The organic adduct compounds of 2-nitrobenzoic acid crystals were grown as optically transparent crystals using the conventional slow evaporation solution technique. The crystals were powdered and irradiated with cold plasma. Cell parameter analysis confirmed the formation of a new crystalline material that resides in the triclinic P crystal system with space group P1. Fourier transform infrared spectra were recorded using the KBr pellet technique to determine the vibrational functional groups in the compound. Powder X-ray diffraction analysis was used to reveal the crystalline orientation of the powdered samples of the grown crystals. The obtained full width at half maximum for the (001) plane in the XRD spectrum indicates the excellent crystalline quality of the 2-nitrobenzoic acid crystals. The recorded UV–Vis absorption spectra reveal that the grown powdered crystal samples possess cut-off edges wavelengths at 428 and 428 nm and 353 and 354 nm for pure and plasma-treated samples, respectively. The optical energy bandgaps were found to be 2.0, 2.25, 4.06, and 4.02 eV for the pure and plasma-treated samples, respectively. The photoluminescence spectra show the blue emissions of the crystal. The FE-SEM images show the morphological modifications in which rounded platelets appear on the surfaces of the treated crystals.

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The non-covalent interactions of propylamine (pa) with 2-chlorobenzyl alcohol (2cbOH) in benzene have been studied by theoretical and dielectric relaxation studies. In the theoretical method, the optimized structure of pa2cbOH is achieved by the DFT method in B3LYP/6-311++G (d,p) basis set at ground level d,p orbitals. The Vibrational energy distribution analysis is adopted to find the vibrational assignment of pa2cbOH, as well as it compared with the experimental observations. Stability, electronic effects are determined through the chemical reactivity parameters with the help of FMO analysis. The hydrogen bonding and Vander Waals interactions of pa2cbOH are confirmed with reduced density gradient (RDG) isosurface. In Dielectric relaxation analysis, various dielectric parameters like ε′, ε″, ε₀ and ε_∞ were determined for five different mole ratios of pa2cbOH. Higasi’s single frequency equation and Gopalakrishna’s single frequency concentration variation methods are validated by measuring the multiple relaxation time τ₁ and relaxation time τ₂ for group rotation of pa2cbOH. The strength of hydrogen bonding and other weak interactions were determined using the values τ₁ and τ₂.

Aqueous solutions of mono, di, and triprotic acids were prepared with different molar percentages (say 10%, 20% and 30%). ammonium dihydrogen phosphate is gradually introduced in the aqueous solutions at different concentrations varied from 0.1M to 0.6M at 303K. Densities, viscosities, and velocity of sound of aqueous solutions are measured and they are used to evaluate the other parameters like adiabatic compressibility (β), free length (Lf), internal pressure (πi), apparent molar volume (φV), apparent molar compressibility (φK) and relative Association (RA) of the solution. Experimental results are analyzed based on molecular associations like hydrogen bonding and dipole-dipole interactions between the component molecules, which revealed that the variation of the parameters with the different molar concentrations of both ammonium dihydrogen phosphate and the acids.