Buchner, Richard and Hefter, Glenn and May, P.M. and Sipos, P. (1999) Dielectric Relaxation of Dilute Aqueous NaOH, NaAl(OH)4, and NaB(OH)4. Journal of Physical Chemistry B 103 (50), pp. 11186-11190.
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The complex dielec. permittivity of aq. NaOH (c ≤ 2M) and of dil. (≤0.6M) NaAl(OH)4 and NaB(OH)4 solns. in NaOH ([Na] = 1M) at 25° has been detd. in the frequency range 0.2 ≤ ν/GHz ≤ 20. All spectra could be represented by a single Cole-Cole relaxation time distribution attributed to the cooperative relaxation of the solvent. The concn. dependence of the effective hydration no. of OH- has been detd. For aluminate and borate solns., the deduced parameters, viz. effective cond. κe, static permittivity ε, relaxation time τ, and distribution parameter α, suggest a 1:1 replacement of hydroxide by aluminate and borate accompanied by a release of bound water. The lack of an ion-pair relaxation process despite notable ion assocn. suggests that rapid proton exchange is important not only for the dynamics of OH- but also for Al(OH)4- and B(OH)4-.
|Institutions:||Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > PD Dr. Richard Buchner|
|Keywords:||sodium hydroxide aq soln dielec relaxation aluminum sodium hydroxide aq soln dielec relaxation boron sodium hydroxide aq soln dielec relaxation|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Yes|
|Deposited On:||14 Jun 2012 12:46|
|Last Modified:||14 Jun 2012 12:46|