Growth and characterization of l-phenylalanine nitric acid, a new organic nonlinear optical material |
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Authors: | M Lydia Caroline S Vasudevan |
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Affiliation: | a Department of Physics, Bharath University, Selaiyur, Chennai-600 073, India b Department of Physics, Easwari Engineering College, Ramapuram, Chennai-600 089, India |
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Abstract: | A new organic nonlinear optical material L-phenylalanine nitric acid 2C9H11NO2.H+. NO3−] (LPN), was synthesized in mixed solvent of deionised water and methanol and single crystals of LPN was grown by slow evaporation method. Transparent crystals upto 2.9 × 0.3 × 0.05 cm3 were obtained. The grown crystals have been subjected to powder X-ray diffraction studies to identify the crystalline nature. Single crystal X-ray diffractometer was utilized to measure unit cell parameters and to confirm the crystal structure. The modes of vibration of different molecular groups present in LPN were identified by FTIR spectral analysis. Transmission spectra reveals that the crystal has low UV cutoff of 295 nm and has a good transmittance in the entire visible region enabling its use in optical applications. Thermal properties of the crystals have been investigated using thermogravimetric (TG) and differential thermal analyses (DTA), which indicate that the material does not decompose before melting. The existence of second harmonic generation signals was observed using Nd:YAG laser with fundamental wavelength of 1064 nm. |
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Keywords: | Crystal growth Optical material X-ray diffracton Thermal properties |
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