✍ Scribed by Rüdiger Kniep; Holger Engelhardt
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Inhaltsu È bersicht. Unter milden hydrothermalen Bedingungen (T = 165±170 °C) wurden im System M 2 O/B 2 O 3 / P 2 O 5 /H 2 O (M = Na, Ag) die isotypen Verbindungen Na 1.89 Ag 0.11 [BP 2 O 7 (OH)] und Na 2 [BP 2 O 7 (OH)] dargestellt. Die Kristallstruktur (orthorhombisch; Pna2 1 , Nr. 33) wurde mit Einkristallmethoden (Substitutionsphase Na 1.89 Ag 0.11 ) bzw. mit Rietveld-Methoden (reine Na-Verbindung) bestimmt: 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. Die Anionenteilstruktur besteht aus Tetraeder-Schichtpaketen (Dicke ca. 900 pm), die Sechser-und Achter-Ringsysteme enthalten. Die Kationen (Na + , Ag + ) befinden sich innerhalb der Schichtpakete bzw. in oberfla È chennahen Bereichen und werden fu È nf-, sechs-und siebenfach von Sauerstoff koordiniert. Na 1.89 Ag 0.11 [BP 2 O 7 (OH)] and Na 2 [BP 2 O 7 (OH)] ± Isotypic Borophosphates Containing Layered Tetrahedral Blocks Abstract. The isotypic borophosphates Na 1.89 Ag 0.11 [BP 2 O 7 (OH)] and Na 2 [BP 2 O 7 (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 1.89 Ag 0.11 [BP 2 O 7 (OH)] and by refinement of powder data (Rietveld method) for Na 2 [BP 2 O 7 (OH)], respectively (orthorhombic, Pna2 1 (No. 33); a = 683.98(14)/ 682.36(1) pm, b = 2086.5(4)/2079.11( ) 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.
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