Five pseudopolymorphs and a cocrystal of nitrofurantoin

Drug-Drug Binary Solids of Nitrofurantoin and Trimethoprim: Crystal Engineering and Pharmaceutical Properties

With the aim of developing multidrug solids through a tuned crystal engineering approach, we have selected two antiurinary infective drugs, namely, nitrofurantoin (NF) and trimethoprim (TMP) and isolated eight binary drug-drug solid solvates along with a nonsolvated cocrystal. Crystal structure analyses were performed for eight of these solids and rationalized in terms of known supramolecular synthons formed by pyrimidine, imide, and amine functionalities. Notably, the TMP-NF anhydrous cocrystal and its ionic cocrystal hydrate exhibit enhanced equilibrium solubilities compared to pure NF or the simple NF hydrate. Furthermore, the ionic cocrystal hydrate exhibits greater antibacterial activity against the Gram-negative bacteria, E. coli, compared to the parent TMP and NF at the lowest concentration of 3.9 μg/mL. This study indicates initial pathways using the cocrystal methodology that would help to eventually arrive at an antiurinary cocrystal with optimal properties.

Nitro-furan-toin methanol monosolvate

The anti-biotic nitro-furan-toin {systematic name: (E)-1-[(5-nitro-2-fur-yl)methyl-idene-amino]-imidazolidine-2,4-dione} crys-tallizes as a methanol monosolvate, C(8)H(6)N(4)O(5)·CH(4)O. The nitro-furan-toin mol-ecule adopts a nearly planar conformation (r.m.s. deviation = 0.0344 Å). Hydrogen bonds involve the co-operative N-H⋯O-H⋯O heterosynthons between the cyclic imide of nitro-furan-toin and methanol O-H groups. There are also C-H⋯O hydrogen bonds involving the nitro-furan-toin mol-ecules which support the key hydrogen-bonding synthon. The overall crystal packing is further assisted by weak C-H⋯O inter-actions, giving a herringbone pattern.