The lifetime of a librational state as a measure of the elasticity of the spatial H-bond network

✍ Scribed by V. Gaiduk; M.N. Rodnikova

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 399 KB
• Volume: 82
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(99)00041-0

✦ Synopsis

The elasticity parameter Mw of the spatial H-bond network (SN) is defined and calculated as the ratio of the librational-state lifetime to the mean librational period. Wide band dielectric spectra, observed in a number of aqueous systems, are employed as the basis of the theoretical estimation of Mw, where the index w refers to water molecules. In the case of liquid water, the parameter Mw is of the order of 10; Mw sharply decreases with the temperature T increase because of the weakening of the SN. In the case of a nonelectrolyte aqueous solution, viz. dimethyl sulfoxide (DMSO)-H20, Mw increases with the rise of DMSO concentration. In the cases of NaCl-water and KCl-water solutions, the elasticity parameter Mw increases or decreases, respectively, when the concentration of electrolytes rises. This theoretical result corresponds to the sign (positive or negative) of hydration.