Hydrogen bonding of water in organic solvents. 1

Abstract

The v2 + t>3 combination band of water has been recorded for bulk water and for very dilute solutions of water in various organic solvents. In each instance, the bands due to the organic solvent have been eliminated by placing a matched cell of pure solvent in the reference beam. This also served the purpose of cancelling any trace of moisture in the solvent before adding the measured quantity of water. This particular band was chosen because there is no interference from OH groups in hydroxylic solvents such as alcohols and glycols, and hydroxy or amido compounds of biological interest. The water band has been resolved by a computer program into three Gaussian components which have been identified with the 1:1 water-solvent and the 1:2 water-solvent complexes. The assignments have been verified by dilution of the complexes with CCI4 and CgHg. The positions of the bands and their widths at half-intensity vary in a predictable manner with the degree of hydrogen bonding and with the basicity of the solvent. The total areas under the curves are dependent, within experimental error, only on the amount of water present. Interactions between water and oxygen-containing organic solvents are strongest in DMSO of all solvents studied and weakest in nitromethane.

Compatible solutes of halophilic eubacteria: molecular principles, water-solute interaction, stress protection

“…hydration water and bulk water). The spectroscopic shift is explained by varying proportions of strongly bonded hydrogens and seems to support the view that ice-like structures (clusters) are maintained even in liquid water 45,46,5,6. As a solution of solutes is spectroscopically comprised of both bulk and hydration water, which differ with respect to their absorption maximum, near-infrared spectroscopy can be used to determine hydration numbers as well as characteristic hydration spectra of solutes by means of difference spectroscopy 55,56'72.…”

Volumetric and compressibility properties of liquid water as a solute in glycolic, propylene carbonate, and tetramethylurea solutions at T=298.15K

“…have been studied in detail [3,4]. However, such studies for water as a solute in organic polar and organic non-polar solvents are very much limited [5][6][7].…”

Anesthesia and hydrogen bonding. A semi-quantitative infrared study at room temperature

“…This band is the combination of the 0-H stretching and the 0-H in-plane bending mode. Luck and Ditter (20) and Bonner and Choi (21) have applied these bands to hydrogen bond studies several years ago. Secondary amides have a band near 5000-4900 cm-' (or 2.00-2.04 pm), also a combination of the N-H stretching mode and the N-H in-plane bending mode.…”