Abstract
A new organic nonlinear optical (NLO) material L-Histidinium trifluoroacetate was crystallized using L- Histidine and trifluoroacetic acid in 1:1 stoichiometric ratio in water-ethanol medium. X-ray diffraction analysis of the single crystals showed that they belong to triclinic system, space group P1, with two molecules per unit cell. The lat- tice parameters are a = 5.1673(2) A, b = 8.8393(3) A, c = 12.4837(6) A, = 96.190(3)°, = 100.020(3)° and =102.010 (3)°. The molecules are held together by a three-dimensional network of hydrogen bonds. The crystalline perfection was studied by high resolution X-ray diffraction. The second harmonic generation (SHG) efficiency was measured by Kurtz and Perry method. The FTIR, UV-Vis-NIR spectra and TGA/DTA were recorded and studied. Vickers microhardness measurement was also carried out.
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