ABSTRACT Organic single crystals of 4‐methylanilinium trichloroacetate (4MATCA), exhibiting nonlinear optical properties, were grown from a methanol solvent by the slow evaporation solution growth method at ambient temperature. The crystallographic data of the developed crystal were gathered via single‐crystal X‐ray diffraction. The intermolecular interactions within the crystal lattice were quantitatively visualized using Hirshfeld surface analysis. FTIR spectroscopy provides detailed insights into the molecular structure by probing the vibrational modes associated with specific functional groups. Optical properties have been examined through UV–vis and fluorescence analysis. Using the thermogravimetric and differential thermal analysis, the thermal stability of the 4MATCA crystal has been found to be 130°C, and its mechanical stability was quantified by the Vickers microhardness test. Furthermore, SEM and EDAX analysis were performed to depict the surface morphology and to ensure the elemental constituents within the crystal, respectively. LDT measurements were employed to ascertain the maximum tolerance of the crystal to endure the laser‐induced damage, yielding a value of 1 GW/cm 2 . Third‐order NLO behaviour of the 4MATCA organic crystal was assessed using the Z‐scan approach, revealing a notable nonlinear susceptibility value of 5.488 × 10 −6 esu.
D et al. (Sun,) studied this question.