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  • 1950-1954  (36)
  • 1
    Electronic Resource
    Electronic Resource
    The Stability of the Rare Earth Complexes with Ethylenediaminetetraacetic Acid (1953)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 75 (1953), S. 4196-4201 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01113a020
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Note on the strength of picric acid (1954)
    Springer
    Cellular and molecular life sciences 10 (1954), S. 482-483 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Am Beispiel der Pikrinsäure wird gezeigt, wie man mit Hilfe optischer Messungen auch zu der thermodynamischen Aziditätskonstante von recht starken Säuren (pK ≈ 0) kommen kann.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166167
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Besprechungen (1950)
    Springer
    Naturwissenschaften 37 (1950), S. 380-384 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Die Pyro- und die Unterphosphorsäure im Vergleich mit organischen Diphosphonsäuren (1950)
    Springer
    Monatshefte für Chemie 81 (1950), S. 202-212 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Zusammenfassung In 0,1-n KCl als Lösungsmittel konstanter ionaler Stärke wurden die zweite, dritte und vierte scheinbare Ionisationskonstante von folgenden Säuren bestimmt: Unterphosphorsäure, Pyrophosphorsäure, Methylendiphosphonsäure, Trimethylendiphosphonsäure und Tetramethylendiphosphonsäure. Die Gleichgewichtskonstanten zeigen, daß sich die Unterphosphorsäure zwanglos als nulltes Glied bei den organischen Diphosphonsäuren einordnen läßt. Völlig ungewöhnlich verhalten sich hingegen die Pyrophosphorsäure und die Methylendiphosphonsäure. Als Grund kommt nur eine besondere Bindung der Protonen bei diesen Säuren in Frage. Modellbetrachtungen zeigen in der Tat, daß einzig beim Pyrophosphat- und beim Methylendiphosphonat-anion die Protonen Wasserstoffbrücken zwischen den Sauerstoffatomen der zwei Phosphonatgruppen bilden können. Diese sechsgliedrigen Chelatringe sind offenbar für das abweichende Verhalten der beiden Säuren verantwortlich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899234
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Komplexone XXV. Die polarographische Untersuchung von Austauschgleichgewichten. Neue Daten der Bildungskonstanten von Metallkomplexen der Äthylendiamin-tetraessigsäure und der 1,2-Diaminocyclohexan-tetraessigsäure (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 937-957 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The polarograms of the metal complexes of Ethylenediaminetetraacetic Acid and of 1,2-Diaminocyclohexane-tetraacetic Acid are described. In a mixture, containing the metal complex MYv-4 as well as the uncomplexed cation M+v, it is usually possible to determine the concentration of the latter with high accuracy with the aid of a polarograph. Such measurements have been used for the determination of the ratios of the formation constants of the complexes of two metals M and M′, and from these ratios the individual formation constants of 49 complexes have been obtained. The best values of the formation constants (20°, μ = 0,1) of metal complexes are tabulated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370402
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Triäthanolamin als Puffersubstanz (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1437-1439 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermodynamic acidity constant of triethanolammonium ion has been determined at 20, 25 and 30°. Triethanolamine is recommended as a buffer substance in the pH-region 7-8,5.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370510
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Metallindikatoren VII. Ein auf Erdalkaliionen ansprechendes Phtalein und seine analytische Verwendung (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 113-120 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A derivative of phenolphtalein, carrying two iminodiacetic acid groups, which enable the substance to bind metal cations, is described. Complex formation with Mg+2, Ca+2, Sr+2, Ba+2 and Zn+2 has been investigated quantitatively and the absorption spectra of the different complexes are given. The new substance, called Phtalein-Complexone, is an excellent indicator for the complexometric titration of alcaline earth metals. A method for the titration of sulfate is also given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370114
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Die Bestimmung thermodynamischer Aciditätskonstanten (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1069-1079 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The determination of thermodynamic acidity constants (dissociation constants) requires the elimination of all salt effects by an extrapolation to zero ionic strength. Laborious curvefitting may be necessary, and the results may be of low accuracy unless an extensive series of data is available. It is shown that the extrapolation can be reduced to a simple extension of a straight line of small slope when suitable experimental data are combined in the proper way. Measurements of spectral absorption and of e.m.f., taken together, will yield thermodynamic acidity constants not obtainable by either method alone. The procedures are illustrated by the determination of the acidity constants for three uncharged acids (p-nitrophenol, 2,4-dinitrophenol and 4-chloro-2,6-dinitrophenol) and for three cationic acids (m-nitroanilinium-ion, p-chloranilinium-ion, and N,N-diethyl-p-toluidinium-ion).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370415
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Über die Normalpotentiale des Quecksilbers und die Disproportionierung: 2 HgI ⇌ Hg0 + HgII (1954)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 37 (1954), S. 1289-1297 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The apparent equilibrium constant of the reaction: \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Hg}_{{\rm f1}} + {\rm Hg}^{{\rm + 2}}\,{\!=\!=}\,{\rm Hg}_{\rm 2}^{{\rm + 2}} $$\end{document} has been determined in the temperature range from 0-40° C and in a series of solutions differing in ionic strength, in order to obtain the thermodynamic value of the constant. The result is in excellent agreement with the oxidation potentials of mercury taken from the literature. The values of ΔF, ΔH and ΔS of the above reaction have been evalueated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19540370434
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  • 10
    Electronic Resource
    Electronic Resource
    Metallkomplexe mit Polyaminen II: Mit Triamino-triäthylamin = „tren“ (1950)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 33 (1950), S. 963-974 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die Gleichgewichte bei der Komplexbildung mit β,β′,β″-Triaminotriäthylamin (= „tren“) und den folgenden Metallkationen: Mn+2, Fe+2, Co+2, Ni+2, Cu+2, Zn+2 Cd+2, Hg+2 und Ag+ untersucht. Bei den zweiwertigen Metallen bilden sich einzig bei Nickel und Quecksilber sehr unstabile Hydrogenkomplexe von der Zusammensetzung: MH2tren+4 und MHtren+3 als Zwischenstufen. Bei den andern ist das Gleichgewicht sehr einfach, indem daran einzig das Metall-kation, die Tetraminomolekel in den Neutralisationsstufen: H3tren+3, H2tren+2, Htren+, tren und der Komplex M(tren) teilnehmen. Bei Silber ist es komplizierter, indem die folgenden Partikeln auftreten: AgH2tren+2, AgHtren+2, Ag(tren)+ und Ag2tren+2. Von all diesen 16 Komplexionen sind die Bildungskonstanten ermittelt worden.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19500330426
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