Two mixed alkali-metal borates, K_0.5Li[B₆O₁₀]·0.5H₃O (1) and [(μ₅-OH)@(Na₄Li)]_0.5[B₆O₁₀]·0.5B(OH)₃ (2), have been prepared under solvothermal conditions. Both of them are obtained in the same synthetic system and contain a B₆O₁₃^8– cluster as the structural-building unit (SBU) but exhibit quite different structural features. 1 is a centric three-dimensional (3D) oxoboron (B–O) framework, where templated mixed K⁺ and Li⁺ cations occupied the cavities of the structure. 2 crystallizes in an acentric space group under the templating effect of a unique acentric alkali-metal cluster [(μ₅-OH)@(Na₄Li)]⁴⁺. The SBU of 2 is also the B₆O₁₃^8– cluster, which acts as six-connected nodes linked together to form a 3D B–O framework, showing different characters from 1 because of two types of templates; the acentric [(μ₅-OH)@(Na₄Li)]⁴⁺ clusters and the electroneutral B (OH)₃ groups fill in two different cages in the framework and further connect each other via Na–O–B bonds to build a novel two-dimensional (2D) wavy bricklike network, resulting in a 3D B–O framework interpenetrated by a 2D [(μ₅-OH)@(Na₄Li)]–B(OH)₃ network. As a crystal material with an acentric space group, 2 shows a good second harmonic generation response of about 2.8 times that of KDP (KH₂PO₄) and has a cutoff edge below 190 nm, which suggests that 2 is a potential deep-UV NLO material.

中文翻译：

---

从阳离子到簇的两种混合碱金属硼酸盐

两种混合碱金属硼酸盐，K _0.5 Li[B ₆ O ₁₀ ]·0.5H ₃ O ( 1 ) 和 [(μ ₅ -OH)@(Na ₄ Li)] _0.5 [B ₆ O ₁₀ ]·0.5B( OH) ₃ ( 2 ) 在溶剂热条件下制备。它们都是在同一个合成系统中获得的，并且包含一个 B ₆ O ₁₃ ^8-簇作为结构构建单元 (SBU)，但表现出完全不同的结构特征。图1是一个中心三维 (3D) 氧硼 (B-O) 框架，其中模板化混合 K ⁺和Li ⁺阳离子占据结构的空腔。2在独特的无心碱金属簇[(μ ₅ -OH)@(Na ₄ Li)] ⁴⁺的模板效应下在无心空间群中结晶。2的SBU也是B ₆ O ₁₃ ^8-簇，作为6个连接的节点连接在一起形成一个3D B-O框架，由于两种模板而显示出与1不同的字符；无着丝粒[(μ ₅ -OH)@(Na ₄ Li)] ⁴⁺簇和电中性B (OH) ₃基团在框架中填充两个不同的笼子，并通过 Na-O-B 键进一步相互连接，以构建新的二维（2D）波浪砖状网络，从而形成由 2D [（μ ₅ -OH)@(Na ₄ Li)]-B(OH) ₃网络。作为具有非中心空间群的晶体材料，2表现出良好的二次谐波产生响应，约为 KDP (KH ₂ PO ₄ ) 的 2.8 倍，并且在 190 nm 以下具有截止边缘，这表明2是潜在的深紫外NLO 材料。