School of Materials Science and Engineering, Henan Normal University, Xinxiang 453007, P. R. China.
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
Inorg Chem. 2023 May 22;62(20):7611-7616. doi: 10.1021/acs.inorgchem.3c00802. Epub 2023 May 11.
The design of giant birefringence was performed by adjusting cations to make parallel and compact alignments of π-conjugated (HCNS), where = 1 and 2) groups with large polarizability anisotropy. Finally, the first mixed alkali/alkali-earth-metal trithiocyanurates, AB(HCNS)·HO (A = K, Rb, Cs; B = Mg, Sr; = 5-8, 12), were designed and synthesized successfully. Importantly, CsMg(HCNS)·8HO () and KSr(HCNS)·5HO () possess large birefringences of 0.580 and 0.194 at 800 nm, respectively, of has the largest birefringence among all practical birefringent crystals, cyanurates, and hydroisocyanurates.
通过调节阳离子来实现巨大双折射的设计，使具有大各向异性极化率的π共轭（HCNS），其中 = 1 和 2）基团平行且紧密排列。最后，成功设计并合成了第一个混合碱/碱土金属三硫氰酸盐，AB（HCNS）·HO（A = K、Rb、Cs；B = Mg、Sr； = 5-8、12）。重要的是，CsMg（HCNS）·8HO（）和 KSr（HCNS）·5HO（）在 800nm 处分别具有 0.580 和 0.194 的大双折射，其中的双折射最大，在所有实用的双折射晶体、氰尿酸盐和异氰尿酸盐中也是最大的。
