Structure of N,N′,N″-tris(carboxymethyl)-1,3,5-benzenetricarboxamide trihydrate

The title compound, C₁₅H₁₅N₃O₉·3H₂O, crystallizes in the centrosymmetric space group R3̄ with a = 13.642(5), b = 13.642(5), c = 18.692(5) Å, D_calc = 1.440 g cm³, and z = 6. An extensive three-dimensional hydrogen bonded network is observed. The network arises from 15 hydrogen bonds per asymmetric unit. Six identical N - H⋯O hydrogen bonds are formed between two triacid molecules, which results in the face-to-face dimerization of the two triacid molecules. The dimers form extended sheets through hydrogen bond interaction with water molecules. The sheets are held together by hydrogen bonds via the water molecules. The planes of the benzenoid ring are parallel to each other.