Synthesen, Kristallstrukturen und Eigenschaften von Trisilber-und Trikalium-tri-μ-imido-cyclotriphosphat, Ag3(PO2NH)3und K3(PO2NH)3/ Syntheses, Crystal Structures, and Properties of Trisilver and Tripotassium Tri-μ-im ido Cyclotriphosphate, Ag3(PO2NH)3and K3(PO2NH)3

Coarse crystalline Ag3(PO2NH)3(1) and K3(PO2NH)3(2) are obtained by addition of an aqueous solution of AgNO3to an acidified solution of Na3(PO2NH)3· 4H2O and by diffusion controlled addition of ethanol to a solution of K3(PO2NH)3in water, respectively. The crystal structures of 1 and 2 have been determined by single crystal X-ray methods (Ag3(PO2NH)3: P21/c; a = 1166.6(1), b = 786.4(1), c = 997.8(1) pm, β = 106.91(1)°; Z = 4. K3(PO2NH)3: R3̄; a = 1271.4(2), c = 1017.9(2) pm, Z = 6). In Ag3(PO2NH)3the cyclic anion is markedly distorted because of interactions between Ag+and one nitrogen atom of the anion. In K3(PO2NH)3the 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.