Newly identified organic single crystals of 8-hydroyquinolinium 2-chloro 4-nitrobenzoate (HQ2ClNB) were grown by the slow evaporation solution growth technique (SEST) using methanol as a solvent. It crystallizes in monoclinic crystal system with a space group of P21/c. Crystalline nature and phases were confirmed by powder X-ray diffraction (XRD). The existence of various functional groups in the molecule was identified using the Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) technique. Optical transmission window and lower cut-off wavelength of the HQ2ClNB crystal have been evaluated by UV–Visible–NIR studies. Dielectric and photoconductivity studies were recorded. Third-order nonlinear optical susceptibility [Formula: see text] of the crystals were evaluated by [Formula: see text]-scan studies.

中文翻译：

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喹啉基有机晶体的理化和三阶非线性光学研究

新鉴定的 8-羟基喹啉 2-氯 4-硝基苯甲酸酯 (HQ2ClNB) 有机单晶通过使用甲醇作为溶剂的慢速蒸发溶液生长技术 (SEST) 生长。结晶为单斜晶系，空间群为P21/c。通过粉末 X 射线衍射 (XRD) 确认结晶性质和相。使用傅里叶变换红外 (FTIR) 和核磁共振 (NMR) 技术确定分子中各种官能团的存在。HQ2ClNB 晶体的光传输窗口和较低的截止波长已通过紫外-可见-近红外研究进行了评估。记录介电和光电导研究。通过[公式：参见文本]-扫描研究评估晶体的三阶非线性光学磁化率[公式：参见文本]。