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  • 1980-1984  (3)
  • 1975-1979  (2)
  • Inorganic Chemistry  (2)
  • oxidation  (2)
  • Fe(III)
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  • 1
    Digitale Medien
    Digitale Medien
    Electrochemistry of copper in aqueous acetonitrile (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 757-774 
    Details
    ISSN: 1572-8927
    Schlagwort(e): Cu(II)/Cu(I) couple ; Cu(I)/Cu(0) couple ; acetonitrile-water mixtures ; Fe(III) ; 2-hydroxycyanoethane ; electrochemistry ; voltammetry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The electrochemical characteristics of the Cu (II)/Cu (I) and the Cu (I)/Cu (0) couples at platinum, carbon, mercury and copper have been studied in acetonitrile-water (AN-H2O) mixtures. All the electrode processes are moderately fast with mercury the fastest but slower on platinum and carbon paste in that order. A slow chemical step precedes oxidation of Cu (I) to Cu (II) on allectrodes in solutions of high AN content. The slow step may be partial removal of AN from the solvated Cu (I) ion prior to electron transfer. Electrode processes are faster in chloride ions than in sulfate ion solutions. Reduction of Cu (I) in AN−H2O is quite slow on glassy carbon. Adsorption of AN on platinum and carbon influences the processes. Diffusion coefficients in sulfate solutions are in the order, Cu (I) (AN−H2O)〉Cu (II)(AN−H2O)〉Fe (III)(H2O) and 2-hydroxy-cyanoethane (2-HCE) strongly decreases the mobility of Cu (I) when added to H2O. The relevance of the measurements to hydrometallurgical processes is considered. CuSO4 in 30% v/v AN−H2O is a ‘faster’ oxidant than the common oxidant Fe2(SO4)3 in H2O because of the greater mobility and faster electron acceptance from a corroding surface of Cu (II). Only in solutions of very high nitrile content is the reduction potential of CuSO4 as high as that of Fe2(SO4)3 in H2O.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00649487
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  • 2
    Digitale Medien
    Digitale Medien
    Reaction of cobalt in Ar-SO2 atmospheres at 500–900°C (1978)
    Springer
    Oxidation of metals 12 (1978), S. 23-34 
    Details
    ISSN: 1573-4889
    Schlagwort(e): cobalt ; oxidation ; sulfidation ; conjoint attack
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The attack of cobalt by sulfur and oygen simultaneously in Ar-SO2 atmospheres in the temperature range 500–900°C has been found to conform to the pattern established by the attack of other metals under similar conditions. A thermodynamic and kinetic interpretation of the mechanism has been proposed. The results also indicate that during the initial stages sulfur diffuses through the initially formed oxide layer, eventually leading to formation of the commonly observed duplex sulfide and oxide scale.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00609973
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  • 3
    Digitale Medien
    Digitale Medien
    Penetration of sulfur through preformed protective oxide scales (1983)
    Springer
    Oxidation of metals 19 (1983), S. 37-52 
    Details
    ISSN: 1573-4889
    Schlagwort(e): oxidation ; sulfidation ; penetration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Thermodynamic assessment of sulfur penetration through otherwise protective scales such as Cr2O3, Al2O3 has been carried out for Co-Cr- and Co-Cr-Al-base alloys. Limiting conditions for sulfide formation following gas molecular transport and solution-diffusion transport have been established and the results partially confirmed by experiments carried out on Co-10Cr, Co-25Cr, and Co-10Cr-5Al alloys in sulfurous atmospheres. The results show that molecular transport of sulfurous gas species through the growing oxide scale definitely occurs. It was not possible to confirm or disprove the solutiondiffusion mechanism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00656229
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  • 4
    Digitale Medien
    Digitale Medien
    Studies on MM″(NCS)4 [M=Ni(II), Fe(II), Zn(II), and M″=Hg(II) Zn(II)] complexes (1976)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 423 (1976), S. 173-179 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Untersuchungen an MM″ (NCS)4-Komplexen (M = NiII, FeII, ZnII; M″ = HgII, ZnII)Komplexe des Typs MM′(NCS)4 · xL M = NiII, FeII, ZnII; M″ = HgII, ZnII; x = 2, 4, 6; L = Nicotinamid (nia), Isonicotinsaiurehydroxid (inh) 2-Aminopyrimidin (2apm)] wurden dargestellt und charakterisiert durch Elementaranalyse, molare Leitfähigkeit, magnetisches Moment, IR- und Elektronenspektren.
    Notizen: Coordination complexes of the type MM″(NCS)4 · xL M = Ni(II), Fe(II), Zn(II), M″ = Hg(II), Zn(II), x = 2, 4, 6 and L = nicotinamide (nia), 3-cyanopyridine (3-cpy), 4-cyanopyridine (4cpy), 4-aminopyridine (4apy), isonicotinic acid hydrazide (inh), 2-aminopyrimidine (2apm)l have been prepared and characterized by elemental analysis, molar conductance, magnetic moment, infrared and electronic spectral studies. Molar conductance data of NiZn(NCS), complexes are equivalent to 1:1 electrolyte. The infrared spectral studies indicate that only bridged thiocyanate groups are present in the complexes of the type NiHg(SCN)4 · 4L [L=3 and 4cpy, inh] and FeHg(SCN)4 · 2L [L = nia, 2apm], whereas both bridged and terminal thiocyanates are present in the complexes of the type NiHg(SCN)4 · 4L [L = nia, 3apy and ZnHg(SCN)4 · 2(inh). BOHR magneton values and electronic spectral data indicate an octahedral environment around nickel and iron in their complexes. Symmetry and group theory have also been used to establish the structure of the complexes.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19764230211
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  • 5
    Digitale Medien
    Digitale Medien
    Quantitative softness parameters and their application in elucidation of Structure of Bimetallic Tetrathiocyanate Complexes (1980)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 461 (1980), S. 222-230 
    Details
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Quantitative „Softness“ Parameter und ihre Anwendung in der Strukturaufklärung von Bimetalltetracyanat-Komplexen〉2M(NCS)2M′(SCN)2〈 und [Ml6][M′(SCN)4], (M = COII und NiII; M′ = ZnII, CdII und HgII, L = Anilin, p-Toluidin, Pyridin, Nicotinamid, 2,2′-Bipyridin und 4-Aminopyridin) wurden dargestellt und charackterisiert. Die Strukturen werden auf Grund von Leitfähigkeits-, magnetischen und spektroskopischen (IR und VIS) Messungen, sowie durch gruppentheoretische Berechnungen und Ligandenfeldparametern vorgeschlagen. Diese Strukturvorschläge werden gestützt durch quantitative „Softness“ - Werte „\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm E}_{\rm n}^{_ + ^ +},{\rm E}_{\rm m}^{_{\rm +}^{\rm +}} $\end{document}“. Die totale „Softness“ von M und M′ und ihre Differenz \documentclass{article}\pagestyle{empty}\begin{document}$ \Delta {\rm TE}_{\rm n}^{_ + ^ +} \left({{\rm M} - {\rm M}'} \right) $\end{document} wurden abgeleitet (Gleichungen siehe Abstract) und mit der Struktur der Komplexe in Verbindung gebracht.
    Notizen: 〉2M(NCS)2M′(SCN)2〈 and [ML6][M′(SCN)4], (M = Co(II) and Ni(II), M′ = Zn(II), Cd(II) and Hg(II) and L = aniline(ani), p-toluidine(tol), pyridine(py), nicotinamide(nia), 2,2′-bipyridine(bipy) and 4-aminopyridine (apy)) have been prepared and characterized. Their structure have been proposed on the basis of molar conductance, magnetic moment, group theoretical calculations, ligand field parameters, infrared and electronic spectral studies. The proposed structures have also been supported by quantitative values of softness „\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm E}_{\rm n}^{_ + ^ +},{\rm E}_{\rm m}^{_{\rm +}^{\rm +}} $\end{document}“,. Total softness of M and M′ and their difference \documentclass{article}\pagestyle{empty}\begin{document}$ \Delta {\rm TE}_{\rm n}^{_ + ^ +} \left({{\rm M} - {\rm M}'} \right) $\end{document} have also been derived by the following equations and related to the structure of the complexes. \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm TE}_{\rm n}^{_ + ^ +} \left({\rm M} \right) = {\rm E}_{\rm n}^{_ + ^ +} \left({\rm M} \right) + \sum {\rm E}_{\rm m}^{_ + ^ +} \left({\rm L} \right) + \sum {\rm E}_{\rm m}^{_ + ^ +} \left({{\rm NCS}} \right) $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm TE}_{\rm n}^{_ + ^ +} \left({{\rm M}}^\prime \right) = {\rm E}_{\rm n}^{_ + ^ +} \left({{\rm M}}^\prime \right) + \sum {\rm E}_{\rm m}^{_ + ^ +} \left({\rm L} \right) + \sum {\rm E}_{\rm m}^{_ + ^ +} \left({{\rm SCN}} \right) $$\end{document} \documentclass{article}\pagestyle{empty}\begin{document}$$ \Delta {\rm TE}_{\rm n}^{_ + ^ +} \left({{\rm M} - {\rm M}^\prime} \right) = \,|\,{\rm TE}_{\rm n}^{_ + ^ +} \left({\rm M} \right) - {\rm TE}_{\rm n}^{_ + ^ +} \left({{\rm M}}^\prime \right)$$\end{document}.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/zaac.19804610134
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