Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride

Nath, Amar; Rao, K. Annaji; Thomas, Victor G.

doi:10.1524/ract.1964.3.3.134

Cited by 20 publications

(6 citation statements)

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“…Between 80 K and ambient temperature little annealing is observed, but practically complete reformation of pertechnetate takes place before thermal decomposition, very possibly by a solid State exchange mechanism. There are indications that an ambient atmosphere containing oxygen reduces anneahng [24]. The annealing of rhenium shows similar effects [25].…”

Section: Resultsmentioning

confidence: 99%

Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates

et al. 1981

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Nuclear transfer / Isomeric transition / Technetium / Hot chemistry SummaryThe chemical effects of isomeric transition of ' ""Tc have been investigated in solid lithium, potassium and ammoniuin pertechnetate matrices. The retention of "8TC in NH^ "(»"">TcO, was about 60% and in Li"(»"")TcO^ and K"("™)TCO, higher than 70%. The unretained ' was found preponderantly as a cationic and an uncharged species. Under corresponding storage conditions the retentions for Li TcO^ were higher than for KTcO,. The influence of temperature and ambient atmosphere was studied. The samples stored in vacuum showed a higher retention than those kept in air. Thermal annealing leads to an increase in retention.

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Section: Resultsmentioning

confidence: 99%

Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates

et al. 1981

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“…Small additional amounts could be eluted only after exposure to hypochlorite for several hours. It is known [1] that after alkaline oxidation, ruthenium may exist simultaneously in three valence states and that polyhydroxy complexes of ruthenium are extremely stable, defying oxidation. Nevertheless, the method can be used not only for removal, but also for isolation of gamma spectrometrically pure radioruthenium from fission products.…”

Section: Discussionmentioning

confidence: 99%

“…Further complications result from the very low rate of equilibration between different complexes. Only analytical methods by which the element is changed into one specific valence state and complex species are satisfactory, as for instance the oxidation to the volatile tetroxide or the reduction to the metal [1]. If radioruthenium is to be reduced in the absence of an isotopie carrier, a substance adsorbing the traces of ruthenium metal must be added in addition to the soluble reductant.…”

Section: Résumémentioning

confidence: 99%

“…NATH et al [1,2] had observed that oxygen inhibited annealing in trisacetylacetone Co(III) and bissalicyldehyde triethylene tetramine Co(III) chloride i. e., Co(III) TS 2 · CI · hydrate. Nitric oxide was also found to inhibit annealing in the latter complex [2], On the other hand, THOMAS [3] showed that nitric oxide promoted annealing in trisacetylacetone Co(III).…”

Section: Introductionmentioning

confidence: 99%

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Separation of Radioruthenium and other Fission Products on the Redox Ion Exchanger Zirconium Oxide Hydrate -Dithionite

1971

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Band 15, Heft 2 1971 WINKLER, SANSONI and STABKE, Separation of Radioruthenium on the Redox Ion Exchanger 65 erfolgte massenspektrometrisch, die Bestimmung des Haca spektralphotometrisch mit Ti 4+ . Für die Aktivitätsmessung wurde ein absolut geeichtes GM-Zählrohr mit Impulszähler und Ratemeter verwendet. Ein günstiger Betrieb des Bestrahlungskreislaufs konnte mit den in Tab. 3 wiedergegebenen Daten erreicht werden. Der Kreislauf stand auf der Saugseite der Pumpe unter einem konstanten He-Überdruck von 0,2 at, um Eindringen von Luft zu vermeiden. Der stationäre Betriebszustand wurde jeweils nach etwa 2 h erreicht. Verdankungen Herrn P.D. Dr. A. WYTTENBACH danken wir für die Hilfe bei den Aktivitätsmeßproblemen, der Reaktorbetriebsgruppe SAPHIR für die Unterstützung bei der Aufstellung und Durchführung der Experimente. Summary From solutions of uranium fission products, 99 to 99.9% of 103 Ru/ 108m Rh or 1M Ru/ loe Rh were deposited on a BioRad-HZO-l-dithionite column by reduction to an insoluble form, probably the metallic state. Initially retained by ion exchange, most of the other nuclides (isotopes of iodine, and of alkali, alkaline earth and rare earth elements) were separated in groups by elution. With alkaline hypochlorite solution, 65 to 80% of the deposited ruthenium/rhodium could be oxidized and also eluted. The samples were found to be radiochemically pure. Besides the residual ruthenium and a maximum of 2% of the rare earths, 95 Zr and 96 Nb remained on the column. Zusammenfassung Aus Uranspaltproduktlösungen wurden 99-99,9% des 103 Ru/ 10,m Rh bzw. 1M Ru/ loe Rh an BioRad-HZO-l-Dithionit in unlöslicher Form, wahrscheinlich durch Reduktion zum Metall, abgeschieden. Die meisten anderen Spaltnuklide (Jod-, Alkali-, Erdalkali-und Seltenerdisotope), die zunächst durch Ionenaustausch ebenfalls festgehalten werden, wurden in Gruppen eluiert. Nach Oxydation mit alkalischer Hypochloritlösung wurden 65-80% des abgeschiedenen Ruthenium/Rhodium in radiochemisch reiner Form isoliert. Neben nicht eluiertem Ruthenium blieben maximal 2% der Seltenen Erden, sowie »*Zr und "Nb auf der Austauschersäule.

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“…HABBOTTLE [3] believes that nitro ligands are being formed from the anion of the nitrate complex, and these then enter the ligand-deficient coordination sphere. NATH, RAO and THOMAS [45] have demonstrated the "oxygen effect", in annealing studies, showing that oxidation is clearly a factor in "hot" product distributions, and this could be the case with hexamminecobalt(III) nitrate, in addition to or instead of anion entry into the coordination sphere. Redox reactions probably occur here, in view of the identifiable products.…”

Section: Discussionmentioning

confidence: 99%

Phenomena Involving Neutron Capture by Selected Cobalt Complexes [1]

Stucky

Kiser

1969

Radiochimica Acta

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The identification of radiolabeled degradation products and other phenomena involving the neutron irradiation of five different cobalt complexes is reported. Solvent and pu effects upon degradation product distribution in solution are noted. Electrophoretic and chromatographic analysis correlation for radiolabeled decomposition products is discussed. Results of studies involving mass spectrometry, magnetic susceptibility, X-ray diffraction, and infra-red spectroscopy are also reported. The conclusion is drawn that there is an even larger number of factors affecting degradation product distribution for neutron-irradiated cobalt complexes than previously known. ZusammenfassungEs wird von der Erkennung von radiomarkierten Abbauprodukten und anderen Erscheinungen, die die NeutronBestrahlung von fünf verschiedenen Kobaltkomplexen betrifft, hier berichtet. Lösungsmittel-und pn-Wirkungen auf Abbauprodukt-Verteilung in Lösung werden beschrieben. Elektrophoretische und chromatographische Analysenwechselbeziehung von radiomarkierten Abbauprodukten wird besprochen. Es wird auch über Resultate in Massen-Spektroskopie, Magnetisierbarkeit, Röntgenstrahlendiffraktion und infraroter Spektroskopie berichtet. Man kommt zum Schluß, daß sogar eine noch größere Zahl von Umständen besteht, die die Verteilung von Abbauprodukten von neutronbestrahlten Kobaltkomplexen betrifft, als vorher bekannt war. RésuméOn rendre compte sur l'identification des produits de dégra-dation radiomarqués et des autres phénomènes entraînant l'irradiation de neutron de cinque complexes differente de cobalt. Les effets du solvant et ps sur la distribution des produits de dégradation en solution sont aussi constatés. La correlation de l'analyse électrophorétique et chromatographique pour produits de dégradation radiomarqués est aussi discuté. Les résultats des études concernant spectrometrie en masse, susceptibilité magnétique, diffraction radiologique et spectroscopie infra-rouge sont aussi rapportés. La déduction est tirée que même un nombre plus grand existe des facteurs touchant la distribution des produits de dégradation qu'on a su préalablement.

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Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride

Cited by 20 publications

References 2 publications

Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates

Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates

Separation of Radioruthenium and other Fission Products on the Redox Ion Exchanger Zirconium Oxide Hydrate -Dithionite

Phenomena Involving Neutron Capture by Selected Cobalt Complexes [1]

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Oxygen-Effect in Annealing of Recoil Damage in Cobalt Chelates-Tris-Acetyl-Acetone Co(III) and Bis-Salicylaldehyde Triethylenetetramine Co(III) Chloride

Cited by 20 publications

References 2 publications

Chemical Effects of the Nuclear Isomeric Transition 95mTc-95Tc in Some Solid Pertechnetates

Chemical Effects of the Nuclear Isomeric Transition 95mTc-95Tc in Some Solid Pertechnetates

Separation of Radioruthenium and other Fission Products on the Redox Ion Exchanger Zirconium Oxide Hydrate -Dithionite

Phenomena Involving Neutron Capture by Selected Cobalt Complexes [1]

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Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates

Chemical Effects of the Nuclear Isomeric Transition ^95mTc-⁹⁵Tc in Some Solid Pertechnetates