Kong Fang, Jiang Hai-Long, Hu Ting, Mao Jiang-Gao
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China.
Inorg Chem. 2008 Nov 17;47(22):10611-7. doi: 10.1021/ic801292p. Epub 2008 Oct 18.
Two novel alkali(I) borogermanates with noncentrosymmetric structures, namely, CsB 3GeO 7 and K 2B 2Ge 3O 10, have been synthesized by high-temperature solid-state reactions in a platinum crucible. The structure of CsB 3GeO 7 features a novel three-dimensional (3D) framework composed of cyclic B 3O 7 (5-) groups that are interconnected by Ge(IV) cations, whereas the structure of K 2B 2Ge 3O 10 is a new 3D network based on cap-shaped [Ge 3B 2O 14] (10-) clusters that are interconnected via Ge-O-B bridges. CsB 3GeO 7 exhibits a second-harmonic generation (SHG) response that is about 1.5 times that of KDP (KH 2PO 4), whereas the SHG signal of K 2B 2Ge 3O 10 is very weak. Both compounds are insulators and transparent in the range of 300-5000 nm. The electronic structure calculations for both compounds also have been performed.
通过在铂坩埚中进行高温固态反应，合成了两种具有非中心对称结构的新型碱金属（I）硼锗酸盐，即CsB₃GeO₇和K₂B₂Ge₃O₁₀。CsB₃GeO₇的结构具有由环状B₃O₇⁽⁵⁻⁾基团组成的新型三维（3D）框架，这些基团通过Ge（IV）阳离子相互连接，而K₂B₂Ge₃O₁₀的结构是基于帽状[Ge₃B₂O₁₄]⁽¹⁰⁻⁾簇的新型3D网络，这些簇通过Ge - O - B桥相互连接。CsB₃GeO₇表现出的二次谐波产生（SHG）响应约为KDP（KH₂PO₄）的1.5倍，而K₂B₂Ge₃O₁₀的SHG信号非常弱。这两种化合物均为绝缘体，在300 - 5000 nm范围内是透明的。还对这两种化合物进行了电子结构计算。
