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  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Incomplete Chelation by N-Acylthioureas: Structure of Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato] mercury(II)Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato]mercury(II) crystallizes in the monoclinic space group P21/c with a = 10.126, b = 22.347, c = 11.384 Å, β = 109.13° and Z = 4. The structure was solved by application of direct methods to difference structure factors (DIRDIF). The final R value was R = 0.06 for 2195 observed reflections. Mercury exhibits the characteristic coordination number 2 with linear arrangement of the S ligators. Both O ligators, however, show weak bonds to Hg. For that reason the mercury complex should be better described as a labilized chelate with the effective coordination number 4. With regard to the excellent extractibility of mercury(II) with N-acylthioureas the formation and existence, respectively, of such a labilized chelate seems to be favourable.
    Notes: Bis[N-(1-pyrrolidinyl-thiocarbonyl)-benzamidato] quecksilber(II) kristallisiert onoklin in der Raumgruppe P21/c mit den Gitterkonstanten a = 10,126, b = 22,347, c = 11,384 Å, β = 109,13° und Z = 4. Gelöst wurde die Struktur durch Anwendung direkter Methoden auf Differenzstrukturfaktoren (DIRDIF). Für 2195 beobachtete Reflexe betrug der abschließende R-Wert R = 0,06. Quecksilber besitzt die charakteristische Koordinationszahl 2 mit linearer Anordnung der beiden S-Ligatoren. Die O-Ligatoren zeigen jedoch noch schwache Bindungen zum Hg, so daß der Hg-Komplex besser als labilisiertes Chelat mit der effektiven Koordinationszahl 4 beschrieben werden sollte.Für die vorzügliche Extrahierbarkeit von HgII mittels N-Acylthioharnstoffen scheint die Bildung bzw. das Vorliegen eines solchen labilisierten Chelats Günstig zu sein.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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