Krishnakumar V, Nagalakshmi R
Department of Physics, Periyar University, Salem, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2007 Nov;68(3):443-53. doi: 10.1016/j.saa.2006.11.049. Epub 2006 Dec 15.
This paper presents the synthesis and crystal growth of optically non-linear semi-organic crystal potassiumtetrakisthioureabromide (KTTB) using water and a mixture of acetone and water (1:1) by slow evaporation of aqueous solution at room temperature. The solubility has been determined in both the solvents at various temperatures. The compound crystallizes in non-centrosymmetric space group P41. The crystalline perfection of the grown crystals has been analysed by high-resolution X-ray diffraction measurements. The IR and polarized Raman spectra have been interpreted using both the factor group analysis. The results of the correlation field splitting of the thiourea internal vibrations are discussed. The optical characterization of the crystal shows the cut off wavelength near the UV region. Also the crystal shows good propensity to emit second harmonic generation of Nd:YAG laser.
本文介绍了通过在室温下缓慢蒸发水溶液，利用水以及丙酮与水的混合物（1:1）合成和晶体生长光学非线性半有机晶体四硫脲溴化钾（KTTB）的方法。已测定该化合物在两种溶剂中不同温度下的溶解度。该化合物结晶于非中心对称空间群P41。通过高分辨率X射线衍射测量分析了生长晶体的结晶完整性。利用因子群分析对红外光谱和偏振拉曼光谱进行了解释。讨论了硫脲内部振动的相关场分裂结果。晶体的光学特性表明其截止波长接近紫外区域。此外，该晶体表现出良好的产生Nd:YAG激光二次谐波的倾向。
