Alkaline Selenide, Polyselenide Electrolytes: Concentrations, Absorption Spectra and Formal Potentials

Lyons L.E. and Young T.L. (1985) Alkaline Selenide, Polyselenide Electrolytes: Concentrations, Absorption Spectra and Formal Potentials. Australian Journal of Chemistry, 39 3: 511-527. doi:10.1071/CH9860511


Author Lyons L.E.
Young T.L.
Title Alkaline Selenide, Polyselenide Electrolytes: Concentrations, Absorption Spectra and Formal Potentials
Journal name Australian Journal of Chemistry   Check publisher's open access policy
ISSN 1445-0038
Publication date 1985-01-01
Sub-type Article (original research)
DOI 10.1071/CH9860511
Open Access Status Not yet assessed
Volume 39
Issue 3
Start page 511
End page 527
Total pages 17
Subject 1600 Chemistry
Abstract Spectrophotometric, titrimetric, electron spin resonance and 77Se nuclear magnetic resonance studies made on the alkaline selenide, selenium electrolyte showed that soluble selenium species existed in four oxidation states, none of the species was a radical, and the mean state of oxidation of the Se-saturated solution was equivalent to Se3.8 2-. It was concluded that the species were Sen 2- with n = 1, 2, 3 and 4, or their protonated forms. On the basis of the Nernst equation, we analysed independently (a) the titration Eredox against the mean state of oxidation of the solution and (b) the absorption spectra of solutions with different mean states of oxidation. Thus formal redox potentials E' were determined as E'12 = -0.935, E'13 = -0.931 and E'14 = -0.914 V against s.c.e. for the couples Se2-, Se2 2-, Se2-, Se3 2- and Se2-, Se4 2- respectively in 1 mol dm-3 KOH supporting electrolyte at 304 K. It followed that E'23 = -0.919 for Se2-, Se32- and E' = -0.778 for Se3 2-, Se4 2- The concentration of each species at each redox potential and the absorption spectrum of each distinct oxidation state were found. Excellent fits and agreement between the two analyses were observed. Ultraviolet absorption spectra showed that the reduced ion was approximately 50% protonated in 1 mol dm-3 KOH supporting electrolyte.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 30 Aug 2016, 14:27:01 EST by System User