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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 22 (1983), S. 1489-1498 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Empirical force-field calculations and ir and 1H-nmr spectra indicate that five-membered (C5) and seven-membered (C7eq) hydrogen-bonded rings are the preferred conformations of acetyl-L-Phe p-acetyl and p-valeryl anilides in nonpolar media. The C5/C7eq ratio was found to be dependent on the dryness of the solute and the solvent. This fact and the results from conformational-energy calculations suggest that a molecule of water participates in the stabilization of the C7eq conformation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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