Synthesis and Characterization of Non-Linear Optical Crystal of Manganese Mercury Thiocyanate Glycol Monomethyl Ether

The design and synthesis of organic nonlinear optical (NLO) crystals are a promising area of current research in materials science. Organic materials are found to possess better non linear optical properties when compared to inorganic materials. Recently, there has been a widespread interest in the metal-organic coordination compounds, which are a combination of metal and organic ligands, having exciting NLO properties. Non-linear optical single crystals of Manganese mercury thiocyanate glycol monomethyl ether (MMTG) were grown from a mixed solvent of glycol monomethyl ether and water by slow evaporation method. Optimum conditions for the growth at ambient temperature were found by investigating different growth parameters. The percentage of optical transmittance by the grown crystal was ascertained by a UV-visible spectral study. The growth features of MMTG crystal was observed by Field Emission Scanning Electron Microscopy technique and Epifluorescence studies for the same were carried out for the first time thus revealing the excitation of the sample around 545 nm. Dielectric measurements on MMTG single crystal were carried out for various frequencies at different temperatures.

有机非线性光学（Nonlinear Optical, NLO）晶体的设计与合成是当前材料科学领域极具潜力的研究热点。研究表明，相较于无机材料，有机材料具备更优异的非线性光学性能。近年来，兼具金属与有机配体特性且展现出优异非线性光学性能的金属有机配位化合物受到了广泛关注。硫氰酸锰汞乙二醇单甲醚（MMTG）非线性光学单晶通过乙二醇单甲醚与水的混合溶剂，采用缓慢蒸发法制备得到。通过探究不同生长参数，确定了该晶体在室温下生长的最优工艺条件。借助紫外-可见光谱测试，测定了该单晶的光学透光率百分比。采用场发射扫描电子显微镜（Field Emission Scanning Electron Microscopy, FESEM）观察了MMTG晶体的生长形貌，并首次开展了该晶体的落射荧光测试，结果显示样品在约545 nm波长处存在激发现象。针对MMTG单晶，在不同温度与频率条件下开展了介电性能测试。