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The trimetaphosphimate anion (PO2NH)33− in trisodium cyclo-tri-μ-imidotriphosphate monohydrate, Na3(PO2NH)3.H2O, exhibits a chair conformation. Two trimetaphosphimate rings are linked to each other by six N-H
O hydrogen bonds forming pairs. These units are interconnected by O-H
O hydrogen bonds through water molecules forming columns.
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