Synthesis and controllable growth of 2 – methylquinolinium L- malate single crystal for optical and spectroscopic applications

A chemical synthesis was used to synthesize a nonlinear optical crystal composed of 2-methylquinolinium and L-malate (MQLM). The Slow Evaporation method was utilized to generate this crystal from an aqueous solution. The crystal was further analyzed using the single crystal X-ray diffraction method to establish its lattice characteristics. FT-IR spectroscopy quantifies the absorption of light by the different bonds inside a vibrating molecule. The functional group identified in MQLM was detected by FT-Raman analysis. The MQLM crystal has a unique UV–Visible absorption spectrum, which facilitates compound identification and determination of its optical properties. The crystal's transmittance spectrum in the ultraviolet–visible (UV–Vis) region has been acquired. A fluorescence analysis was conducted within the wavelength range of 300–900 nm. The recorded fluorescence spectrum exhibits a prominent peak at a wavelength of 401 nm. Upon doing the Vickers microhardness test, it was evident that the crystal exhibited a low level of mechanical hardness, classifying it as a soft material. The verification of the frequency doubling property of nonlinear optical (NLO) crystals was accomplished through investigations on second harmonic generation (SHG). The material's thermal behavior was investigated utilizing differential scanning calorimetry and thermogravimetry analyses. Nanocrystalline cellulose–based biomedical materials are widely utilized in medical implants, drug delivery systems, wound healing, tissue engineering, cardiovascular disease, and antibacterial/antimicrobial activities. The promising features of the crystal leads towards application in the design of nonlinear optical devices and light-controlled electrical switches.