Exploring Noncovalent Interactions of Thiophene-2-Car¬boxylic Acid in Ethanol Via Vibrational Spectroscopy and DFT Calculations

Authors

  • A. Jumabaev Department of Optics and Spectroscopy, Samarkand State University
  • B. Khudaykulov Department of Optics and Spectroscopy, Samarkand State University
  • S.-J. Koyambo-Konzapa Laboratoire Mati`ere, Energie et Rayonnement (LAMER), Universit´e de Bangui
  • U. Holikulov Department of Optics and Spectroscopy, Samarkand State University
  • H. Hushvaktov Department of Optics and Spectroscopy, Samarkand State University
  • A. Absanov Department of Optics and Spectroscopy, Samarkand State University
  • I. Doroshenko Department of Optics and Spectroscopy, Samarkand State University, Taras Shevchenko National University of Kyiv

DOI:

https://doi.org/10.15407/ujpe70.6.391

Keywords:

vibrational spectroscopy, DFT calculation, intermolecular interaction, topological parameters

Abstract

The spectral bands of pure 2-thiophene carboxylic acid (TCA) and its solution in ethanol (EtOH) are investigated over a wide range using vibrational spectroscopy (Raman and FTIR). In the TCA solution with EtOH, the maxima of the C=O, O–H, C–H stretching, and C–H breathing vibration bands show either a redshift or a blueshift. This indicates that H-bonding, van der Waals interactions, and hyper-conjugation interactions are likely in solutions. MEPS, HOMO and LUMO, AIM, NCI, RDG, ELF, and LOL analyses are performed using a quantum chemical computational approach based on density functional theory (DFT). The MEPS map was used to visually show the charge distribution in the complexes and determine charge-dependent characteristics. Frontier molecular orbitals (FMO) have been utilized to explain chemical reactivity of TCA, its molecular stability, as well as electrical and optical properties. According to AIM, NCI, and RDG analysis, TCA and TCA-EtOH complexes mainly have moderate H-bonding.

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Published

2025-06-28

Issue

Section

Physics of liquids and liquid systems, biophysics and medical physics

How to Cite

Exploring Noncovalent Interactions of Thiophene-2-Car¬boxylic Acid in Ethanol Via Vibrational Spectroscopy and DFT Calculations. (2025). Ukrainian Journal of Physics, 70(6), 391. https://doi.org/10.15407/ujpe70.6.391

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