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  • Polymer and Materials Science  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Einige Modelluntersuchungen zur Chemie und Struktur von Polyvinylpyrrolidon-HalogenophorenHerrn Professor Dr. H. Pommer zum 60. Geburtstag gewidmet (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1871-1888 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyvinylpyrrolidone forms complexes with hydrogen halides (HX; X = Cl, Br, I) and halogen molecules (Y2; Y = Br, I). For these compounds a structure is proposed in which the proton is coordinated to the carbonyl groups of two pyrrolidone rings by strong hydrogen bonds. The \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm XY}_{\rm 2}^ \ominus $\end{document}-anion is attached ionically to this complex cation. The structure of these complexes could be elucidated by comparative examination of the Lig2 · HX · Y2-complexes of model compounds such as N,N-dimethylacetamide, N-alkyl-2-pyrrolidones (2a - d), and 1,3-bis(2-oxo-1-pyrrolidinyl)butane (3) and the analogous polyvinylpyrrolidone complexes. The structure of the (N-methyl-pyrrolidone)2 · HI3-complex was examined by X-ray structure analysis. In a similar way the potassium salts (Lig2 · KX · Y2) of the complex acids could be prepared from the ligands, potassium halides, and halogen molecules. Unlike the proton, the potassium cation appears to be only weakly attached to the carbonyl groups of the ligands.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810909
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  • 2
    Electronic Resource
    Electronic Resource
    Üuber poly-[3 (bzw. 5)-vinyl-pyrazol-derivate] und ihr metallionenbindungsvermögenHerrn Professor Dr. K. HAMANN zum 65. Geburtstag gewidmetAuszugsweise vorgetragen beim Makromol. Colloquium in Freiburg/Brsg. 1970. Teile der Dissertation H.-U. SCHENCK, Berlin 1969. (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 150 (1971), S. 25-40 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Homopolymers of 3(resp. 5)-vinyl-pyrazolderivates were obtained by radical solution polymerisation and their properties were examined. Resins of limited swelling were prepared by copolymerisation of 2.5 mole-% bis-[3(resp. 5)-vinyl-5(resp. 3)-pyrazolyl]-ketone with 3(resp. 5)-vinyl-5(resp. 3)-pyrazolecarboxylic acid ethyl ester (I) or 3(resp. 5)-vinyl-4.5(resp. 3)-pyrazoledicarboxylic acid dimethyl ester (II). By saponification they were converted to poly-vinyl-pyrazole-carboxylic acid resins (resin A1 and resin A2). The latter are chelating resins of high capacity. The possibility of binding the metal ions Cu2⊕, Ni2⊕, Zn2⊕, and Mg2⊕ and the sorption rate was studied in the pH range 1-5.5.
    Notes: Durch radikalische Lösungspolymerisation wurden Homopolymere von 3(bzw. 5)-Vinylpyrazol-derivaten erhalten und deren Eigenschaften untersucht. Durch Copolymerisation von 2,5 Mol-% Bis-[3(bzw. 5)-vinyl-5(bzw. 3)-pyrazolyl]-keton mit 3(bzw. 5)-Vinyl-5(bzw. 3)-pyrazol-carbonsäureäthylester (I) bzw. 3(bzw. 5)-Vinyl-4.5(bzw.3)-pyrazol-dicarbonsäuredimethylester (II) wurden Harze dargestellt, die nur begrenzt quellbar sind und die durch Verseifung in Poly-[vinyl-pyrazol-carbonsäure]-harze (Harz A1 und Harz A2) überführt wurden. Diese Harze stellen hochkapazitive Chelatharze dar. Es wurde das Metallionenbindungsvermögen für Cu2⊕, Ni2⊕, Zn2⊕ und Mg2⊕ und die Aufnahmegeschwindigkeit in Abhängigkeit vom pH-Wert im Bereich von pH 1 bis pH 5,5 untersucht.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021500102
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    Paper (German National Licenses)
    Fulltext
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