Semiorganic nonlinear optical L-lysine sulphate growth and characterization.
L-lysine sulphate (LLS), a semiorganic nonlinear optical (NLO) material useful for frequency doubling in the IR region, has been synthesized. The solubility studies have been carried out in the temperature range 30-50 degrees C. Single crystals have been grown by slow evaporation method from an aqueous acetone solution of l-lysine and sulphuric acid. The grown crystals were bulk, bright and transparent. These crystals were characterized by X-ray and FTIR studies. Powder X-ray pattern indicates that LLS crystallizes in orthorhombic space group P2(1)2(1)2(1) with four unit cells. FTIR spectral studies were performed for the conformation of the l-lysine molecule and hydrogen bonds. The optical transmission spectra of the grown crystal are tested by UV-vis spectrophotometer and found that the crystal was transparent over entire visible region. The second harmonic generation test of the LLS revealed the nonlinear nature of the crystal.
Krishnakumar
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Department of Physics, Periyar University, Salem, Tamilnadu, India. vkrishna_kumar@yahoo.com
Manohar
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S
Nagalakshmi
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R
D000096:Acetone / Q000737:chemistry; D000641:Ammonia / Q000737:chemistry; D003460:Crystallization; D018360:Crystallography, X-Ray; D006244:Hardness; D008239:Lysine / Q000737:chemistry*; D017711:Nonlinear Dynamics; D055620:Optical Phenomena; D012995:Solubility; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013431:Sulfates / Q000737:chemistry*; D014732:Vibration
D012996:Solutions; D013431:Sulfates; D000096:Acetone; D000641:Ammonia; D008239:Lysine