Abstract
Good quality novel semiorganic nonlinear optical single crystal of d-phenylglycine hydrochloride has been grown from the aqueous solution by low temperature solution growth method. X-ray diffraction reveals that the crystal crystallises into orthorhombic system with noncentrosymmetric space group P212121. Experimental parameters are evaluated based on single-crystal XRD and the calculated values of the polarisability were compared with the values of polarisability using Clausius–Mossotti equation. The functional groups present in the grown crystal were confirmed by Fourier transform infrared spectral analysis. The 1H and 13C FT–NMR has been recorded to elucidate the molecular structure. Ultraviolet–visible-near infra-red absorption studies on this crystal reveal that the minimum absorption region is around 228 nm. The optical band gap of the crystal was found to be 2.9 eV. The scanning electron microscope study has been carried out to determine the surface morphology of the grown crystal. Photoluminescence studies show that the material emits violet fluorescence. Thermal studies bring forth that the crystal is thermally stable up to 255 °C. Dielectric studies reveal that both the dielectric constant and dielectric loss decrease with the increase in frequency as like the typical semiorganic nonlinear optical crystals such as bisthiourea zinc chloride, bisthiourea cadmium chloride and l-arginine dihydrogen phosphate. Electrical conductivity measurements were carried out and the Arrhenius plot is used to determine the value of activation energy. The Kurtz powder analysis on the crystal confirms the existence of second harmonic generation properties. The SHG efficiency was found to be 1.15 times that of KDP crystal.
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Acknowledgments
The authors would like to thank the authorities and scientist working in sophisticated analytical instrumentation facilities (SAIF) at Indian Institute of Technology, Chennai, for their help in completing the characterisation. The first author would like to extend her thanks to Dr. Edamana Prasad, Associate professor, Department of Chemistry, I.I.T. Madras, for his help in photoluminescence studies. She is grateful to Prof. P.K. Das, Department of Inorganic and Physical chemistry, Indian Institute of Science, Bangalore for having extended the laser facilities for the SHG measurement.
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Uma, B., Sakthi Murugesan, K., Jayavel, R. et al. Growth, spectral, optical, and dielectric studies on novel semiorganic NLO single crystal: d-phenylglycine hydrochloride. Appl. Phys. B 115, 215–224 (2014). https://doi.org/10.1007/s00340-013-5592-1
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DOI: https://doi.org/10.1007/s00340-013-5592-1