Homochiral vs. heterochiral sodium core dimers of tartaric acid esters: A mass spectrometry and vibrational spectroscopy study

Publication date: Available online 14 December 2019Source: Journal of Molecular StructureAuthor(s): Katia Le Barbu-Debus, Debora Scuderi, Valeria Lepère, Anne ZehnackerAbstractThe mixed sodium core dimers of dimethyl-l-tartrate (Lmt) and the two enantiomers of diisopropyl tartrate (Lipt and Dipt) are studied by mass spectrometry coupled with laser vibrational spectroscopy. Infra-Red Multiple Photon Dissociation (IRMPD) spectra of the two diastereomer sodium-core dimers, namely, LmtLiptNa+ and LmtDiptNa+, are identical in the fingerprint region but show a slight difference in the OH stretch region. Comparison to ab initio calculations indicates that the formed complexes probably reflect the structures pre-existing in solution. The difference between LmtLiptNa+ and LmtDiptNa+ arises from the presence of an additional Na+ … O interactions in the homochiral complex. The two complexes also differ in the strength and nature of the OH…OC hydrogen bond.
Source: Journal of Molecular Structure - Category: Molecular Biology Source Type: research