Department of Physics, Periyar University, Salem 636011, Tamilnadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Dec;74(5):1160-4. doi: 10.1016/j.saa.2009.09.026. Epub 2009 Sep 19.
Glycine usually crystallizes as the metastable alpha-polymorph from pure aqueous solution. The polymorph, gamma-form of glycine can be crystallized only in presence of additive. In the present work, gamma-glycine has been crystallized by using potassium chloride (KCl) as additive at ambient temperature by solvent evaporation method. The form of crystallization is confirmed by X-ray powder diffraction method. Spectroscopic and thermal studies have been carried out for analyzing the presence of functional groups, thermal stability and decomposition of the sample. The results indicate that the KCl is doped into the gamma-glycine. The optical transparency of the gamma-glycine in the ultraviolet-visible region has been studied by recording the optical transmission spectrum. Second harmonic generation (SHG) conversion efficiency has been estimated as 120 mV and the output power by the crystal is less than that of potassium dihydrogen phosphate crystal.
甘氨酸通常从纯水溶液中结晶为亚稳的α-多晶型物。多晶型物γ-甘氨酸只能在添加剂的存在下结晶。在本工作中，通过溶剂蒸发法，在环境温度下使用氯化钾（KCl）作为添加剂来结晶γ-甘氨酸。通过 X 射线粉末衍射法确定结晶形式。对样品进行了光谱和热学研究，以分析官能团的存在、热稳定性和分解。结果表明，KCl 掺杂到γ-甘氨酸中。通过记录光学透射光谱研究了γ-甘氨酸在紫外可见光区的透光率。估计 SHG 转换效率为 120 mV，晶体的输出功率小于磷酸二氢钾晶体的输出功率。
