A new organic non-linear optical salt crystal 3-Nitro anilinium richloroacetate (NAT) has been synthesized and single crystals were grown by slow solvent evaporation solution growth technique at room temperature using methanol as the solvent. The ¹H and ¹³C NMR spectra were recorded to establish the molecular structure of the title salt. The crystal structure of NAT has been determined by single crystal XRD analysis and it belongs to monoclinic crystal system with noncentrosymmetric space group P2₁. Fourier transform infrared (FT-IR) spectral study has been carried out to confirm the various functional groups present. The UV-Vis-NIR transmittance spectrum was recorded in the range 200-2500nm, to find the optical transmittance window and lower cut off wavelength. The thermo gravimetric (TG) and differential thermal analyses (DTA) were carried out to establish the thermal stability of the title crystal. The second harmonic generation in the title complex was confirmed by the modified Kurtz-Perry powder test employing the Nd: YAG laser as the source for IR radiation.

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