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Cover Feature: Competition Between Intra‐ and Intermolecular Hydrogen Bonding: o ‐Anisic Acid⋅⋅⋅Formic Acid Heterodimer (Chem. Eur. J. 53/2019)
Author(s) -
Macario Alberto,
Blanco Susana,
Thomas Javix,
Xu Yunjie,
López Juan Carlos
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201903067
Subject(s) - formic acid , hydrogen bond , chemistry , intermolecular force , moiety , intramolecular force , carboxylic acid , conformational isomerism , molecule , methanol , stereochemistry , organic chemistry
Four conformers of the heterodimer o ‐anisic acid–formic acid, formed in a supersonic expansion, have been probed by Fourier transform microwave spectroscopy. Two of these forms have the typical double intermolecular hydrogen bond cyclic structure. The other two show the o ‐anisic acid moiety bearing a trans ‐COOH arrangement supported by an intramolecular O‐H⋅⋅O bond to the neighbor methoxy group. The image shows the plant of the anise that represents the o ‐anisic acid molecule, which is present in the seed of the flower, and an ant, which represents the formic acid. Both molecules form the cluster described in the article. The ant shows surprise from the fact that the carboxylic group of o‐ anisic acid continues to be in trans disposition after adding formic acid. More information can be found in the Full Paper by S. Blanco, J. C. López, et al. on page 12325.