Growth and characterization of NLO based L-arginine maleate dihydrate single crystal.
Single crystals of L-arginine maleate dihydrate (LAMD) were successfully grown from aqueous solution by solvent evaporation technique. As-grown crystals were analyzed by different instrumentation techniques such as X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectra and UV-vis near infrared (NIR) transmittance spectra. Thermal behavior has been studied with TGA/DTA analyses. The optical second harmonic generation (SHG) conversion efficiency of LAMD was determined using Kurtz powder technique and found to be 1.5 times that of KDP.
Synthesis, growth and characterization of a new nonlinear optical crystal: l‐arginine maleate dihydrate
A new nonlinear optical material L‐arginine maleate dihydrate, C6H14N4O2,C4H4O4,2H2O (LAMD) was synthesized and single crystals were grown by slow cooling and also by slow evaporation method at constant temperature from its aqueous solution. Quality and size of the crystals are found to be dependent on pH of the solution and best crystals were obtained at pH = 4. Single crystal X‐ray diffraction analysis reveal that the crystal lattice of LAMD is triclinic with unit cell parameters a = 5.264(3)Å, b = 8.039(3)Å, c = 9.784(3)Å, α = 106.19(3)°, β = 97.24(3)°, γ = 101.66(2)°. Second harmonic generation efficiency is found to be about 6.8 times that of quartz. It is optically transparent down to 300 nm and possesses a large optical window between 300–2000 nm. The compound is thermally stable up to 93.4 °C. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Thermal and spectroscopic studies of as-grown L-arginine hydrochloride monohydrate crystals
Abstract Single crystals of l -arginine hydrochloride monohydrate (LAHCl) were successfully grown at ambient temperature (28.5°C) from its aqueous solution (pH=5.4) by slow evaporation as well as by slow cooling methods.The as-grown crystal is of dimensions 2.8×4.5×1.2 cm3. Studies on the structural, chemical and thermal properties of the crystal have been carried out on the basis of X-ray diffraction (XRD), infrared spectroscopy (IR), carbon, hydrogen, nitrogen (CHN) analysis, thermogravimetric (TG) analysis and differential thermal analysis (DTA) measurements. IR absorption bands indicate the mode of vibrations of different molecular groups present in LAHCl. TG-DTA analysis gives an idea about the thermal behaviour of LAHCl and ruled out the possibility of structural changes independent of mass changes.