Abstract
The spectroscopic and structural morphology properties of the charge transfer (CT) complex of the anticholinergic drug clidinium bromide (CB) with picric acid (PA) have been studied in three polar solvents—acetonitrile (MeCN), methanol (MeOH) and ethanol (EtOH)—at room temperature. The formed CT complex in each solvent was characterized in both solution and solid state using electronic, IR, and 1H and 13C NMR spectroscopies and XRD, SEM, TEM, and CHN elemental analyses. The outcome suggests that the formation of the CT complex is high in less polar solvent and that its spectroscopic and morphologic characteristics are markedly affected by the variation in solvent polarity. The CT complex exhibited a significant microstructural change from tubal-like aggregates in MeCN solvent to mixed irregularly polygonal and spherical shapes in MeOH solvent to rounder spheres in EtOH solvent.
The solvent significantly affects the structural morphology of the complex formed between the drug clidinium bromide and picric acid. In more polar solvent (MeCN), the complex forms tubal-like aggregates. The morphology of these aggregates changed to mixed polygonal and spherical nanoparticles in MeOH solvent. In less polar solvent (EtOH), the complex forms more nano- and spherical–ovoid particles with an average size of ~28nm. [Display omitted]
•The CT complex of the drug clidinium bromide with picric acid was reported.•The complex was characterized in three polar solvents.•Microstructures of the complex were obtained by XRD, SEM and TEM.•Significant solvent effects on the morphology of the complex were observed.