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Coarse crystalline Ag 3 (PO 2 NH) 3  (1) and K 3 (PO 2 NH) 3  (2) are obtained by addition of an aqueous solution of AgNO 3  to an acidified solution of Na 3 (PO 2 NH) 3  · 4H 2 O and by diffusion controlled addition of ethanol to a solution of K 3 (PO 2 NH) 3  in water, respectively. The crystal structures of 1 and 2 have been determined by single crystal X-ray methods (Ag 3 (PO 2 NH) 3 : P2 1 /c; a = 1166.6(1), b = 786.4(1), c = 997.8(1) pm, β = 106.91(1)°; Z = 4. K 3 (PO 2 NH) 3 : R3̄; a = 1271.4(2), c = 1017.9(2) pm, Z = 6). In Ag 3 (PO 2 NH) 3  the cyclic anion is markedly distorted because of interactions between Ag +  and one nitrogen atom of the anion. In K 3 (PO 2 NH) 3  the trimetaphosphimate ring shows a chair conformation and two cyclic anions are connected to each other by hydrogen bonds. DTA/TG investigations show thermal decomposition above 275 and 250 °C for 1 and 2, respectively.

zeitschrift für naturforschung b

Synthesen, Kristallstrukturen und Eigenschaften von Trisilber-und Trikalium-tri-μ-imido-cyclotriphosphat, Ag 3 (PO 2 NH) 3  und K 3 (PO 2 NH) 3  / Syntheses, Crystal Structures, and Properties of Trisilver and Tripotassium Tri-μ-im ido Cyclotriphosphate, Ag 3 (PO 2 NH) 3  and K 3 (PO 2 NH) 3