Structural transition to electrolyte-water solvent and changes in the molecular dynamics of water and properties of solutions

Citation
Ak. Lyashchenko et Ay. Zasetskii, Structural transition to electrolyte-water solvent and changes in the molecular dynamics of water and properties of solutions, J STRUCT CH, 39(5), 1998, pp. 694-703
Citations number
36
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF STRUCTURAL CHEMISTRY
ISSN journal
00224766 → ACNP
Volume
39
Issue
5
Year of publication
1998
Pages
694 - 703
Database
ISI
SICI code
0022-4766(199809/10)39:5<694:STTESA>2.0.ZU;2-K
Abstract
A model of concentration transition "ions and complexes in a water structur e --> ionic and ionic-aqueous clusters --> polymer structures of salt and c rystal hydrate melts" is suggested. The appearance of cluster nanostructure s outside the first zone of a water-like structure is regarded as a general characteristic of solutions. The characteristics of solutions, phase equil ibria, and salts of complex composition are interpreted based on this model . Investigation of the complex dielectric constant of electrolytic solution s in the SHF and EHF bands (7-119 GHz) at high concentrations showed that t here are two dispersion regions in which the relaxation times differ by a f actor of 5-10. Relaxation processes are separated, the numbers of molecules in hydration shells are calculated and relaxation times are determined for bulky tetrahedral water with hydration shells of ions, for clusters, and f or ionic-aqueous polymer chains. It is shown that the two structure subsyst ems of wafer molecules in concentrated solutions may be described using the limited rotator/generalized diffusion molecular model.