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  • Articles  (53)
  • 1970-1974  (53)
  • Physics  (49)
  • Geosciences  (5)
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  • Articles  (53)
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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 6 (1973), S. 246-250 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 6 (1973), S. 589-593 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 7 (1974), S. 66-72 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
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  • 4
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 7 (1974), S. 806-809 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 252 (1974), S. 319-321 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Hydroxylamine treatment of the infectious materials extracted from fX-SS-DNA-transfected spheroplasts. The bacterial spheroplasts (109 cells ml?1) were incubated with SS-DNA (1012 molecules ml?1) for 15 min and then PAM medium was added and incubation was continued further (see legend of ...
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 18 (1972), S. 121-127 
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Assuming a dust model of Reeset al. (1969), we study the time dependence of the infrared emission from grains which absorb variable ultraviolet radiation. A time scale for the variability is shown to be fairly small compared with the light travel-time across the infrared emitting region, of which size depends on the wavelength strongly. Comparison of calculated infrared light curves with observations of NGC 4151 leads to the conclusion that the variability at 2.2 μ is consistent with interpretation by the infrared emission on the basis of thermal process.
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 164 (1973), S. 203-213 
    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: Um die katalytische Wirkung des Polymer-Liganden zu untersuchen, wurden Kupfer-Poly(vinylpyridin) (Cu-PVP)-Komplexe als Katalysatoren für die oxydative Polymerisation der Phenole eingesetzt. Der Katalyseverlauf wurde diskutiert.Die mit dem Cu-PVP-Komplex katalysierte Polymerisation des 2,6-Dimethylphenols verlief langsamer als die mit dem Kupfer-Pyridin-Komplex katalysierte. Aufgrund der Messung der kinetischen Konstanten wurde angenommen, daß der raumfüllende PVP-Ligand die Koordination des Monomeren zum Metall stört. Die Polymerisation des Monomerengemisches aus XOH und o-Kresol verlief in Gegenwart des Cu-PVP-Katalysators bei höheren Umsätzen mit konstanter Geschwindigkeit. Die Ausbeute und das Molekulargewicht des erhaltenen Polymeren waren größer als in den Fällen, in denen Cu-Pyridinoder Cu-γ-Pikolin-Komplexe als Katalysatorsysteme verwandt wurden. XOH wird vorzugsweise mit dem Cu-PVP-Katalysator aktiviert, da das Oxydationspotential des XOH niedriger ist; dadurch wird die Wirkung des PVP-Liganden erfaßbar.
    Notes: In order to study the catalytic effects of the polymer-ligand, copper-poly(vinylpyridine) (Cu-PVP) complexes were used as catalyst for the oxidative polymerization of phenols. The catalysis was discussed.The rate of the 2,6-dimethylphenol (XOH) polymerization catalyzed by the Cu-PVP complex was slower than that catalyzed by a Cu-pyridine complex. By the measurement of the kinetic constants, it was suggested that a bulky PVP ligand obstructed the coordination-step of the monomer and the electron-transfer-step from the coordinated monomer to the cupric ion. The polymerization of the mixture of XOH and o-cresol with Cu-PVP as catalyst was saturated at a higher conversion, and the yield and the molecular weight of the polymer obtained were larger than in the cases where the Cu-pyridine or the Cu-γ-picoline complex systems were used as catalysts. XOH is preferentially activated by the Cu-PVP catalyst because its oxidation potential is lower, thus the effect of the PVP ligand may be observed.XOH was polymerized by the swelled Cu-PVP complex as a heterogeneous catalyst in benzene or a benzene containing mixture of solvents. The catalyst was recovered by filtration in a high yield and re-used repeatedly. Cu-PVP complexes are relatively stable toward alkali because of their chelate structure. The polymerization was accelerated 3 to 5 times in alkaline solution, and the side-reaction was suppressed.
    Additional Material: 7 Ill.
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  • 9
    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: Die katalytische Aktivität bei der oxidativen Polymerisation von 2,6-Dimethylphenol (8) der folgenden halbleitenden organischen polymeren Metallkomplexe wurde untersucht: polymere Komplexe, die gleichzeitig Bis(äthylen-1,2-dithiolo)Cu(II)- oder Fe(III)-Komplexe und Cu(II)-Phthalocyanin-Strukturen (3a-c) enthalten bzw. die gleichzeitig Bis(äthylen-1,2-dithiolo)Cu(II)- oder Fe(III)-Komplex- und Hemiporphyrazin-Strukturen (5a-c) aufweisen, und Koordinationskomplexe, die sich aus Dimercaptomaleinsäuremonoamid (7) aufbauen lassen. Es wurde gefunden, daß eine Suspension der unlöslichen polymeren Cu-Komplexe vom Typ 3 in Gegenwart von Sauerstoff die oxidative Polymerisation bei Raumtemperatur katalysiert und daß Poly[oxy(2,6-dimethyl-1,4-phenylen)] (9) in sehr guter Ausbeute entsteht. Polymere Komplexe vom Typ 5 waren für sich allein inaktiv. Eine wesentlich erhöhte Aktivität zeigten die polymeren Komplexe vom Typ 3 und 5 in Gegenwart von wenig Cu(II)-Pyridin-Komplex in Pyridin-Lösung. (Die zugesetzten Mengen waren so niedrig, daß Cu(II)-Pyridin allein nur eine geringe Aktivität aufweis.) Polymere Komplexe mit Bis(äthylen-1,2-dithiolo)Fe(III)-Strukturen waren auch in Anwesenheit des Cu(II)-Pyridin-Komplexes inaktiv.
    Notes: In the oxidative polymerization of 2,6-dimethylphenol (8) the catalytic activities of the following semiconducting organic polymeric metal complexes were studied: polymeric complexes containing bis(ethylene-1,2-dithiolato)Cu(II) or Fe(III) complexes and copper(II) phthalocyanine structures (3a-c), catalysts consisting of bis(ethylene-1,2-dithiolato)-Cu(II) or Fe(III) complex structures and hemiporphyrazine type structures (5a-c), and also polymers containing a copper complex of dimercaptomaleic acid monoamide (7). It was found that a suspension of the insoluble bis(ethylene-1,2-dithiolato)Cu(II) polymeric complexes of type 3 catalyzes the polymerization in the presence of oxygen in pyridine at room temperature producing poly[oxy-(2,6-dimethyl-1,4-phenylene)] (9) in very good yields. Polymeric complexes of type 5 were inactive by themselves. However, we showed that bis(ethylene-1,2-dithiolato)Cu(II) polymeric complexes of both the 3 and 5 type possess great activities if they are used in the presence of small amounts of copper(II)-pyridine complex in pyridine solution (the chosen concentration was so low that the Cu(II)-pyridine complex alone had only a small activity). Bis(ethylene-1,2-dithiolato)Fe(III) complexes of both the 3 and 5 type were inactive even in the presence of the Cu(II)-pyridine complex.
    Additional Material: 5 Tab.
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  • 10
    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: Wird der unlösliche polymere Komplex 1, der Bis(äthylen-1,2-dithiolo)Cu(II) und Cu(II)Phthalocyanin-Strukturen aufweist, mit einer Pyridinlösung niedriger Konzentration an Kupfer(II)-Pyridin Komplex behandelt, erhält man ein Filtrat mit hoher katalytischer Aktivität für die oxidative Polymerisation des 2,6-Dimethylphenols. Dabei wird der polymere Komplex partiell zersetzt und damit partiell gelöst. Die katalytische Wirkung des gelösten Teils des Komplexes 1 wurde untersucht. Dieses gemischte Katalysatorysystem aus Cu(II)Py und dem gelösten Teil von 1 ist unter den hier untersuchten Bedingungen 6-50fach aktiver als der Cu(II)Py-Komplex allein.
    Notes: If an insoluble polymeric complex 1 which possesses both the bis(ethylene-1,2-dithiolato)Cu(II) a Cu(II)phthalocyanine type structure is treated with a pyridine solution of the Cu(II)-pyridine complex in a low concentration, the filtrate obtains a high activity for the oxidative polymerization of 2,6-dimethylphenol. This might be due to a partial decomposition followed by a partial dissolution of the polymer complex. The catalytic behaviour of the soluble part of the polymeric complex 1 was studied. The activity of this mixed catalyst system consisting of Cu(II)Py and the soluble part of 1 was found to be 6-50times higher than that of Cu(II)Py alone under the applied conditions.
    Additional Material: 5 Ill.
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