Synthesis, characterization and solubility of a new anthelmintic salt: Mebendazole nitrate

Add time:07/29/2019    Source:sciencedirect.com

Salt formation approach was taken to improve Mebendazole (MBZ) solubility. MBZ polymorph A was easily recrystallized as a 1:1 nitrate salt (MBZ N) in methanol. Single crystal X-ray diffraction data show that MBZ N crystallizes in the P1¯ space group. By strong intermolecular H-bonding interactions, MBZ is associated with a nitrate anion forming a supramolecular R22(8) synthon. Crystal packing is stabilized by these H-bonds, through which each nitrate connects two molecules of MBZ forming chains along the b axis. The vibrational behavior studied by micro FT-Raman and FT-IR spectroscopy is consistent with the crystal structure. Thermal analysis of the salt indicates that the compound is stable up to 150 °C, when an almost simultaneous elimination of HNO3 and CO2 occurs. MBZ N equilibrium solubility was evaluated in hydrochloric acid 0.1 M solution and compared with those of MBZ A and C. An improvement in a factor of 5 and 1.22 was found respectively.

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