Study of intermolecular interactions in cation-containing oligo-urethanes with a different chemical nature of the anion

Abstract IR spectroscopy has been employed to study the features of the formation of the network of physical bonds in cation-containing oligoamino urethanes on their transition from the non-ionic to the ionic form. It is shown that the existing network of hydrogen bonds between the urethane groups with an energy 16 kJ/mole is completely destroyed with formation of a new network of ion-molecular hydrogen bonds between the urethane NH groups and the anion with the energy 20–23 kJ/mole with doubling of their number. The energy of the hydrogen bond is greater on formation of the salt centre by quaternization and depends little on the chemical nature of the anion and practically does not depend on it during protonization. The ion-molecular hydrogen bond in the systems studied is preferable to the dipole-dipole interaction of the ionic centres.