Kareem, Rebaz ObaidKebiroğlu, Mehmet HanifiHamad, Othman AbdulrahmanKaygili, OmerBulut, Niyazi2026-06-192026-06-1920232676-7279https://doi.org/10.22034/crl.2023.421325.1253https://hdl.handle.net/20.500.12899/4926This study employs Density Functional Theory (DFT) methodology to comprehensively investigate the structural and physicochemical characteristics of epinephrine, a molecule of physiological relevance. By employing DFT approaches, a more precise description of epinephrine's structure and properties is achieved compared to prior studies. A detailed examination of epinephrine's structure and various properties, such as the Highest Occupied Molecular Orbital (HOMO), Lowest Unoccupied Molecular Orbital (LUMO), Band Gap (BG), Density of States (DOS), Fourier-Transform Infrared Spectroscopy (FT-IR), Ultraviolet (UV) absorption, and Natural Bond Orbital (NBO) analysis. Furthermore, we explore non-covalent interactions (NCI) through the examination of Reduced Density Gradient (RDG) and Molecular Electrostatic Potential (MEP) maps. Incorporating FT-IR results, we delve into the vibrational properties of epinephrine, highlighting C-H vibrations at 3700, 3176.20, and 2986.14 cm-1, along with specific vibrational modes of the benzene ring at 1558.43 and 1461.14 cm-1. Additionally, we provide a comprehensive analysis of epinephrine's thermochemical properties at temperatures ranging from 100 to 200 K under constant pressure conditions (1 atm), including optical transitions. This comprehensive investigation enhances our understanding of epinephrine's structure and properties, paving the way for a more profound comprehension of its biological and pharmacological significance. © 2023, Iranian Chemical Science and Technologies Association. All rights reserved.eninfo:eu-repo/semantics/closedAccessEpinephrineNciOptical PropertiesPhysicochemicalRdgThermochemistryReview10.22034/crl.2023.421325.1253644154272-s2.0-85183675483Q3