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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).

The title compound, C6H10N3O2+·BF4−, crystallizes with one histidinium cation and one tetra­fluoro­borate anion in the asymmetric unit. The protonated cation and the deprotonated anion are linked through a number of inter­molecular N—H⋯O and N—H⋯F hydrogen bonds, forming a three‐dimensional network.

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