In order to satisfy present day technological requirements, one has to search the new organic nonlinear optical (NLO) materials with good efficiency. In this article, the title compound (4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST)) belongs to the class of organic NLO materials, and it is one of the highest of the nonlinear materials among all the known NLO single crystals. In the present study, we have reported the synthesis, solubility, metastable zone width, and induction period of the DAST single crystal. The crystal has been grown by the slope nucleation technique by optimizing the growth conditions, and it has been characterized by different instrumentation methods. The crystal system and lattice constants were found from powder X-ray diffractometry (XRD). Nuclear magnetic resonance ( 13 C NMR) studies confirm the presence of functional groups. The crystalline perfection is moderately good as observed from the high-resolution X-ray diffractometry (HRXRD). A low-angle internal structural grain boundary was observed from this analysis, which seems to be formed by the segregation of solvent molecules at the boundary due to entrapment of solvent molecules during the growth process. Entrapment of solvent molecules in the crystalline matrix has been confirmed by differential scanning calorimetry (DSC). The Kurtz powder second-harmonic generation (SHG) reveals that the SHG efficiency of grown DAST is about 141 times that of urea. From the microhardness measurements, the Meyer's index and Young's modulus have been calculated.
The organic material 4-Ethoxybenzaldehyde-N-methyl 4-Stilbazolium Tosylate (EBST) is a new NLO material and new derivative in Stilbazolium Tosylate family. In this work we synthesized the EBST, the derivative of DAST. By slow evaporation method, we have grown the EBST crystal. Powder XRD confirms the crystalline property, the lattice parameters are calculated from single crystal XRD data and the molecular structure also revealed. The crystal system is found as monoclinic. The crystalline perfection is assessed by the high-resolution X-ray diffractometry. A single and reasonably sharp peak observed in the diffraction curve indicates that the quality of the crystal is quite good without having any internal structural grain boundaries. The FTIR and proton NMR study confirm the presence of functional groups. From the UV -Vis Far IR absorption spectra the good transparency is revealed. The Kurtz Perry SHG test confirms the NLO property of the EBST crystal grown and it is 11 times greater than urea. The melting point of the grown crystal is found to be 237°C from the DSC curve.
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