Competition between inter and intramolecular hydrogen bond evidenced by vibrational circular dichroism spectroscopy: The case of (1<i>S</i>,2<i>R</i>)‐(−)‐<i>cis</i>‐1‐amino‐2‐indanol
Katia Le Barbu‐Debus, Anne Zehnacker
Abstract
Abstract The infrared (IR) absorption and vibrational circular dichroism (VCD) spectra of an intramolecularly hydrogen‐bonded chiral amino‐alcohol, (1 S ,2 R )‐(−)‐ cis ‐1‐amino‐2‐indanol, are studied in DMSO‐ d 6 . The spectra are simulated at the density functional theory (DFT) level within the frame of the cluster‐in‐the‐liquid model. Both IR and VCD spectra show a clear signature of the formation of intermolecular hydrogen bonds at the detriment of the intramolecular OH … N interaction present in the isolated molecule. Two solvent molecules are necessary to reproduce the experimental spectra. Whereas the first DMSO molecule captures the main spectral modifications due to hydrogen bond formation between the solute and the solvent, the second DMSO molecule is necessary for a good description of the Boltzmann contribution of the different complexes, based on their Gibbs free energy.