The Investigation of Spectroscopic and Electronic Properties of 3-Ethyl-4-(4-cinnamoyloxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-one Compound Using Density Functional Theory and Hartree-Fock Basis Sets

Abstract

In this study, we reported a combined experimental and theoretical study on 3-n-propyl-4-(3-cinnamoyloxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-one compound. The title compound was prepared and characterized by Uv-Vis, FT-IR spectra, 1H and 13C NMR. UV-visible absorption spectra and the stimulation contributions in UV-visible transitions were obtained with TD-DFT/B3LYP and TD-FF methods and 6-311G(d) polarizer set based on optimized structure. Calculated absorption wavelengths (λ), oscillator power (f) and excitation energies were compared with experimental values. The calculated IR data of compound were calculated in gas phase by using of 6-31G(d) basis set of B3LYP and HF methods and are multiplied with appropriate scala factors. Theoretical infrared spectrums are formed from the data obtained according to B3LYP method. In the identification of calculated IR data was used the veda4f program. The molecular geometry, gauge including atomic orbital (GIAO), Experimental and theoretical values were inserted into the graphic according to equitation of δexp=a+b. δ calc. The standard error values were found via SigmaPlot program with regression coefficient of a and b constants. Obtained results indicate that there is a good agreement between the experimental and theoretical data. Also, HOMO-LUMO analyses properties, Mulliken’s atomic charges, dipole moment and total energy of the title compound in the ground state were investigated by using Hartree-Fock (HF) and density functional theory (DFT/B3LYP) methods with 6-31G(d) basic set.