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  • Hormones.  (1)
  • Inorganic Chemistry  (1)
  • 1980-1984  (2)
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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Invertebrates-Physiology. ; Hormones. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (535 pages)
    Edition: 1st ed.
    ISBN: 9783642699221
    Series Statement: Proceedings in Life Sciences Series
    DDC: 592.01927
    Language: English
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations with Mercury (I) Compounds and Tin (II) Halides in Molten Mercury (II) BromideMolten mercuric bromide HgBr2 (experimental temperature 242°C) is a very stabilizing medium for mercurous compounds. The covalent mercurous halides Hg2X2 are weak solvobases in molten HgBr2, i. e. in solution exist only a few dissociated associates [Hg2X(Hg2X2)n]+ (HgBr2X)-, which react with a solvoacid HgBrA (A i. e. ClO4) to a hitherto unknown type of compound Hg2XA. Mercurous salts of mineral acids Hg2A2 are solvolized in the melt (HgBrA, Hg2BrA, Hg2Br2…). The state of equilibrium and the type of the products are mainly influenced by the anion A. In contrary to the lead(II) halides PbX2 the tin(II) halides SnX2 react not as Sn(HgBr3)2 (two-basic) but onebasic as a Lewis base. Conductometric investigations show that SnBr2 formes a soluble 2:1 adduct with Hg2Br2, which can be precipitated as perchlorate with NEt4ClO4 (Et = C2H5). The same reaction takes place, if the Lewis base SnBr2 attacks the Lewis acid Hg2BrClO4, which was generated by 4 different methods.
    Notes: Geschmolzenes Quecksilber(II)-bromid (Arbeitstemperatur 242°C) erweist sich als stabilisierendes Medium für Quecksilber(I)-Verbindungen. Die kovalenten Quecksilber(I)-Halogenide Hg2X2 verhalten sich wie schwache Solvobasen, die mit Solvosäuren HgBrA (A z.B. CIO4) unter Bildung bisher unbekannter Quecksilber(I)-Halogenosalzen Hg2XA reagieren. Quecksilber(I)-Salze von Mineralsäuren Hg2A2 unterliegen in Schmelze der Solvolyse. Die Lage des Gleichgewichts und die Art der Solvolyseprodukte wird entscheidend vom Anion A beeinflußt. Im Gegensatz zu den Blei(II)-Halogeniden PbX2 reagieren die Zinn(II)-Halogenide SnX2 nicht zweibasig als Sn(HgBr3)2, sondern einbasig als Lewis-Basen. Zinn(II)-bromid bildet mit Hg2Br2 ein lösliches 2:1 Addukt, welches mit NEt4ClO4 (Et = C2H5) als Perchlorat ausgefällt werden kann. Zur selben Reaktion kommt es bei Angriff der Lewis-Base SnBr2 auf die Lewis-Säure Hg2BrClO4, welche nach 4 verschiedenen Methoden erzeugt wurde.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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