4.6 Article

FT-IR, FT-Raman, UV-Vis, NMR and structural studies of carquejyl acetate, a distinctive component of the essential oil from Baccharis trimera (less.) DC. (Asteraceae)

Journal

JOURNAL OF MOLECULAR STRUCTURE
Volume 1177, Issue -, Pages 499-510

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2018.10.010

Keywords

Carquejyl acetate; Baccharis trimera; Vibrational spectra; Molecular structure; Force field; DFT calculations

Funding

  1. CIUNT Project (Consejo de Investigaciones, Universidad Nacional de Tucuman) [51/D608]
  2. CONICET (ConsejoNacional de Investigaciones Cientificas y Tecnicas)
  3. Agencia Nacional de Investigacion e Innovacion (ANII-Uruguay) [POS 2011 1 3332, POS NAC 2013 1 11316]
  4. Universidad Nacional de Tucuman (PEEP Program)

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Carquejyl acetate (CA), the main component of the essential oil from Baccharis trimera was isolated and characterized by using Fourier Transform infrared (FT-IR) and Raman (FT-Raman), Ultraviolet-Visible (UV-Visible), Electronic Circular Dichroism (ECD), Mass, Hydrogen and Carbon Nuclear Magnetic Resonance (H-1- and C-13 NMR) and 2D H-1-H-1 gCOSY, H-1-(13)CgHSQC,H- 1-(13)CgHMBC spectroscopies. Two conformers were found in the potential energy surface (PES) for CA in gas and aqueous solution phases by using the hybrid B3LVP method with the 6-31G* and 6-311++G** basis sets and, only one of them, C2, was the most stable and with higher populations in both phases. Natural bond orbital (NBO) studies evidence the high stability of CA as compared with carquejol while atoms in molecules (AIM) analyses reveals the different characteristics of the H bonds formed showing CA higher topological properties. The gap values suggest that carquejol is most reactive than CA while higher values in the global electrophilicity and nucleophilicity indexes are observed for C2, as compared with carquejol. Very good correlations between the experimental FTIR, FT-Raman, UV-Visible and H-1 and C-13 NMR spectra with their theoretical counterparts were found. The ECD spectrum predicted for C2 reveals the absolute configuration of CA. The complete assignment of the 84 normal vibration modes of CA is presented. (C) 2018 Elsevier B.V. All rights reserved.

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