Growth and spectroscopic characterization of a new organic nonlinear optical crystal: L-alaninium succinate

A novel organic nonlinear optical (NLO) material, l-alaninium succinate, was synthesized by the standard method. The synthesized material was purified by repeated recrystallization. Single crystals were grown by slow evaporation technique using water as solvent. The grown crystals were characterized by FT-IR, FT-NMR and UV-vis-NIR techniques. The second harmonic generation (SHG) from the material was confirmed using Nd:YAG laser which shows that LAS has 23% SHG efficiency of that of the standard KDP. The UV-vis-NIR transmittance was recorded in the range from 190 to 1100nm. In this study, the lower cut-off is shifted towards UV region (190nm) which shows that LAS has good transmittance in region from 190 to 1100nm and it makes LAS for SHG. Functional groups present in the grown crystal were identified using FT-IR spectrum which gives confirmation of NH(3)(+) ion in LAS. The chemical structure of l-alaninium succinate was established by FT-NMR technique.