title: Use of vibrational spectroscopy to study 4-benzyl-3-(thiophen-2-yl)-4,5-dihydro-1H-1,2,4-triazole-5-thione: A combined theoretical and experimental approach.
abstract: In this study, the experimental and theoretical vibrational frequencies of a newly synthesized potential anti-inflammatory agent namely, 4-benzyl-3-(thiophen-2-yl)-4,5-dihydro-1H-1,2,4-triazole-5-thione have been investigated. The experimental FT-IR (4000-400cm(-1)) and Laser-Raman spectra (4000-100cm(-1)) of the molecule in solid phase have been recorded. The theoretical vibrational frequencies and the optimized geometric parameters (bond lengths, bond angles and dihedral angles) have been calculated using density functional theory methods (DFT/B3LYP: Becke, 3-parameter, Lee-Yang-Parr and DFT/M06-2X: the highly parameterized, empirical exchange correlation function) with 6-311++G(d,p) basis set by Gaussian 09W software, for the first time. The assignments of the vibrational frequencies have been done by potential energy distribution (PED) analysis using VEDA 4 software program. The theoretical optimized geometric parameters and vibrational frequencies have been found to be in good agreement with the corresponding experimental data and results in the literature. In addition, the highest occupied molecular orbital (HOMO) energy, the lowest unoccupied molecular orbital (LUMO) energy and the other related molecular energy values of the compound have been investigated using the same theoretical calculations.
authors.affiliation: Department of Physics, Faculty of Art & Sciences, Bozok University, Yozgat 66100, Turkey; Sorgun Vocational School, Bozok University, Yozgat 66100, Turkey. Electronic address: yusufsert1984@gmail.com.
authors.forename: Yusuf
authors.initials: Y
authors.lastname: Sert
authors.affiliation: Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Ali A
authors.initials: AA
authors.lastname: El-Emam
authors.affiliation: Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia.
authors.forename: Ebtehal S
authors.initials: ES
authors.lastname: Al-Abdullah
authors.affiliation: Department of Pharmaceutical Chemistry, College of Pharmacy, Salman bin Abdulaziz University, Alkharj 11942, Saudi Arabia.
authors.forename: Abdul-Malek S
authors.initials: AM
authors.lastname: Al-Tamimi
authors.affiliation: Department of Physics, Faculty of Art & Sciences, Erzincan University, Erzincan 24100, Turkey.
authors.forename: Cağrı
authors.initials: C
authors.lastname: Cırak
authors.affiliation: Department of Physics, Faculty of Art & Sciences, Süleyman Demirel University, Isparta 32100, Turkey.
authors.forename: Fatih
authors.initials: F
authors.lastname: Ucun
mesh_terms: D008958:Models, Molecular; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013871:Thiones / Q000737:chemistry*; D013876:Thiophenes / Q000737:chemistry; D014230:Triazoles / Q000737:chemistry*
chemical_list: D013871:Thiones; D013876:Thiophenes; D014230:Triazoles; C045575:1,2,4-triazole
keywords: 1,2,4-Triazole; FT-IR spectra; Laser-Raman spectra; Vibrational study