Oxidation of aqueous polyselenide solutions. A mechanistic pulse radiolysis study

Journal Article · Thu May 04 00:00:00 EDT 2000 · Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory

DOI:https://doi.org/10.1021/jp994361g· OSTI ID:20034421

Goldbach, A; Saboungi, M L; Johnson, J A; Cook, A R; Meisel, D

The oxidation of aqueous polyselenide solutions was studied by pulse radiolysis in the presence of N{sub 2}O at pH 12.3; the hydroxyl radical OH was the predominant oxidant, while hydrogen selenide anions HSe{sup {minus}} and triselenide dianions Se{sub 3}{sup 2{minus}} were the major selenide species in the starting solution. The progress of the oxidation was monitored by optical spectroscopy. Transient polyselenides appeared immediately after the electron pulse and rapidly proceeded to form adducts with HSe{sup {minus}}, i.e., HSe{sub 2}{sup 2{minus}} and H{sub 2}Se{sub 2}{sup {minus}}, and a fairly long-lived intermediate that was identified as the diselenide radical anion Se{sub 2}{sup {minus}}. These radicals recombine to give eventually the tetraselenide dianion, Se{sub 4}{sup 2{minus}}.

• Research Organization: Univ. of Stuttgart (DE)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 20034421
• Journal Information: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 104, Issue 17; Other Information: PBD: 4 May 2000; ISSN 1089-5639
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
SELENIDES
PHOTOELECTROCHEMICAL CELLS
OXIDATION
HYDROXYL RADICALS
PULSED IRRADIATION
REACTION INTERMEDIATES
RADIOLYSIS
ELECTRONS