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  • Chemistry  (2)
  • adenosine  (2)
  • gamma-pyrodiphenone  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of applied electrochemistry 28 (1998), S. 1067-1071 
    ISSN: 1572-8838
    Keywords: copper corrosion inhibition ; gamma-pyrodiphenone ; XPS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The inhibition effect of gamma-pyrodiphenone (γPD) on copper corrosion in near neutral sulphate solutions was investigated. Weight loss and polarization measurements show a high inhibition efficiency (〉96%) of γPD on copper corrosion at extremely low concentrations. γPD suppresses active copper dissolution and oxygen reduction. The potentiodynamic cathodic reduction measurements showed an inhibition of oxide formation and stabilization of the Cu2O oxide in the presence of γPD. XPS measurements suggested that the high inhibition effect of γPD on copper corrosion is due to the adsorption of γPD molecules, as a first stage, and the formation of a film with a polymer-like structure by coordination of γPD with Cu2O on prolonged exposure.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-8221
    Keywords: adenosine ; cyclic nucleotides ; myocardial infarction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 44 (1993), S. 187-192 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Mechanismus der Inhibitionswirkung von α-Pyrophthalon bei der Korrosion von KupferDer Mechanismus der Inhibitionswirkung von α-(Pyridyl)-1,3-indandion (bekannt als α-Pyrophthalon) bei der Korrosion von Kupfer in neutralen wäßrigen Lösungen wurde durch XPS-Analysen der Oberfläche, Kapazitäts- und Polarisationsmessungen untersucht.Das α-Pyrophthalon verlangsamt sowohl die kathodischen als auch die anodischen Partialreaktionen. Die Kapazitätsmessungen zeigen Adsorption der Inhibitormoleküle auf der Kupferoberfläche bei Potentialen, die viel negativer als das Korrosionspotential sind.Durch XPS-Analysen der Oberfläche wurde festgestellt, daß die Inhibitionswirkung von α-Pyrophthalon auf den Korrosionsvorgang einer Cu(αPP)2-Komplexbildung an der Kupferoberfläche zu verdanken ist. Die Zusammensetzung und die Struktur des Inhibitionsfilms setzen einen komplexen Verlauf der Reaktionen der Kupferoxidbildung und der Bildung und Ablagerung des Cu(αPP)2-Komplexes an der Oberfläche voraus.
    Notes: The mechanism of the inhibiting action of α-(pyridyl)-1,3-indandione (known as α-pyrophthalone, αPP) in the corrosion of copper in nearly neutral solutions is studied by XPS analysis of the metal surface, capacitance and polarization measurements.α-Pyrophthalone decreases the rate of the cathodic as well as of the anodic partial reaction. The capacitance measurements show that the inhibitor's molecules adsorb on the copper surface at potential values more negative than that of the corrosion potential.According to the data of the XPS analysis the inhibiting action of α-pyrophthalone on the corrosion process is determined by the formation of a Cu(αPP)2-complex on the copper surface. The composition and the structure of the inhibiting film show a complex process of the formation and the precipitation of the Cu(αPP)2-complex on the surface.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 106 (1988), S. 1244-1246 
    ISSN: 1573-8221
    Keywords: adenosine ; cyclic nucleotides ; brain structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 5 (1973), S. 593-613 
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Oxygen added in amounts of 0.01-0.1% was found to cause the explosion of an acetylene-chlorine mixture at temperatures as low as -78°C. Explosion occurrence and nature depend on the mode of mixing the reactants, the effect of oxygen being associated with concentration limits. The dependence of explosion-inducing oxygen amounts on temperature, pressure, concentrations of reactants, reactor surface type and area, additions of inert gases, and reaction products were investigated. The effect of light on the C2H2 + Cl2 + O2 was studied. The composition of gaseous products resulting from acetylene-chlorine mixture explosion in the presence of minute amounts of oxygen, from a slow reaction inhibited and noninhibited by oxygen, and also from explosion at 400°C in the absence of oxygen, was determined. The results obtained point to the fact that any acetylene-chlorine mixture flash caused by small amounts of oxygen is a branched chain reaction involving activated particles, chain branching presumably being associated with the decomposition of radical CHCl=CHOO* → CH + HCl + CO2.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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