Experimental and theoretical characterization of the 2-(4-bromobenzyl)-5-ethylsulphonyl-1,3-benzoxazole


Zeyrek C. T., ÜNVER H., ARPACI Ö., POLAT K., Ocak İskeleli N., Yildiz M.

JOURNAL OF MOLECULAR STRUCTURE, vol.1081, pp.22-37, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1081
  • Publication Date: 2015
  • Doi Number: 10.1016/j.molstruc.2014.10.001
  • Journal Name: JOURNAL OF MOLECULAR STRUCTURE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.22-37
  • Keywords: Benzoxazoles, PES scan, Density functional theory, Spectroscopy, Nonlinear optical effects, Organic light-emitting diode, NONLINEAR-OPTICAL PROPERTIES, AB-INITIO CALCULATIONS, DENSITY-FUNCTIONAL THERMOCHEMISTRY, SET MODEL CHEMISTRY, FT-RAMAN, NBO ANALYSIS, HOMO-LUMO, SPECTROSCOPIC PROPERTIES, HETEROCYCLIC-COMPOUNDS, VIBRATIONAL-SPECTRA
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

Synthesis, crystal structure, Fourier transform infrared spectroscopy (FT-IR) and quantum mechanical studies of the 2-(4-bromobenzyl)-5-ethylsulphonyl-1,3-benzoxazole (C16H14NO3SBr) have been reported. The molecular structure obtained from X-ray single-crystal analysis of the investigated compound in the ground state has been compared using Hartree-Fock (HF) and density functional theory (DFT) with the functional B3LYP and B1B95 using the 6-311++G(d,p) basis set. In addition to the optimized geometrical structures, atomic charges, molecular electrostatic potential (MEP), natural bond orbital (NBO), nonlinear optical (NLO) effects and thermodynamic properties of the compound have been investigated by using DFT. The potential energy surface (PES) scans about four important torsion angles are performed by using B3LYP/6-311++G(d,p) level of theoretical approximation for the compound. The experimental (FT-IR) and calculated vibrational frequencies (using DFT) of the title compound have been compared. The total molecular dipole moment (mu), linear polarisability (alpha), and the first-order hyperpolarisability (beta) were predicted by using DFT with different basis sets 6-31G(d), 6-31+G(d,p), 6-31++G(d,p), 6-311+G(d) and 6-311++G(d,p) for investigating the effects of basis sets on the NLO properties. Our computational results yield that beta(tot) for the title compound is greater than those of urea. The standard thermodynamic functions were obtained for the title compound with the temperature ranging from 200 to 450 K. (C) 2014 Elsevier B.V. All rights reserved.