Crystal Growth, Mechanical, Thermal and Third Order NLO Characteristics of a Single Crystal of 4‐nitroaniline 4‐aminopyridine for Optoelectronics Applications

Abstract The slow evaporation process is utilized to create an elevated quality grown crystal of 4‐nitroaniline 4‐aminopyridine (4NA4AP). A single crystal XRD measurement reveals that the crystal system has a monoclinic formation corresponding to the centro‐symmetric space group P21/c. The powder XRD patterns confirm the generated crystal's high degree of crystallinity. In order to identify the distinct forms of vibration caused by the diverse functional groups contained in the crystal. UV–vis–NIR spectrometer display that the lower cut‐off wavelength is 260 nm and bandgap energy value is 4.59 eV. The emission of wavelength 744 nm reveals near infrared color, examined with the aid of fluorescence investigations. The mechanical characteristics are strong‐minded by a micro‐hardness tester, which falls under the type of soft materials. TG‐DSC studies are utilized to investigate the thermal stability of 4NA4AP crystal, and the DSC curve shows the crystal melting point at 340 °C. The molecular arrangement of the produced crystals is well‐known through 1 H and 13 C NMR spectroscopy. Particle size is examined by utilizing the DLS study. Make use of z‐scan techniques, the third order optical property of the 4NA4AP crystal is examined. The developed 4NA4AP NLO single crystal is recommended for optoelectronic LEDs applications.