化学
空间组
结晶学
对映体
上部结构
硼
手性(物理)
晶体结构
群(周期表)
齐次空间
八面体
四面体
立体化学
X射线晶体学
对称性破坏
几何学
衍射
物理
量子力学
有机化学
手征对称破缺
Nambu–Jona Lasinio模型
热力学
数学
作者
Fenghua Ding,Kent J. Griffith,Weiguo Zhang,Shaoxin Cui,Chi Zhang,Yiran Wang,Kendall Kamp,Hongwei Yu,P. Shiv Halasyamani,Zhihua Yang,Shilie Pan,Kenneth R. Poeppelmeier
摘要
Noncentrosymmetric (NCS) structures are of particular interest owing to their symmetry-dependent physical properties, e.g., pyroelectricity, ferroelectricity, piezoelectricity, and nonlinear optical (NLO) behavior. Among them, chiral materials exhibit polarization rotation and host topological properties. Borates often contribute to NCS and chiral structures via their triangular [BO3] and tetrahedral [BO4] units and their numerous superstructure motifs. However, no chiral compound with the linear [BO2] unit has been reported to date. Herein, an NCS and chiral mixed-alkali-metal borate, NaRb6(B4O5(OH)4)3(BO2), with a linear BO2- unit in the structure was synthesized and characterized. The structure features a combination of three types of basic building units (BBUs), [BO2], [BO3], and [BO4] with sp-, sp2-, and sp3-hybridization of boron atoms, respectively. It crystallizes in the trigonal space group R32 (No. 155), one of the 65 Sohncke space groups. Two enantiomers of NaRb6(B4O5(OH)4)3(BO2) were found, and their crystallographic relationships are discussed. These results not only expand the small family of NCS structures with the rare linear BO2- unit but also prompt recognition to the fact that NLO materials have generally overlooked the existence of two enantiomers in achiral Sohncke space groups.
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