State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People's Republic of China.
Inorg Chem. 2011 Mar 7;50(5):1973-82. doi: 10.1021/ic102451n. Epub 2011 Jan 13.
Three novel rubidium borogermanates with three types of noncentrosymmetric structures, namely, RbGeB(3)O(7), Rb(2)GeB(4)O(9), and Rb(4)Ge(3)B(6)O(17), have been synthesized by high-temperature solid-state reactions in platinum crucibles. The structure of RbGeB(3)O(7) features a three-dimensional (3D) anionic framework composed of cyclic B(3)O(7) groups corner-sharing GeO(4) tetrahedra. The structure of Rb(2)GeB(4)O(9) shows a 3D anionic framework based on B(4)O(9) clusters connected by GeO(4) tetrahedra via corner sharing. The structure of Rb(4)Ge(3)B(6)O(17) is a novel 3D anionic framework composed of cyclic B(3)O(8) groups, Ge(2)O(7) dimers, and GeO(4) tetrahedra that are interconnected via corner sharing. Second harmonic generation (SHG) measurements indicate that RbGeB(3)O(7), Rb(2)GeB(4)O(9), and Rb(4)Ge(3)B(6)O(17) display moderate SHG responses that are approximately 1.3, 2.0, and 1.3 × KH(2)PO(4) (KDP), respectively, which are slightly smaller than those from theoretical calculations (about 3.7, 2.8, and 2.4 × KDP, respectively).
三种新型的含铷锗硼酸盐，具有三种非中心对称结构，即 RbGeB(3)O(7)、Rb(2)GeB(4)O(9)和 Rb(4)Ge(3)B(6)O(17)，是通过在铂坩埚中的高温固相反应合成的。RbGeB(3)O(7)的结构具有由循环 B(3)O(7)基团共享角连接的 GeO(4)四面体组成的三维(3D)阴离子骨架。Rb(2)GeB(4)O(9)的结构显示了基于 B(4)O(9)簇的 3D 阴离子骨架，通过共享角连接 GeO(4)四面体。Rb(4)Ge(3)B(6)O(17)的结构是一种由共享角连接的循环 B(3)O(8)基团、Ge(2)O(7)二聚体和 GeO(4)四面体组成的新型 3D 阴离子骨架。二次谐波产生(SHG)测量表明，RbGeB(3)O(7)、Rb(2)GeB(4)O(9)和 Rb(4)Ge(3)B(6)O(17)显示出中等的 SHG 响应，分别约为 1.3、2.0 和 1.3×KH(2)PO(4)(KDP)，略小于理论计算值(分别约为 3.7、2.8 和 2.4×KDP)。
