Investigating the Vibrational, Optical, Impedance, Electrical, and Thermal Properties of l-Histidine Acetate Dihydrate Crystals

This investigation used the slow evaporation method to synthesize the amino acid derivative l-histidine acetate dihydrate (LHADH) from a water-based solution. The single-crystal X-ray diffraction (SCXRD) study revealed that the LHADH crystallized into the triclinic crystal form. FTIR and Raman spectral studies identified the vibrational modes and functional groups of the LHADH. UV–visible analysis was used to measure the optical absorption of the produced crystal. The optical attributes were assessed, including its bandgap, optical conductivity, refractive index, and extinction coefficient. The second harmonic generation ability of LHADH was evaluated to be 0.93 times that of KDP. The impedance and electric modulus features of the LHADH were ascertained between 100 Hz and 5 MHz region at varying temperatures. The electric modulus was used to study the relaxation process of the LHADH. The appearance of a semicircle arc in the complex modulus spectra at various fixed temperatures indicates the single-phase nature of the compound. Jonscher power was applied to describe the LHADH crystal’s electrical conductance process. Thermogravimetry and differential thermal analysis (TG–DTA) measurements were used to evaluate the thermal properties of LHADH. The LHADH crystals are suitable for optoelectronic uses because of their significant optical, SHG, electrical, thermal, and impedance parameters.