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Thin layer spectroelectrochemical (RVC-OTTLE) studies of pertechnetate reduction in acidic media.

Chotkowski M, Czerwiński A - J Radioanal Nucl Chem (2014)

Bottom Line: The electroreduction of the pertechnetate ions has been examined in sulfuric acid solutions (0.5-4 M) using optically transparent thin layer spectroelectrochemical (RVC-OTTLE) cell.Soluble Tc(III), TcO(2+) and [Tc(μ-O)2Tc](3+/4+) species with absorption bands at 420-450, 400, and 502 nm, respectively, were found to be formed during the reduction of TcO4 (-) ions.The strongly acidic medium was found to stabilize technetium ionic forms with lower oxidation states.

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Affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.

ABSTRACT

The electroreduction of the pertechnetate ions has been examined in sulfuric acid solutions (0.5-4 M) using optically transparent thin layer spectroelectrochemical (RVC-OTTLE) cell. Soluble Tc(III), TcO(2+) and [Tc(μ-O)2Tc](3+/4+) species with absorption bands at 420-450, 400, and 502 nm, respectively, were found to be formed during the reduction of TcO4 (-) ions. The strongly acidic medium was found to stabilize technetium ionic forms with lower oxidation states. Spectroelectrochemical measurements performed in 4 M H2SO4 show different stability of dimeric structure of Tc(III, IV) and simple TcO(2+) ions. The monooxotechnetium(IV) ions can be electrooxidized at potentials lower than 0.6 V versus Ag,AgCl(sat.) while dimeric structures of Tc, [Tc(μ-O)2Tc](3+/4+), are electrooxidized to pertechnetate ions at potentials higher than 0.8 V versus Ag,AgCl(sat.).

No MeSH data available.


UV–Vis spectra recorded during chronoamperometric experiment in 0.5 mM KTcO4 + 4 M H2SO4. Applied potential program (1 min. for each step): 0.5 V → 1.1 V → 0.4 V → 1.1 V → 0.3 V → 1.1 V → 0.1 V → 1.1 V → 0 V → 1.1 V → −0.1 V
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Fig5: UV–Vis spectra recorded during chronoamperometric experiment in 0.5 mM KTcO4 + 4 M H2SO4. Applied potential program (1 min. for each step): 0.5 V → 1.1 V → 0.4 V → 1.1 V → 0.3 V → 1.1 V → 0.1 V → 1.1 V → 0 V → 1.1 V → −0.1 V

Mentions: Figures 5 and 6 present UV–Vis spectra recorded during chronoamperometric reduction of pertechnetate ions in 4 M H2SO4. Two procedures were applied:Fig. 5


Thin layer spectroelectrochemical (RVC-OTTLE) studies of pertechnetate reduction in acidic media.

Chotkowski M, Czerwiński A - J Radioanal Nucl Chem (2014)

UV–Vis spectra recorded during chronoamperometric experiment in 0.5 mM KTcO4 + 4 M H2SO4. Applied potential program (1 min. for each step): 0.5 V → 1.1 V → 0.4 V → 1.1 V → 0.3 V → 1.1 V → 0.1 V → 1.1 V → 0 V → 1.1 V → −0.1 V
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4514659&req=5

Fig5: UV–Vis spectra recorded during chronoamperometric experiment in 0.5 mM KTcO4 + 4 M H2SO4. Applied potential program (1 min. for each step): 0.5 V → 1.1 V → 0.4 V → 1.1 V → 0.3 V → 1.1 V → 0.1 V → 1.1 V → 0 V → 1.1 V → −0.1 V
Mentions: Figures 5 and 6 present UV–Vis spectra recorded during chronoamperometric reduction of pertechnetate ions in 4 M H2SO4. Two procedures were applied:Fig. 5

Bottom Line: The electroreduction of the pertechnetate ions has been examined in sulfuric acid solutions (0.5-4 M) using optically transparent thin layer spectroelectrochemical (RVC-OTTLE) cell.Soluble Tc(III), TcO(2+) and [Tc(μ-O)2Tc](3+/4+) species with absorption bands at 420-450, 400, and 502 nm, respectively, were found to be formed during the reduction of TcO4 (-) ions.The strongly acidic medium was found to stabilize technetium ionic forms with lower oxidation states.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.

ABSTRACT

The electroreduction of the pertechnetate ions has been examined in sulfuric acid solutions (0.5-4 M) using optically transparent thin layer spectroelectrochemical (RVC-OTTLE) cell. Soluble Tc(III), TcO(2+) and [Tc(μ-O)2Tc](3+/4+) species with absorption bands at 420-450, 400, and 502 nm, respectively, were found to be formed during the reduction of TcO4 (-) ions. The strongly acidic medium was found to stabilize technetium ionic forms with lower oxidation states. Spectroelectrochemical measurements performed in 4 M H2SO4 show different stability of dimeric structure of Tc(III, IV) and simple TcO(2+) ions. The monooxotechnetium(IV) ions can be electrooxidized at potentials lower than 0.6 V versus Ag,AgCl(sat.) while dimeric structures of Tc, [Tc(μ-O)2Tc](3+/4+), are electrooxidized to pertechnetate ions at potentials higher than 0.8 V versus Ag,AgCl(sat.).

No MeSH data available.