Growth and Characterization of a New Organic Non-Linear Optical (NLO) Material: L-Histidinium Trifluoroacetate

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 lattice parameters are a = 5.1673 (2) Å, b = 8.8393(3) Å, c = 12.4837(6) Å, = 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.

Synthesis and Characterization of Nickel Doped Urea Thiourea Naphthylamine Single Crystal Developed by Slow Evaporation Method

“…The band gap energy (E g =hc/λ) was found to be10.46eV for pure and NiNTU crystals. The large transmission in the entire visible region and short cut off wavelength enables it to be a potential material for second and third harmonic generation [20][21][22][23][24][25][26][27] .…”

“…NLO materials are used in frequency conversion, which is a popular technique for extending the useful wavelength range of lasers. The search for new materials has identified novel semi organic systems of considerable potential and high performance [10][11][12][13][14][15][16][17][18][19][20][21] . There are three major stages involved in this research.…”

Synthesis and Characterization of Nickel Urea Thiourea Single Crystal Developed by Slow Evaporation Method

“…The above values indicates the presence chromophores such as amino, imino, carbonyl and thio carbonyl groups and the good optical transmittance in the entire visible region and the lower cut off wavelength (λ cut ) was observed as this is due to π-π* transition in the compounds. The band gap energy (E g = hc/λ) was found to be 3.87eV for pure and nickel urea thiourea crystals.The large transmission in the entire visible region and short cut off wavelength enables it to be a potential material for second and third harmonic generation [15][16][17][18][19][20][21][22][23][24][25][26][27] .…”