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Single crystals of a new L-Lysine salt: L-Lysinium trifluoroacetate {abbreviated as LLyTFA;+ CF 3 COO -} were grown by slow evaporation of an aqueous solution at room temperature. The grown crystals were subjected to single crystal X-ray diffraction, FTIR and UV-Vis-NIR spectrum analyses. The UV-Vis-NIR spectrum shows that the absorption is very less in the whole of the region from ultraviolet to near IR. The Kurtz-Perry powder SHG measurement using a Nd:YAG laser of wavelength 1064nm confirms the frequency doubling of the crystal and its powder SHG efficiency was measured as d eff = 0.96 d eff (KDP).

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L-histidinium acetate dihydrate {abbreviated as LHAc; [C 6 , a new nonlinear optical (NLO) material has been grown from aqueous solution. The grown crystals were subjected to X-ray diffraction, Fourier transform infrared (FTIR) and FT-Raman analyses. Thermal studies have been carried out for its thermal stability. Optical behaviour such as UV-Vis-NIR spectrum and second harmonic generation (SHG) were also investigated. Its SHG efficiency was found as d eff = 2.2 d eff (KDP).