Temperature Dependence of Ionic Association, and of Molecular Relaxation Dynamics of LiAsF6 in 2-Methyltetrahydofuran.
Abstract
Electrical conductance data in the temperature range 25 to -35 C, analyzed by the Fuoss-Kraus triple-ions theory of conductance, reveal the presence of both ion pairs and triple ions. Evidence of the presence of the latter ones persists (with the formation constant K sub T somewhat increased) even by allowing for measured change of solvent permittivity with concentration of electrolyte. This dispenses any remaining doubt on the existence of triple ions. Formation constants K sub P and K sub T at various temperature for ion-pairs and triple ions respectively have been determined. These figures are compared with values calculated by the Bjerrum theory of ion-pairs formation and by the Delsignore-Bjerrum theory for formation of triple ions, respectively. Ultrasonic relaxation spectra, in the concentration range 0.1M to 0.4M of LiAsF6 and is the frequency range 0.5 to 400 MHz at 15 and 5 C in 2MeTHF, are reported. Infrared spectra in the Nu sub 3 band envelope of the AsF6ion, in the concentration range 0.05 to 0.8M, reveal the presence of three separated bands.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1986
- Accession Number
- ADA175673
Entities
People
- Meizhen Xu
- Naoki Inoue
- Sergio Petrucci