Synthesis, growth, crystal structure, spectral, thermal, mechanical and optical studies of stilbazolium derivative single crystal: 2-[2-(4-Diethylamino-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate (DESNS)

•DESNS single crystals with size of 15 × 10 × 9 mm3 were firstly grown by slow evaporation method.•The crystal structure of DESNS for the first time in the literature.•UV–Vis–NIR spectral analysis shows that grown crystal has good transparency window from 476 to 1100 nm.•TG/DTA studies show that the compound is stable up to its melting point at 226 °C.•Mechanical studies establish that the crystal is belongs to the soft material category.

Single crystals of organic optical material, 2-[2-(4-Diethylamino-phenyl)-vinyl]-1-methyl-pyridinium naphthalene-2-sulfonate (DESNS) (15 × 10 × 9 mm3) were grown by a slow evaporation technique at room temperature using methanol–acetonitrile (1:1) mixed solvent. The molecular structure of the grown crystal was confirmed by single crystal X-ray diffraction studies, and it belongs to orthorhombic system with space group Pbca and the unit cell dimentions are a = 11.5148(3) Å, b = 15.4352(4) Å, c = 27.2187(7) Å, Z = 8. The crystallinity of the title crystals was confirmed from the powder XRD pattern. The presence of functional groups of the title crystal was confirmed from the FTIR spectral studies. The transparent range and cut off wavelength of the grown crystal was studied by the UV–Vis–NIR spectroscopic analysis. The mechanical properties and thermal behavior of the grown crystals were studied from Vickers microhardness test and TG/DTA.

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