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Influence of Picric Acid on the SHG Efficiency of L-Prolinium Tartrate Crystals

Journal of Minerals and Materials Characterization and Engineering 2011年第10期10卷 913-921页

作者： S. Natarajan k. moovendaran J. k.lyana Sundar G. Bhagavannarayana S.A. Martin Britto Dhas Material Characterization Division National Physical Laboratory New Delhi 110012 India School of Physics Madurai Kamaraj University Madurai-625 021 India

Single crystals of the NLO material L-Prolinium tartrate (LPT) have been grown in the presence and absence of picric acid, by slow evaporation technique. Good quality crystals were harvested within 30 days. The grown crystals were characterized by single crystal X-ray diffraction. The quality of the crystals grown in the presence and absence of picric acid was examined by high resolution X-ray diffractometry (HRXRD). Fourier transform infrared spectroscopy (FTIR) and Fourier transform Raman spectroscopy were used to confirm the presence of the functional groups of L-Prolinium tartrate and the absence of picric acid in the crystals. The thermal stability and the trend of decomposition of the grown crystals were analyzed by thermo gravimetric analysis (TGA). The influence of picric acid on the second harmonic generation efficiency was studied by k.rtz and Perry method. It was observed that the SHG efficiency increased by about 2.3 times compared to that of normal LPT crystals. The results are discussed in detail.

关键词： organic compounds crystal growth X-ray diffraction thermo-gravimetricanalysis

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Bulk.Growth and Characterization of D-(–)-Alanine Single Crystals

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Journal of Crystallization Process and Technology 2013年第4期3卷 130-135页

作者： k.limuthu moovendaran Subramanian Natarajan School of Physics Madurai Kamaraj University Madurai India.

Single crystal of D-(–)-alanine (DALA), a non-linear optical material from the amino acid family was grown using a home-made crystal growth setup. The crystals of DALA were also grown by slow evaporation solution technique (SEST). The grown crystals were characterized by using single crystal X-ray diffraction, high resolution X-ray diffraction (HRXRD) and UV-vis-NIR and CD spectroscopy. Measurements of Vick.r’s microhardness, laser damage threshold (LDT) value and second harmonic generation (SHG) efficiency are also reported. Thermal and dielectric studies were also carried out.

关键词： D-(–)-Alanine NLO Material Mk. Setup HRXRD CD SHG

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Reinvestigation of the Crystal Growth of “L-Proline Succinate” and “L-Threonine Zinc Acetate” Showing Use of Infrared Spectra for Product Identification

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Journal of Crystallization Process and Technology 2014年第2期4卷 121-125页

作者： Subramanian Natarajan Bik.handark.il R. Srinivasan k.limuthu moovendaran Department of Chemistry Goa University Goa India School of Physics Madurai Kamaraj University Madurai India

Reinvestigation of the growth of L-proline succinate (1) (Paramasivam and Ramachandra Raja, Journal of Crystallization Process and Technology, 2 (2012) 21 - 24;Balamurugaraj et al., Journal of Material Physics and Chemistry 1 (2013) 4 - 8) and L-threonine zinc acetate (2) (Puhal Raj and Ramachandra Raja, Photonics and Optoelectronics, 2 (2013) 56 - 64) is reported. Slow evaporation of an aqueous solution containing equimolar quantities of L-proline and succinic acid (for 1) and L-threonine and zinc acetate (for 2) results in the fractional crystallization of succinic acid (in the first case) and L-threonine (in the second case) and not any novel organic non-linear optical (NLO) crystals. In this paper, the usefulness of infrared spectra for correct product characterization is demonstrated.

关键词： L-Proline Succinate L-Threonine Zinc Acetate X-Ray Cell Data IR Spectra Non-Linear Optical Crystals

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