Abstract
AbstractMetaphosphimates are possible precursors for oxonitridophosphates. A new polymorph of trimetaphosphimic acid, in fact an oxonium trimetaphosphimate monohydrate, crystallizes in the monoclinic space group P21/c. It exhibits coin‐roll‐like stacks of H2(PO2NH)3− anions in a rectangular pattern, whereas these form a hexagonal arrangement in the known polymorph. Ring conformation analysis reveals a state between boat and twist conformations, closer to the boat conformation. Temperature‐dependent powder diffraction shows decomposition upon heating to ca. 100 °C.
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