Acta Crystallographica Section C

Crystal Structure Communications

Volume 68, Part 9 (September 2012)


organic compounds



sf3176 scheme

Acta Cryst. (2012). C68, o355-o358    [ doi:10.1107/S0108270112033392 ]

Melaminium (2-carb­oxy­eth­yl)(phen­yl)phosphinate monohydrate

J. Xue, C.-C. Zhao and Z.-Y. Du

Abstract: Cocrystallization of melamine (1,3,5-triazine-2,4,6-triamine, ma) with (2-carb­oxy­eth­yl)(phen­yl)phosphinic acid (H2L) from water affords the title compound, C3H7N6+·C9H10O4P-·H2O or (maH)(HL)·H2O, (I). The phosphinic acid H atom of each H2L 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][infinity] ribbons and anionic {[(HL)2(H2O)2]2-}[infinity] 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][infinity] ribbons being further stabilized by [pi]-[pi] stacking inter­actions. It is also worthy of note that two conformational isomeric R65(24) hydrogen-bond ring motifs can be identified in the {[(HL)2(H2O)2]2-}[infinity] layer.

Formula: C3H7N6+·C9H10O4P-·H2O


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[ doi:10.1107/S0108270112033392/sf3176Isup3.cml ]
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