A new organic charge transfer molecular complex salt of benzimidazolium salicylate (BSL) single crystals was grown by the slow evaporation solution growth technique using methanol as a solvent at room temperature. The grown crystals were characterised by single crystal X-ray diffraction (XRD) which confirms that the crystal belongs to monoclinic system with the centrosymmetric space group P2 1 / . The crystalline perfection of the grown crystal was analyzed by high resolution X-ray diffraction (HRXRD). The presence of various functional groups was identified by FTIR spectrum. UV-Vis spectral study reveals that the BSL crystal is optically transparent in the wavelength region 342 nm-1100 nm. Dielectric measurements of the crystal at various frequencies were also determined. The mechanical properties of the grown crystal were assessed using Vickers microhardness testing. Nonlinear optical property of the crystal was confirmed using Kurtz and Perry powder technique and the SHG efficiency of the BSL crystal is 0.7 times greater than that of the standard KDP crystal.

In the anion of the title mol­ecular salt, C7H7N2 +·C7H5O3 − (systematic name: 1H-benzimidazol-3-ium 2-hy­droxy­ben­zo­ate), there is an intra­molecular O—H⋯O hydrogen bond that generates an S(6) ring motif. The CO2 group makes a dihedral angle of 5.33 (15)° with its attached ring. In the crystal, the dihedral angle between the benzimidazolium ring and the anion benzene ring is 75.88 (5)°. Two cations bridge two anions via two pairs of N—H⋯O hydrogen bonds, enclosing an R 4 4(16) ring motif, forming a four-membered centrosymmetric arrangement. These units are linked via C—H⋯O hydrogen bonds, forming chains propagating along the b-axis direction. The chains are linked by C—H⋯π and π–π inter­actions [inter-centroid distances = 3.4156 (7) and 3.8196 (8) Å], forming a three-dimensional structure.

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Aim:The main aim of this present investigation is to apply the hydrotropic solubilization phenomenon for spectroscopic analysis of poorly water-soluble drugs to avoid the use organic solvents which may be costlier, toxic to environment, volatile, and pollutant. Materials and Methods: A simple ultra violet spectroscopic method was used for the content analysis by diluting the drug cefixime with various hydrotropic agents. In this study, 20% solutions of sodium salicylate (SS), sodium citrate (SC), sodium acetate (SA), and sodium benzoate (SB) were used as hydrotropes for the analysis of cefixime. Results and Discussion: The drug cefixime showed the linearity of 0.5-2 µg/mL in SS, 5-30 µg/mL in SC, 5-50 µg/mL in SA, and 0.05-0.30 µg/mL in SB solution. Then the proposed methods were validated with respect to accuracy and precision as per International Conference of Harmonization guidelines Q2 (R1), November 2005 (Validation of Analytical Procedures: Text and Methodology). The drug showed less limit of detection (LOD) and limit of quantification (LOQ) values (LOD = 0.0225471 µg/mL and LOQ 0.0683246 µg/mL) to SB solution and it obeyed the Beer's law at very low concentration range (0.05-0.30 µg/mL) which proved that the drug has high sensitivity with SB solution. Conclusions: Finally, it was concluded that the all proposed methods were simple, cost-effective, safe to environment, rapid, reproducible, and highly sensitive with SB solution.

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In the cation of the title molecular salt, C7H7N2+·C4H6NO4−(systematic name: 1H-benzo[d]imidazol-3-ium 2-azaniumylsuccinate), the benzimidazole ring system is almost planar (r.m.s. deviation = 0.012 Å). The cation is protonated at the N atom and the L-aspartate zwitterion is deprotonated at both carboxyl groups. In the anion, an N—H...O hydrogen bond and an N—H...O short contact generateS(6) graph-set motifs. In the crystal, the anions are linkedviathree N—H...O hydrogen bonds involving the NH3+group, forming layers parallel to theabplane. The benzimidazolium cations are linked to these layers by N—H...O hydrogen bonds. The layers are linkedviaC—H...O hydrogen bonds involving the benzimidazolium cation, forming a three-dimensional structure. There are also C—H...π interactions present involving inversion-related benzimidazolium cations.

In the anion of the title molecular salt, C7H7N2+.C4H3O4−, an O—H...O hydrogen bond generates anS(7) graph-set motif while a pair of intermolecular N—H...O and C—H...O hydrogen bonds generate anR44(10) ring-motif. Adjacent anions and cations are further connected through N—H...O hydrogen bonds into infinite chains along [101] and these chains are linked by C—H...O hydrogen bonds, forming a three-dimensional network.

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