Crystal growth and characterization of Benzimidazolium salicylate single crystal for nonlinear optical studies and antibacterial activity
29 Sep 2020-Vol. 21, Iss: 3, pp 377-389
TL;DR: In this article, organic non-linear optical BISA single crystals were harvested from methanol solution by slow evaporation method and the properties of the grown BISA crystal were confirmed by PXRD.
Abstract: Organic non-linear optical Benzimidazolium salicylate (BISA) single crystals have been harvested from methanol solution by slow evaporation method. The grown crystals belong to the monoclinic crystal system with space group P21/c. Good crystalline nature of grown BISA crystal was confirmed by PXRD. The FTIR spectrum analysis affirms the presence of functional groups in BISA crystal. From the UV‒Vis-Absorption spectrum, the lower cut-off wavelength (356 nm) and its energy band gap and linear refractive index were calculated. Luminescence spectrum was recorded to explore the emission peak at 426 nm. The mechanical strength of BISA crystal was determined by Vickers microhardness tester and mechanical parameters like C11, Hk, Kc, and Bi were calculated for the first time. Dielectric properties of grown crystals were systematically investigated for different temperatures. Further, electronic polarizability (α) were calculated using Penn analysis and Clausius‒Mossotti equation. Z‒scan measurement was taken to explore the third-order NLO properties of BISA crystal. For the first attempt, the BISA crystals were tested against five human pathogenic bacterial, i.e. Bacillus cereus, Staphylococcus aureus, Shigella flexneri, Vibrio cholerae, and Klebsiella pneumoniae. Existing results established that Benzimidazolium salicylate crystals might find useful applications in nonlinear optics and antimicrobial field.
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TL;DR: In this paper, investigations on Glycine doped in Zinc Sulphate, ammonium sulphate and ammonium sulfate were reported for the first time, and the results showed that the grown crystal belongs to hexagonal crystal structure with a P31 space group.
Abstract: In this paper, investigations on Glycine doped in Zinc Sulphate, ammonium sulphate were reported for the first time. Single crystals Glycine and zinc-ammonium sulphate were grown at room temperature by slow evaporation technique. Single‐crystal X‐ray diffraction studies show that the grown crystal belongs to hexagonal crystal structure with a P31 space group. Inductively coupled optical emission spectrometry studies were analyzed to know the Zinc Sulphate-ammonium sulphate element presence in the grown new material. To find the title material crystalline nature Powder X-ray diffraction analysis was carried out, and using FT-IR the grown crystal functional groups was identified. Thermal behavior and melting point of the sample was found using TG/DTA-DSC analysis which indicated that the material does not decompose before melting. The emission of green light on passing the Nd: YAG laser light confirmed the second harmonic generation property of the crystals and the SHG efficiency of the crystals was found to be higher than that of KDP. The NLO test confirms the second harmonic signal generation in the sample. The UV–Vis–NIR result shows that the crystal has a sharp cut off at 210 nm and is nearly 75% transparent over a wide wavelength range enabling it for application in the UV region. To know the grown crystal surface morphology scanning electron microscopy analysis was done. The antibacterial activity was carried out for the title compound using agar diffusion method. The test compounds were screened in vitro for their antibacterial activity against three Gram-positive species (Staphylococcus aureus) (E. coli, Salmonella typhi) of bacterial strains and also against two fungal strains i.e., Aspergillus Niger and Aspergillus clavatus.
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TL;DR: In this article, a semi-organic nonlinear crystal l-Lysine hydrogen chloride (LLHC) was grown by slow evaporation method using a mixed solvent of deionized water + ethanol and pure deionised water.
Abstract: This manuscript is discussing the growth of a new class semi-organic nonlinear crystal l-Lysine hydrogen chloride (LLHC) was grown by slow evaporation method using a mixed solvent of deionized water + ethanol and pure deionized water. The crystal crystallizes in orthorhombic space group of P212121. Lattice parameters were revealed by single crystal X-ray diffraction analysis. The FT-IR spectral analysis was performed on the grown crystal LLHC to identify its functional groups. The position of protons and carbons was determined by the NMR technique. The grown crystal was characterized by optical transparency through UV–Vis range with a short cutoff wavelength of 212nm. Thermal and physiochemical stability of the title crystal was found out through the TG-DTA analysis, which proves the crystal stability up to 251.4 °C. Brewster’s point method was used to find out the refractive index of the grown compound LLHC. Vickers’s microhardness test was performed on LLHC to find out its mechanical stability. The second harmonic generation (SHG) of the grown crystal LLHC was confirmed by the Kurtz-perry powder method and the SHG efficiency was compared with the known Potassium Dihydrogen phosphate (KDP) standard. By using a minimal bactericidal concentration (MBC) benchmark, their antibacterial activity was evaluated. The grown crystal shows long-term and outstanding antibacterial activity against E.coli and S.aureus.
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TL;DR: A promising optically prospective D-Alanine DL-Mandelic acid (DADLMA) was successfully grown at room temperature by a slow solvent evaporation approach as discussed by the authors .