Growth, characterization and theoretical parameter study of benzimidazole L-tartrate single crystal: a nonlinear optical material


Good quality, non-hygroscopic and transparent crystals of organic benzimidazole L-tartrate (BILT) were grown successfully with a slow evaporation method. The powder X-ray diffraction patterns were analysed with Powder-X software which confirms the monoclinic crystal structure. The charge distribution, transport mechanism and intramolecular bonding mechanism have been investigated with the help of natural bond orbital analysis and molecular electrostatic potential diagram. The presence of various functional groups was confirmed with the help of FTIR–ATR response. The values were compared with the values obtained from computational output with the help of Gaussian software. The crystalline quality was further analysed with UV–visible spectral analysis. The lower cut-off wavelength of 288 nm and further optical parameters like band gap, change in refractive index with wavelength and extinction coefficient values support the usage of the material for optoelectronic devices. With band gap of 4.2 eV, the reactivity of material has been observed with the HOMO and LUMO study. The TGA and DTA analyses confirm the thermal stability of the material up to 192°C. The lower dielectric constant and lower dielectric loss support the usage of the material for an NLO device. The hopping motion and Joncher’s power law parameters were also obtained. The material decomposes in single-phase which observes in a range of 180–250°C. The second harmonic generation capacity of the material is found to be 2.69 times that of the KDP with the help of Kurtz and Perry powder technique.

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Raval, H., Raval, P.S., Parekh, B.B. et al. Growth, characterization and theoretical parameter study of benzimidazole L-tartrate single crystal: a nonlinear optical material. Bull Mater Sci 44, 38 (2021).

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  • Crystal growth
  • organic nonlinear optical material
  • second harmonic generation
  • DFT
  • UV–visible