Buchner, Richard and Hefter, Glenn and May, Peter M. and Sipos, Pal (1999) Dielectric relaxation of dilute aqueous NaOH, NaAl(OH)(4), and NaB(OH)(4). JOURNAL OF PHYSICAL CHEMISTRY B, 103 (50). pp. 11186-11190. ISSN 1089-5647,
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The complex dielectric permittivity of aqueous NaOH (c less than or equal to 2 M) and of dilute (less than or equal to 0.6 M) NaAl(OH)(4) and NaB(OH)(4) solutions in NaOH ([Na] = 1 M) at 25 degrees C has been determined in the frequency range 0.2 less than or equal to v/GHz less than or equal to 20. All spectra could be represented by a single Cole-Cole relaxation time distribution attributed to the cooperative relaxation of the solvent. The concentration dependence of the effective hydration number of OH- has been determined. For aluminate and berate solutions the deduced parameters: effective conductivity kappa(e), static permittivity epsilon, relaxation time tau, and distribution parameter or suggest a 1:1 replacement of hydroxide by aluminate and berate, accompanied by a release of bound water. The lack of an ion-pair relaxation process despite notable ion association suggests that rapid proton exchange is important not only for the dynamics of OH- but also for Al(OH)(4)(-) and B(OH)(4)(-).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MOLECULAR-DYNAMICS SIMULATION; ELECTROLYTE-SOLUTIONS; ALUMINATE SOLUTIONS; SOLVATION; PROTON; WATER; IONS; CONSTANTS; TRANSPORT; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 06 Dec 2022 09:20 |
| Last Modified: | 06 Dec 2022 09:20 |
| URI: | https://pred.uni-regensburg.de/id/eprint/48763 |
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