Synthesis, crystal structure, optical, spectroscopic, and self-defocusing properties of novel 2-amino 6-methyl pyridinium adipate adipic acid (2A6MPAA) single crystals for third harmonic nonlinear optical applications

2-amino 6-methyl pyridinium adipate adipic acid (2A6MPAA) crystallized with a strong optical third order nonlinearity. This crystal was created using the standard slow evaporation solution growth method. The features of the produced crystals were analyzed using a variety of characterization methods. The structure of the crystal was established using the single crystal X-ray diffraction (SXRD) method. Powder X-ray diffraction (PXRD) was used to validate the crystallinity of 2-amino 6-methyl pyridinium adipate adipic acid. The compounds' numerous functional groups were confirmed by the use of FTIR analysis. Adipic acid crystal with 2-amino- 6-methyl pyridinium adipate has a decreased UV cut-off wavelength and a high optical transmittance over the whole visible range, according to studies employing UV-Vis spectrometers. The developed 2A6MPAA crystal's third order susceptibility, nonlinear refraction, and nonlinear absorption coefficient were assessed using the Z-scan technique. Additionally, this publication concentrated on theoretical investigations of a crystal's traditional nucleation dynamics. Vickers microhardness analysis was utilised to conclusively evaluate the mechanical stability of the growing crystal, and the Hays-Kendall technique proved effective in explaining the proportional stability model (PSRM) and the indentation size effect (ISE). For the as-grown 2A6MPAA crystal, the piezoelectric coefficients (d33) were additionally premediated.