Centrosymmetric (Hdima)₂[Ge₅B₃O₁₅(OH)] and Noncentrosymmetric Na₄Ga₃B₄O₁₂(OH): Solvothermal/Surfactant-Thermal Synthesis of Open-Framework Borogermanate and Galloborate

Under solvothermal/surfactant-thermal conditions, two new open-framework borogermanate and galloborate, centrosymmetric (Hdima)₂[Ge₅B₃O₁₅(OH)] (1; dima = dimethylamine) and noncentrosymmetric Na₄Ga₃B₄O₁₂(OH) (2), were obtained and characterized. Compound 1 contains an unusual basket-shaped Ge₅B₃O₁₈(OH) cluster and displays a 3D open-framework layered structure. Compound 2 shows an interrupted 3,4-connected network constructed by alternately linked BO₃ units and Ga³⁺ ions and displays weak second-harmonic-generation response.