ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 11
    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.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 12
    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: Der rot-violette Komplex, der sich aus teilverseiftem Polyvinylacetat und Jod in Gegenwart von Kaliumjodid bildet, wurde mit der Benesi-Hildebrand-Methode untersucht. Der molare Absorptionskoeffizient des Komplexes beim Absorptionsmaximum (488 nm) betrug 4,74.104l/(mol cm) bei 10°C und fiel mit steigender Temperatur. Die Konzentration der aus Vinylacetat resultierenden Bausteine (Acetoxyäthylen-Bausteine), die an der Komplex-Bildung mit Jod teilnehmen können, lag unter 1% der Gesamtmenge an Acetoxyäthylen-Bausteine. Die Enthalpie- (ΔH) und Entropie-Änderung (ΔS) wurden zu -45,01 kJ mol-1 (-10,75 Kcal/mol) bzw. -48,40 J mol-1 K-1 (-11,56 cal mol-1 K-1) bei 15°C bestimmt.
    Notes: The red-violet complex which was formed from partially saponified poly(vinyl acetate) and iodine in the presence of potassium iodide was investigated by the Benesi-Hildebrand method. The molar absorption coefficient of the complex at the absorption maximum (488 nm) was found to be 4,74.1041/(mol cm) at 10°C and to decrease with rising temperature. The concentration of units resulting from vinyl acetate (acetoxyethylene units), which can take part in the complex formation with iodine, was below 1% of the total content of acetoxyethylene units in the polymer. The changes of enthalpy (ΔH) and entropy (ΔS) were found to be -45,01 kJ mol-1 (-10,75 Kcal/mol) and -48,40 J mol-1 K-1 (-11.56 cal mol-1 K-1) at 15°C, respectively.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 13
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 101-104 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chelating thiolato-manganese complexes of 1,2-dimercaptoethane (DME), 3,4-dimercaptotoluene (DMT), cystein (Cys), β-mercaptoethyl alcohol (ME), β-mercaptoethylamine (MEA), and mercaptoacetic acid (MAA) showed high activity for the oxidative polymerization of 2,6-dimethylphenol (DMP) as heterogeneous catalysts. The complexes caused only C—O coupling to give poly[oxy(2,6-dimethyl-1,4-phenylene)] selectively. From the reaction in the absence of oxygen it was concluded that oxygen acts as electron-accepting ligand. The much higher activity of DMT complex, compared with that of DME complex, was considered to be due to the π-accepting character of the ligand. The MEA complex which showed especially strong spin-spin interaction in the ESR spectrum exhibited also high activity.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 14
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 2419-2423 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thin films (thickness 0,3 μm) of a mixture of phthalocyaninatozinc(II) (1) and poly(1-vinylcarbazole) (2) are prepared by coating from a solution on ITO glass. The blue coloured films are investigated in an electrochemical cell under irradiation with visible light. In the presence of dioxygen from air the films exhibit an intensive cathodic photocurrent. The action spectrum of the photocurrent corresponds to the absorption spectrum of the phthalocyanine. The results show a device which can be switched by air and visible light.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 15
    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.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 16
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 3401-3410 
    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 verschiedener Bis(1,2-dicyanoäthylen-1,2-dithiolato)-Metall-Komplexe (1a-f) wurde untersucht. Es wurde gefunden, daß Kupferbis(1,2-dicyanoäthylen-1,2-dithiolato)cuprat(2-) (1a) die oxidative Polymerisation des 2,6-Dimethylphenols in Anwesenheit von molekularem Sauerstoff katalysiert. Unter gewissen Polymerisationsbedingungen ist dieser Katalysator viel aktiver als der bekannte Kupfer(II)-Pyridin-Komplex.
    Notes: The catalytic activities of various bis(1,2-dicyanoethylene-1,2-dithiolato)metal (1a-f) complexes were investigated. It was found that copper bis(1,2-dicyanoethylene-1,2-dithiolato)cuprate(2-) (1a) catalyzes the oxidative polymerization of 2,6-dimethylphenol in the presence of molecular oxygen. At some polymerization conditions this catalyst is much more active than the well-known copper(II)-pyridine complex.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 17
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 723-731 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It was found that a copper complex of toluene-3,4-dithiol (Cu-TDT) catalyzes the oxidative polymerization of 2,6-dimethylphenol (1), and the catalytic behavior was studied. The activity of the Cu-TDT is higher than that of the known copper(II)-pyridine complex. The higher the pyridine content in the solvent mixture pyridine/o-dichlorobenzene, the higher is the activity of Cu-TDT. Cu-TDT loses its activity gradually in pyridine solution, however, about 40% of its activity remains even after 150h. The reasons for the high activity are discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 18
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 1277-1283 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: It was found that the photoredox system, dye/poly(iminoethylene) (PEI) induces a remarkably higher photopotential than the corresponding dye/monoamine system. The relationship between the photopotential induced by thionine (TH)/PEI and the number of amino or imino groups in the amine molecule is characterized by an alternating pattern. From the dependencies of the photopotential and the ionic species of the amine on pH, it was concluded that the active species of the amine is the half-protonated one. As a possible mechanism for the high photopotential induced by the polyamine system, an interaction between the dye and the half-protonated species is proposed, based on the bifunctional behavior of the adjacent protonated and unprotonated imino groups of PEI.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 19
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2431-2438 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A new type of photoredox polymer with incorporated thionine, (7-amino-3H-phenothiazin-3-iminium chloride). (TH) and alkylenepolyamine groups was prepared by the reaction of poly(acrylic acid) with TH and alkylenepolyamines such as ethylenediamine (en), tetraethylenepentamine (3,6,9-triazaundecane-I,II-diamine), (tetraen) and poly(iminoethylene). The photoredox polymers were able to induce photopotential in aqueous solution in the absence of any other redox reagents. The polymers from TH with on and with tetraen induced photopotentials of 180 mV and 167 mV, respectively. The photopotential of the former system was much higher than that of the system, TH/en. The induced photopotential of the polymer systems did not depend so much upon the mole ratio [en]/[TH] of the pendent groups, while the photopotential of the TH/en system was strongly dependent upon [en]/[TH]. Effects of the polymer structure were discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 20
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 89-99 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: New polynuclear manganese-thiolato complexes were prepared by reaction of Mn ions with chelating mercapto compounds, such as 1,2-dimercaptoethane (DME), 3,4-dimercaptotoluene (DMT), cystein (Cys), β-mercaptoethyl alcohol (ME), β-mercaptoethylamine (MEA), and mercaptoacetic acid (MAA). Potassium permanganate formed stable complexes with DME, DMT and Cys. The complexes of ME, MEA and MAA were prepared by the reaction with manganous chloride. The temperature dependencies of the magnetic susceptibility of the complexes, except Cys, obeyed the Curie-Weiss law, indicating strong antiferromagnetic interaction between the spins on the Mn ions. The valence of the DME and DMT complexes was calculated to be IV to V, and that of the Cys, ME, MEA and MAA complexes to be II to IV. ESR spectra of the DME and DMT complexes showed broad singlet absorptions, while those of ME, MEA and MAA complexes exhibited narrow Lorentzian singlets, both types indicating strong interaction between the spins. These results and the composition indicated polynuclear complexes containing μ-oxo (DME and DMT), μ-chloro or μ-thiolato (ME, MEA and MAA) structure, while Cys gave mononuclear complex.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...