Zhao Yunqi, Song Yipeng, Li Yanqiang, Liu Wei, Zhou Yang, Huang Weiqi, Luo Junhua, Zhao Sangen, Ahmed Belal
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Inorg Chem. 2024 Jun 17;63(24):11187-11193. doi: 10.1021/acs.inorgchem.4c00938. Epub 2024 May 30.
Birefringence is an important linear optical property of anisotropic crystals that plays a significant role in regulating light polarization. A new bialkali-rare earth metal sulfate, NaRbY(SO) compound, consisting of non-π-conjugated alkali metals and rare earth metal-centered dodecahedral YO has been synthesized. The structure analysis suggests that the three-dimensional (3D) structure of the compound is found to be attributable to the combination of dodecahedral YO and tetrahedral SO groups with Na and Rb located in the cavities. The ultraviolet, visible, and near-infrared (UV-vis-NIR) spectra reveal that the compound exhibits transparency at a wavelength of less than 200 nm. The observed birefringence of the compound is 0.045@550 nm, which is comparatively larger than that of most deep-ultraviolet (DUV) birefringent crystals. The birefringence mainly originated from the YO dodecahedron, which is suggested by first-principles calculations. This research work can provide a useful perspective to explore new DUV sulfates with excellent birefringence.
双折射是各向异性晶体的一种重要线性光学性质，在调节光的偏振方面发挥着重要作用。一种由非π共轭碱金属和以稀土金属为中心的十二面体YO构成的新型双碱稀土金属硫酸盐NaRbY(SO)化合物已被合成。结构分析表明，该化合物的三维（3D）结构归因于十二面体YO和四面体SO基团的组合，其中Na和Rb位于空洞中。紫外、可见和近红外（UV-vis-NIR）光谱显示，该化合物在波长小于200 nm时表现出透明性。观察到该化合物在550 nm处的双折射为0.045，这比大多数深紫外（DUV）双折射晶体的双折射相对要大。第一性原理计算表明，双折射主要源于YO十二面体。这项研究工作可为探索具有优异双折射的新型DUV硫酸盐提供有益的视角。
