Growth, structural, thermal, linear and nonlinear optical and laser damage threshold studies of Picolinium tartrate monohydrate single crystals

Picolinium tartrate monohydrate (PTM), a novel organic nonlinear optical material was synthesized and bulk crystals were grown from aqueous solution by slow cooling technique. The cell parameters of the grown crystal were found by single and powder X-ray diffraction analyses. The crystalline perfection of the grown crystals has been analyzed by high-resolution X-ray diffraction (HRXRD) rocking curve measurements. The presence of functional groups in the grown crystal was identified by FTIR and FT-Raman spectral analyses. UV-Vis spectral studies reveal PTM crystals are transparent in the wavelength region of 295-1100 nm. The thermal characteristics of PTM were analyzed by TGA/DTA studies. The dielectric and mechanical behaviours of PTM crystals were investigated. Dislocation density was estimated to be 2.89 x 10(3) cm(-2) on the fiat-surface of PTM crystals from the etching studies. The laser induced surface damage threshold for the grown crystal was measured using Nd:YAG laser. Its second harmonic generation relative efficiency was measured by Kurtz and Perry powder technique and was observed to be comparable with KDP crystal

4-Methylpyridinium 4-hydroxybenzoate

In the crystal structure of the title salt, C6H8N+·C7H5O3−, the anions and cations are linked by classical N—H...O hydrogen bonds. The anions are connected by pairs of C—H...O hydrogen bonds into inversion dimers and further linked by classical O—H...O hydrogen bonds. Weak π–π interactions [centroid–centroid distances = 3.740 (3) and 3.855 (3) Å] also occur. The dihedral angle between the CO2− group and the benzene ring to which it is attached is 20.95 (8)°

Studies on the growth, thermal and optical properties of 4-aminopyridinium p-aminobenzoate dihydrate single crystals

4-aminopyridinium p-aminobenzoate dihydrate (4APAB) compound was synthesized successfully and single crystals were grown by slow evaporation solution growth technique. Single crystal X-ray diffraction study was conducted to evaluate the cell parameters of grown crystal. The crystalline perfection of 4APAB crystal was assessed by HRXRD studies. Thermal studies revealed the thermal stability of grown crystal up to 126 degrees C. The optical transmittance window and lower cut-off wavelength of 4APAB crystal were estimated by using UV-vis-NIR studies. The second harmonic efficiency of 4APAB was measured by powder test using Nd:YAG laser radiation. The dielectric tensor studies revealed that 4APAB crystal shows normal dielectric behavior. The single and multiple shots laser damage threshold values of grown crystal were measured