Kalium-Lanthanoid-Carbonate, KM(CO3)2 (M ? Nd, Gd, Dy, Ho, Yb)

Autor: Rudolf Wartchow, Hinrich Seidel, Hans‐Jürgen Kalz, Hartmut Ehrhardt, Gerd Meyer, Ibrahim Kutlu
Rok vydání: 1997
Předmět:
Zdroj: Zeitschrift f�r anorganische und allgemeine Chemie. 623:1753-1758
ISSN: 1521-3749
0044-2313
DOI: 10.1002/zaac.19976231115
Popis: Die ternaren Kalium-Lanthanoid-Carbonate KM(CO3)2 (M Nd, Gd, Dy, Ho, Yb) erhalt man in Form von Einkristallen durch Hochdrucksynthese im Stahlautoklaven mit Kohlendioxid (Anfangsdruck etwa 50 bar bei Raumtemperatur) in Anwesenheit von Wasser aus Gemengen von K2CO3 und MCl3 · x H2O (x = 7 bzw. 6) bei 450°C innerhalb von 4 Wochen. In KNd(CO3)2 (orthorhombisch, Pmn21, Z = 4; a = 973,1(2); b = 645,69(8); c = 855,58(14) pm; R1 = 0,0763 fur alle Daten) werden Polyeder [Nd-μ1-(CO3)3-μ2-(CO3)3] ahnlich wie in UO2(CO3) zu Schichten [Nd(CO3)] verknupft; die Schichten werden uber die zweite Halfte von CO32−-Liganden sowie durch K+ dreidimensional verknupft. In KDy(CO3)2 (monoklin, C2/c, Z = 4; a = 853,8(2); b = 949,1(1); c = 694,5(1) pm; β = 111,1(2)°; R1 = 0,0266 fur alle Daten) und in den isotypen Carbonaten KM(CO3)2 (M = Gd, Ho, Yb) sind die Polyeder [Dy-μ1-(CO3)4-μ2-(CO3)2] und [K-μ1-(CO3)6] jeweils zu „syndiotaktischen” Zick-Zack-Ketten und weiter uber gemeinsame O-Ligatoratome der Carbonat-Liganden so verknupft, das die Zick-Zack-Ketten jeweils von vier Ketten der anderen Sorte umgeben sind. Potassium Lanthanoid Carbonates, KM(CO3)2 (M Nd, Gd, Dy, Ho, Yb) The ternary potassium lanthanoid carbonates KM(CO3)2 (M Nd, Gd, Dy, Ho, Yb) are obtained as single crystals by high-pressure synthesis in steel autoclaves with carbon dioxide (starting pressure approximately 50 bar at ambient temperature) in the presence of water from a mixture of K2CO3 and MCl3 · x H2O (x = 7 and 6, respectively) at 450°C within 4 weeks. In KNd(CO3)2 (orthorhombic, Pmn21, Z = 4, a = 973.1(2), b = 645.69(8), c = 855.58(14) pm, R1 = 0.0763 for all data) [Nd-μ1-(CO3)3-μ2-(CO3)3] polyhedra are connected three-dimensionally to [Nd(CO3)] layers as similarly in UO2(CO3); these layers are connected via the second half of the carbonate ligands and K+ ions. In KDy(CO3)2 (monoclinic, C2/c, Z = 4, a = 853.8(2), b = 949.1(1), c = 694.5(1) pm, β = 111.1(2)°, R1 = 0.0266 for all data) and in the isotypic carbonates KM(CO3)2 (M = Gd, Ho, Yb) the polyhedra [Dy-μ1-(CO3)4-μ2-(CO3)2] and [K-μ1-(CO3)6] are connected to “syndiotactic” zig-zag chains and by further O-ligator atoms of the carbonate ligands such that each zig-zag chain is surrounded by four unlike chains and vice versa.
Databáze: OpenAIRE
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