Semi-organic crystal of potassium 4-methyl benzene sulphonate (KOPT) was grown by slow evaporation solution growth technique. Structural parameters of the grown crystal were obtained by single-crystal X-ray diffraction analysis. It reveals that the crystal belongs to monoclinic system and crystallized in noncentrosymmetric space group P2 1 . The vibrational frequencies of corresponding functional groups in the compound were analysed by Fourier-transform infrared and FT-Raman spectroscopy. 1 H and 13 C NMR spectral analyses have been carried out to confirm the molecular structure of the grown crystal. The thermal properties of KOPT were evaluated by thermogravimetric analysis/differential scanning calorimetry measurements. Ultraviolet–Visible spectral studies revealed the cut-off wavelength, transparency and corresponding bandgap (4.5 eV) of KOPT crystal. The dielectric and mechanical characteristics were studied to test the KOPT crystal for nonlinear optical applications.

中文翻译：

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4-甲基苯磺酸钾的合成、结构、晶体生长、电学和机械性能

4-甲基苯磺酸钾（KOPT）的半有机晶体通过缓慢蒸发溶液生长技术生长。通过单晶X射线衍射分析获得生长晶体的结构参数。表明该晶体属于单斜晶系，在非中心对称空间群P2 1 中结晶。通过傅里叶变换红外光谱和FT-拉曼光谱分析了化合物中相应官能团的振动频率。已进行 1 H 和 13 C NMR 光谱分析以确认生长晶体的分子结构。KOPT 的热性能通过热重分析/差示扫描量热法测量进行评估。紫外-可见光谱研究揭示了截止波长、透明度和相应的带隙 (4. 5 eV) 的 KOPT 晶体。研究介电和机械特性以测试用于非线性光学应用的 KOPT 晶体。