Growth and characterization of 2-amino-5-bromopyridinium-4-hydroxybenzoate crystals for nonlinear optical and antioxidant applications

Abstract

Organic single crystals of 2-amino-5-bromopyridinium-4-hydroxybenzoate (2A5BPH) were grown by slow evaporation technique at room temperature using methanol as a solvent. Functional groups present in the synthesized compound were confirmed by FTIR spectral analysis. Single crystal X-ray diffraction (XRD) confirms that the crystal belongs to orthorhombic system with noncentrosymmetric space group Pna21. UV–visible spectrum shows that the crystal has lower cut off wave length of 388[Formula: see text]nm with an optical band gap of 2.9[Formula: see text]eV. The dielectric and photoconductivity studies are analyzed. The powder second harmonic generation (SHG) efficiency test and antioxidant studies along with quantum chemical calculations were also carried out. The compound is found to be 3 times more efficient in second harmonic signal generation than KDP. The crystal also significantly exhibits antioxidant activity against DPPH and OH radicals.