Synthesis, growth and characterization of a new nonlinear optical crystal: Glycinium hydrogen squarate (GHS)

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• 作者：P. Paramasivam^a ; C. Ramachandra Raja^b ; ^{crraja_phy@yahoo.com}
• 关键词：Nonlinear optical materials ; Characterization ; Second harmonic generation ; Crystal growth ; X-ray diffraction ; Powder XRD ; GHS crystal
• 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
• 出版年：2012
• 期刊代码：99_13861425
• 类别：ch
• 出版时间：July, 2012
• 卷：93
• 期：Complete
• 页码：81-85
• 文件大小：645 K

摘要

Single crystals of glycinium hydrogen squarate (GHS) have been successfully synthesized and purity of the material has been increased by repeated recrystallization process. Single crystals were grown by slow evaporation solution growth technique using water and ethanol as solvents at room temperature. Then the grown crystal was characterized by different techniques for finding its suitability for device fabrications. The grown crystal was characterized by single crystal XRD, powder XRD, FT-IR, UV-Vis-NIR, ¹H NMR, ¹³C NMR, SHG and DTA/TGA analyses respectively. From the single crystal XRD diffraction, the crystal system was identified as monoclinic. The presence of functional groups were identified by FT-IR analysis. The UV transparency cut-off wavelength of the grown crystal occurs at 342 nm. ¹H NMR and ¹³C NMR spectroscopic studies were employed to elucidate the structure of the grown crystal. The second harmonic generation efficiency test by Kurtz-Perry technique showed positive result. The decomposition temperature of the grown crystal was studied by DTA/TGA analysis. The results observed from the characterization analyses show its suitability for NLO applications.