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The trimetaphosphimate nion (PO2NH)~- in trisodium cyclo-td-#-imido-triphosphate monohydrate, Na3(PO2-NH)3.H20, exhibits a chair conformation. Two trimeta-phosphimate ings are linked to one another by six N--H.-.O hydrogen bonds forming pairs. These units are interconnected by O---H...O hydrogen bonds through water molecules forming columns. Comment In contrast to the well known structural chemistry of tfimetaphosphates (Durif, 1995), only very few structural details about trimetaphosphimates are known despite the fact that many salts of trimetaphos-phimic acid were known more than 100 years ago (Stokes, 1895). These compounds have been mainl