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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 375 (1970), S. 315-319 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mit N-Benzolsulfonyl-l-glutaminsäure (RH3) als Chelatligand wurden K4CuR2 · 4H2O, K4HgR2 · 3H2O und Pb(RH2)(OH)(H2O) dargestellt. Letzteres ist nach Röntgenpulverdaten isostrukturell mit Cd(RH2)(OH)(H2O). RH3 ist eine schwache zweibasige Säure (pK2* = 3,14; pK1* = 4,62). Für die Stabilität ihrer Zn- und Cd-Komplexe gilt Zn ≤ Cd. Aus den Konstanten der beiden ersten Protonierungsstufen von HgR24- und CuR24- wird die Stabilitätsfolge HgII 〉 CuII abgeleitet.
    Notes: Using N-benzenesulphonyl l-glutamic acid (RH3) as chelating agent, the preparation of K4CuR2, 4H2O; K4HgR2, 3H2O and Pb(RH2)(OH)(H2O) has been described. X-ray powder photographs show that Pb(RH2)(OH)(H2O) and Cd(RH2)(OH)(H2O) are isostructural. RH3 is a weak dibasic acid; pK2* and pK1* are found to be 3.14 and 4.62 respectively. A study on the formation of Zn and Cd complexes shows that the stability order is Zn ≤ Cd. Acid association constants of the ions HgR24- and CuR24- have been determined only up to two steps because precipitation took place on further titration. These constants are considered to be related to the stability of the complexes and the order is Hg(II) 〉 Cu(II).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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