International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Special Issue: 09 | Sep -2017
p-ISSN: 2395-0072
www.irjet.net
One Day International Seminar on Materials Science & Technology (ISMST 2017) 4th August 2017 Organized by
Department of Physics, Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
Synthesis, growth and optical properties of L-threoninium chloride for opto electronic applications R. Anbarasan1 and J. Kalyana Sundar2 1,2
Material Science Laboratory, Department of Physics, Periyar University, Salem-636 011, Tamilnadu, India.
----------------------------------------------------------------***----------------------------------------------------------------infrared spectrometry, UV-Vis-NIRanalysis and SHG Abstract - The complex of amino acids and their salts are studies.
promising materials for optoelectronic applications. Organic systems were investigated as an alternative to inorganic species because of their low cost, fast and large nonlinear response over a broad range. A new charge transfer complex of organic crystal, L-threoninium chloride has been successfully synthesized by conventional slow evaporation method from aqueous solution. The grown crystal is structurally characterized by powder X-ray diffraction. The various functional groups present in the crystals are identified and the formation of molecular structure is confirmed by FTIR analysis. The UV-Vis-NIRanalysis revealed the transparency of the grown crystal is about 80% in the entire visible region. The NLO property was measured using Kurtz-Perry powder technique and SHG efficiency of the crystal is 50% times that of KDP.
2. Materials and methods L-threoninium chloride (LTC) crystal was synthesized from equimolar amounts of L-threonine (SRS Chem.) and Hydrochloric acid (35 % Rankem Chem.). The calculated amount of L-threonine was first dissolved in double distilled water. To this solution an equivalent molar amount of the acid was slowly added accompanied good stirring by a temperature controlled magnetic stirrer to yield a homogeneous mixture of solution. The acid necessarily protonates the amino group of L-threonine resulting in the formation of L-threoninium chloride. The reaction scheme of LTC is shown in figure 1. The synthesized salt solution was left for crystallization by slow evaporation from a saturated aqueous solution, in a crystallizing vessel. After a period of 20 days the optically transparent and well-shaped single crystal of Lthreoninium chloride of size ~ 15 x 3 x 2 mm3 was harvested in 20 days period and is shown in insert of figure 2.
Key Words: L-Threonine, Slow evaporation, Charge transfer complex, Single crystal, NLO crystals.
1. Introduction In recent years the nonlinear optical materials increased tremendously due to the reason of photonic applications. The organic compounds have the important role in nonlinear optics, because they have the high charge transfer mobility, high laser damage threshold and high optical responsibility [1].Materials with NLO activity find useas electro-optic switching elements for telecommunication andoptical information processing. The proton donor carboxyl group and proton acceptor amino groups contributes physicochemical properties of the material [2].L-threonine derivatives have the much contribution in the NLO materials such asL-threonine, Lthreonine picrate and L-threoninium acetate, etc [3][4][5].Motivated by the above specifies, the Lthreoninium chloride (LTC) organic charge transfer single crystal is synthesized. The grown crystal is characterized properly such as X-ray diffraction, Fourier transfer
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Fig– 1: The reaction scheme of LTC
3. Powder X-ray diffraction analysis The powder X-ray diffraction analysis has been carried out to confirm the crystallinity of grown crystal using Rigaku Miniflex- II diffractometer with CuKα (1.5406 Å) radiation. The powdered sample scanned between the range of 5-80o with scanning rate of 2o/min. The narrow
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