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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 26 (1992), S. X 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 65 (1993), S. 1107-1107 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1223-1224 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 221-228 
    ISSN: 0268-2605
    Keywords: Mangrove ; methylation ; organotins ; dimethylmercury ; anoxic conditions ; methyltins ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Analyses of organotin and organic mercury compounds have been performed in a sediment core from Sepetiba Bay, Brazil, in order to investigate possible methylation pathways in a mangrove environment. The results have revealed that the physico-chemical conditions existing in this type of environment (high organic inputs, anaerobic conditions, microbial activity, etc.) account for high methyltin concentrations (mono-, di- and trimethyltin) in the sediments, which are dependent upon the total load of metal released (e.g. from anthropogenic sources). Furthermore, the presence of dimethylmercury and not monomethylmercury in the samples demonstrated a new pathway of transformation of mercury in the environment: this compound, thought to be unstable in sediment, is assumed to be stabilized by a conjunction of factors, such as high sulphide levels, anoxic conditions and constant inputs of methane into the medium.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1073-1082 
    ISSN: 0044-2313
    Keywords: Bismuth arene π-complexes ; bismuth xylene complexes ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heavy Metal π-Complexes. IX. The Chain Polymers ∞1[(1,2- (CH3)2C6H4BiCl3)2], ∞1[(1,3- (CH3)2C6H4BiCl3)2] and ∞1[(1,4- (CH3)2C6H4BiCl3)2]In the crystal structures of the three solid state complexes (C6H4(CH3)2BiCl3 (C6H4(CH3)2 = o-xylene: 1, m-xylene: 2, p-xylene: 3) quasi-dimeric units of almost undistorted, arene coordinated BiCl3 fragments can be found that are further associated via additional Bi—Cl contacts to form one-dimensional polymeric chains. Whereas the chains of 2 and 3 are constituted by Bi2Cl2 four-membered rings only, further Cl-bridging in 1 leads to additional trigonal-bipyramidal arrangements with Bi atoms exhibiting coordination numbers of 3 + 3 + 1 and 3 + 2 + 1, respectively (prim. + sec. Cl contacts + arene). The arene-metal bonding is characterized by Bi-arene distances in the range from 297 - 306 pm, including ring slippages of 24 -41 pm and 73 pm with the Bi atoms being six and seven coordinated, respectively. The direction of this slipping with respect to the arene's methylation sites cannot be understood in terms of electronic influences but is shown to be caused by steric demands. The values IP1 of the arenes prove to determine the colours of the complexes.
    Notes: In den Festkörperstrukturen der drei Komplexe (C6H4(CH3)2)BiCl3 (C6H4(CH3)2 = o-Xylol: 1, m-Xylol: 2, p-Xylol: 3) findet man quasidimere Einheiten fast unverzerrter, arenkoordinierter BiCl3-Fragmente, die über zusätzliche Bi—Cl-Kontakte zu eindimensionalen polymeren Ketten assoziiert sind. Während die Ketten von 2 und 3 nur aus Bi2Cl2-Vierringsegmenten bestehen, führt eine weitere Verbrückung in 1 zusätzlich zu trigonal-bipyramidalen Anordnungen mit Bi-Atomen der Koordinationszahlen 3 + 3 + 1 bzw. 3 + 2 + 1 (prim. + sek. Cl-Kontakte + Aren). Die Bindung des Arens an das Metall ist durch Bi-Aren-Abstände zwischen 297 und 306 pm charakterisiert. Die „ring slippage“ beträgt 24-41 bzw. 73 pm bei den sechsfach bzw. siebenfach koordinierten Bi-Atomen. Die Richtung dieser Verschiebung in bezug auf die Lage der Methylgruppen des Arens kann nicht auf elektronischer Basis interpretiert werden, sondern ist sterisch verursacht. Für die Farbe der Komplexe erweist sich IP1 des Arens als bestimmend.
    Additional Material: 6 Ill.
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