A conventional method was adopted to prepare pure ninhydrin (NH) and nickel doped ninhydrin (N1NH) single crystals. The present investigation focused on various properties of as grown NH and NINH crystals. Monoclinic crystal structure with P2₁ space group which is attractive phenomena were noticed in structural mode of grown NH and NINH crystals. Various vibrations of functional groups related to NH and nickel doped NINH crystals were assigned from Fourier-transform infrared peaks of good resolution. Energy-dispersive X-ray spectrum presents the percentage of carbon, oxygen and nickel occurs in the sample. The strength of the samples have deliberated with the help of Vicker’s microhardness tester. The decomposition point of both NH and N1NH crystals has been measured by thermal analysis. The dielectric constant of both NH and N1NH crystals was also determined. Green emission which denotes second harmonic generation (SHG) process for the samples generally confirms the nonlinear optical (NLO) activity of the NH and N1NH crystals and it has been tested successfully based on the technique of Kurtz-Perry. The SHG efficiency values of NH and N1NH samples are comparable with KDP which has been used as reference sample as it is being used commercially. Basically, NH and NINH crystal samples were used for many medical applications. Therefore, the antifungal activity was also focused for investigation against two famous fungi like Aspergillus niger, Aspergillus flavus.

中文翻译：

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纯和掺镍茚三酮非线性单晶的结构、机械、热、光学和抗真菌性能

采用常规方法制备纯茚三酮（NH）和掺镍茚三酮（N1NH）单晶。目前的研究集中在生长的 NH 和 NINH 晶体的各种特性。具有 P2 _{1 的}单斜晶体结构在生长的 NH 和 NINH 晶体的结构模式中注意到了有吸引力的空间群。与 NH 和掺镍 NINH 晶体相关的官能团的各种振动是从具有良好分辨率的傅立叶变换红外峰中确定的。能量色散 X 射线光谱显示样品中碳、氧和镍的百分比。在 Vicker 显微硬度计的帮助下，对样品的强度进行了审议。NH 和 N1NH 晶体的分解点已通过热分析测量。还测定了 NH 和 N1NH 晶体的介电​​常数。表示样品的二次谐波产生 (SHG) 过程的绿色发射通常证实了 NH 和 N1NH 晶体的非线性光学 (NLO) 活性，并已基于 Kurtz-Perry 技术成功测试。NH 和 N1NH 样品的 SHG 效率值与 KDP 相当，KDP 在商业上用作参考样品。基本上，NH 和 NINH 晶体样品用于许多医疗应用。因此，抗真菌活性也被重点研究对两种著名真菌如黑曲霉，黄曲霉。