Further Examples of the P‐O‐P Connection in Borophosphates: Synthesis and Characterization of Li2Cs2B2P4O15, LiK2BP2O8, and Li3M2BP4O14 (M=K,Rb)

A new series of anhydrous mixed alkali‐metal borophosphates—Li₂Cs₂B₂P₄O₁₅ ( 1 ), LiK₂BP₂O₈ ( 2 ), Li₃K₂BP₄O₁₄ ( 3 ), and Li₃Rb₂BP₄O₁₄ ( 4 )—have been successfully synthesized by using the conventional solid‐state reaction method. Compound 1 contains a novel fundamental building unit (FBU), [B₄P₈O₃₀], with B/P=1:2. Compound 2 contains an FBU of [B₂P₄O₁₆] with B/P=1:2. Compounds 3 and 4 are isotypic, and they have a [B(P₂O₇)₂] unit as their FBU. In all four compounds, their FBUs are connected through corner sharing to generate layered anionic partial structures, and then further linked with metallic polyhedra to form three‐dimensional (3D) frameworks. Most interestingly, three of the four compounds contain direct P‐O‐P connections in their structures, which is extremely rare among borophosphates. Thermal analyses, IR spectroscopy, and UV/Vis/near‐IR diffuse reflectance spectroscopy have also been performed on the four title compounds.     

Na1.89Ag0.11[BP2O7(OH)] und Na2[BP2O7(OH)] – Isotype Borophosphate mit Tetraeder-Schichtpaketen

Na_1.89Ag_0.11[BP₂O₇(OH)] and Na₂[BP₂O₇(OH)] – Isotypic Borophosphates Containing Layered Tetrahedral Blocks The isotypic borophosphates Na_1.89Ag_0.11[BP₂O₇(OH)] and Na₂[BP₂O₇(OH)] were grown under mild hydrothermal conditions (T = 165–170 °C). The crystal structures were solved by single crystal methods in the case of Na_1.89Ag_0.11[BP₂O₇(OH)] and by refinement of powder data (Rietveld method) for Na₂[BP₂O₇(OH)], respectively (orthorhombic, Pna2₁ (No. 33); a = 683.98(14)/682.36(1) pm, b = 2086.5(4)/2079.11(4) pm, c = 1318.9(3)/1314.46(3) pm; Z = 12). The compounds contain a complex two-dimensional structure consisting of layered tetrahedral blocks, which are formed by six- and eight-membered rings of tetrahedra. The Na⁺/Ag⁺-ions are located inside and near the surface of the ‘layer blocks' and are five-, six- and sevenfold coordinated by oxygen.     

常温常压下硼磷酸盐的直接合成与形成过程研究

在常温常压条件下直接合成了硼磷酸盐NaCd(H₂O)₂[BP₂O₈]·0.8H₂O(Hexagonal，P6₁22，a=0.971 30(14) nm，c=1.613 6(3) nm，V=1.318 36(40) nm³，Z=6)和NaZn(H₂O)_2<