场相关磁化在4.5 T左右表现出明显的自旋翻转跃迁，在4.5 ~ 7 T之间表现出磁滞回线，但在2.3 T左右只能观察到轻微的斜率变化。还报道了1和2的热稳定性、FT-IR和UV-vis-NIR光谱。
The iodate anion group has been widely used for design and synthesis of functional materials including nonlinear optical materials but rarely for magnetic materials. Particularly, none of magnetic iodate fluorides has been reported yet. In this work, first, two novel magnetic iodate fluorides MIO3F (M = Co1and Ni2) have been synthesized by a hydrothermal method and characterized by magnetic susceptibility, magnetization, and heat capacity measurements as well as thermogravimetry, Fourier transform infrared spectroscopy (FT-IR), and ultraviolet–visible–near-infrared (UV–vis–NIR) spectroscopy. Compounds1and2are isostructural and crystallize in the monoclinic space groupP21/nwith alternating M2+–F2–M2+–O2–M2+zigzag spin chains along thebaxis, which are further separated by triangular IO3groups in theabplane. Magnetic susceptibilities suggest that1exhibits an antiferromagnetic long-range order (LRO) at 16.5 K, confirmed by heat capacity results with released entropy consistent with the theoretical value for a pseudo-spin of 1/2 for Co2+at low temperatures. Meanwhile,2displays a broad maximum around 10.5 K for low dimensional magnetism followed by a sharp peak at 5.7 K indicating the occurrence of an LRO transition, in good agreement with the heat capacity measurement. Field-dependent magnetizations show an obvious spin-flop transition around 4.5 T and a magnetic hysteresis loop between 4.5 and 7 T for1, but only a slight slope change could be observed around 2.3 T for2. Thermal stability, FT-IR, and UV–vis–NIR spectroscopy of1and2are also reported.