title: Vibrational spectroscopic study and NBO analysis on tranexamic acid using DFT method.
abstract: In this work, we reported the vibrational spectra of tranexamic acid (TA) by experimental and quantum chemical calculation. The solid phase FT-Raman and FT-IR spectra of the title compound were recorded in the region 4000 cm(-1) to 100 cm(-1) and 4000 cm(-1) to 400 cm(-1) respectively. The molecular geometry, harmonic vibrational frequencies and bonding features of TA in the ground state have been calculated by using density functional theory (DFT) B3LYP method with standard 6-31G(d,p) basis set. The scaled theoretical wavenumber showed very good agreement with the experimental values. The vibrational assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes. Stability of the molecule, arising from hyperconjugative interactions and charge delocalization, has been analyzed using Natural Bond Orbital (NBO) analysis. The results show that ED in the σ(*) and π(*) antibonding orbitals and second order delocalization energies E(2) confirm the occurrence of intramolecular charge transfer (ICT) within the molecule. The electrostatic potential mapped onto an isodensity surface has been obtained. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. The thermodynamic properties (heat capacity, entropy, and enthalpy) of the title compound at different temperatures were calculated in gas phase.
authors.affiliation: Department of Physics, Sri Venkateswara College of Engg, Sriperumbudur 602 105, India. Electronic address: muthu@svce.ac.in.
authors.forename: S
authors.initials: S
authors.lastname: Muthu
authors.affiliation: Department of Physics, Pallavan College of Engg, Kanchipuram 631 502, India; Research and Development Center, Bharathiar University, Coimbatore 641 046, India.
authors.forename: A
authors.initials: A
authors.lastname: Prabhakaran
mesh_terms: D008958:Models, Molecular; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D014148:Tranexamic Acid / Q000737:chemistry*
chemical_list: D014148:Tranexamic Acid
keywords: DFT; FT-IR; FT-Raman; HOMO; LUMO; NBO