S. B. Dhas, J. Suresh, G. Bhagavannarayana, S. Natarajan
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引用次数: 9
摘要
采用L-组氨酸与三氟乙酸按1:1的化学计量比在水-乙醇介质中结晶了一种新型有机非线性光学材料L-组氨酸。单晶的x射线衍射分析表明，它们属于三斜体系，空间群P1，每个细胞有两个分子。后期参数为a = 5.1673(2) a, b = 8.8393(3) a, c = 12.4837(6) a，= 96.190(3)°，= 100.020(3)°，=102.010(3)°。分子通过氢键的三维网络连接在一起。用高分辨率x射线衍射研究了晶体的完美性。采用Kurtz和Perry方法测量了二次谐波产生效率。记录并研究了FTIR、UV-Vis-NIR光谱和TGA/DTA。同时进行了维氏显微硬度测定。
Growth and Characterization of a New Organic Non-Linear Optical (NLO) Material: L-Histidinium Trifluoroacetate
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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