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Melaminium (2‐carboxyethyl)(phenyl)phosphinate monohydrate

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Cocrystallization of melamine (1,3,5‐triazine‐2,4,6‐triamine, ma) with (2‐carboxyethyl)(phenyl)phosphinic acid (H2 L) from water affords the title compound, C3H7N6 +·C9H10O4P·H2O or (maH)(HL)·H2O, (I). The phosphinic acid H atom of each H2 L molecule is transferred to a melamine molecule. Structural analysis reveals that there are two types of secondary building units in the crystal structure, namely cationic [(maH+)2] ribbons and anionic {[(HL)2(H2O)2]2−} layers, the combination of which through hydrogen‐bond and electrostatic interactions, generates a large‐scale two‐dimensional layered structure. The thick layer is sandwich‐like, with the central [(maH+)2] ribbons being further stabilized by π–π stacking interactions. It is also worthy of note that two conformational isomeric R 6 5(24) hydrogen‐bond ring motifs can be identified in the {[(HL)2(H2O)2]2−} layer.
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Document Type: Research Article

Affiliations: College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, Jiangxi 341000, People's Republic of China

Publication date: September 15, 2012

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