Growth and characterization of Piperazinium adipate: A third order NLO single crystal

Good quality single crystals of Piperazinium adipate were grown from aqueous solution at room temperature by slow solvent evaporation method. The crystal belongs to triclinic crystal system with centrosymmetric space group P1¯. Various functional groups present in the title compound were identified through FTIR, FTRaman and FTNMR spectral analyses. The UV-vis absorption studies of the crystal showed that the crystal is highly transparent in the entire visible range above 210 nm. The PL emission spectrum recorded at an excitation wavelength of 245 nm depicted a broad blue emission centered at 475 nm. The crystal is thermally stable upto 215 °C as found by TG-DTA and DSC analyses. The third-order nonlinear optical behavior of the title crystal was studied using Z-scan measurements. The negative nonlinear refractive index (n2) of the crystal suggested self-defocusing effect. The nonlinear absorption coefficient (β) and third order nonlinear optical susceptibility (χ(3)) were also calculated from the measurements.