Studies on the synthesis, spectral, optical and thermal properties of l-Valine Zinc Sulphate: An organic inorganic hybrid nonlinear optical crystal

Nonlinear optical (NLO) organic inorganic hybrid l-Valine Zinc Sulphate (LVZS) was synthesized and single crystals were obtained from saturated aqueous solution by slow evaporation method at 36 °C using a constant temperature bath (CTB) with an accuracy of ±0.01 °C. This crystal is reported with its characterization by single crystal and powder XRD, FTIR, UV–Vis-NIR, TG/DTA analysis and SHG test. Single crystal XRD study reveals that LVZS crystallizes in monoclinic system with the lattice constants a = 9.969(3) Å, b = 7.238(3) Å, c = 24.334(9) Å and cell volume is 1736.00 Å3. Sharp peaks observed in powder X-ray diffraction studies confirm the high degree of crystallinity of grown crystal. The incorporation of sulphate ion with l-valine is confirmed by FTIR spectrum in LVZS crystal. A remarkable increase in optical transparency has been observed in LVZS when compared to l-valine and zinc sulphate heptahydrate Thermal properties of LVZS have been reported by using TG/DTA analysis. Kurtz powder second harmonic generation (SHG) test confirms NLO property of the crystal and SHG efficiency of LVZS was found to be 1.34 times more than pure l-valine.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► l-Valine Zinc Sulphate have been grown successfully from l-valine and Zinc sulphate. ► Grown crystal have better thermal properties. ► Transmission spectrum shows that it can be used as good NLO material. ► NLO efficiency of the new crystal is 34% higher than pure l-valine.