Acta Cryst. (2005). E61, o2368-o2371  [ doi:10.1107/S1600536805020167 ]

Hydrogen-bonding patterns in bis(trimethoprim) dipicolinate pentahydrate

M. Hemamalini, P. T. Muthiah, G. Bocelli and A. Cantoni

Abstract: In the title compound, 2C₁₄H₁₉N₄O₃⁺·C₇H₃NO₄^2-·5H₂O, the asymmetric unit contains two trimethoprim cations (A and B), a dipicolinate anion and five water molecules. One of the picolinate carboxylate groups interacts with cation A via a pair of N-HO hydrogen bonds, forming a ring motif (8). A loop of O-HO hydrogen bonds is formed between four water molecules and the two carboxylate groups to form a supramolecular chain along the a axis. Molecules A and B constitute a base pair via N-HN hydrogen bonds, and these base pairs are cross-linked by N-HO and C-HO hydrogen bonds.

Online 6 July 2005

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