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  • Polymer and Materials Science  (81)
  • EXAFS  (3)
  • Wiley-Blackwell  (81)
  • Springer  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Structure of molybdenum oxide clusters prepared in zeolite cages (1993)
    Springer
    Catalysis letters 20 (1993), S. 49-57 
    Details
    ISSN: 1572-879X
    Keywords: Molybdenum oxide ; molybdenum hexacarbonyl ; zeolite ; tungsten hexacarbonyl ; EXAFS ; XPS ; photooxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Molybdenum hexacarbonyl entrapped in NaY zeolite was oxidized with molecular oxygen by UV-irradiation at room temperature or by thermal treatment at 343–373 K. Both oxidation procedures resulted in the identical molybdenum(VI) oxide; molybdenum dimer species (Mo-Mo distance: 0.321 nm). The Mo-Mo bonding of the oxide species was degraded on an evacuation at 673 K, while it was considerably stable in the presence of gaseous oxygen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772596
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  • 2
    Electronic Resource
    Electronic Resource
    Characterization of bimetallic surface structures of highly active Rh-Sn/SiO2 catalysts for NO-H2 reaction by EXAFS (1993)
    Springer
    Catalysis letters 20 (1993), S. 15-22 
    Details
    ISSN: 1572-879X
    Keywords: EXAFS ; Rh-Sn/SiO2 ; NO-H2 reaction ; NO dissociation ; bimetallic ensemble structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Rh-Sn/SiO2 catalysts prepared by the reaction of (CH3)4Sn with Rh metal particles supported on SiO2 have remarkably high activities for NO-H2 reaction and NO dissociation. The bimetallic surface structure of Rh-Sn/SiO2 composed of an isolated Rh atom surrounded by six Sn atoms, is presented by Rh K-edge and Sn K-edge EXAFS, FT-IR, TEM and CO adsorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00772593
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of supported gold catalysts from gold complexes and their catalytic activities for CO oxidation (1996)
    Springer
    Catalysis letters 42 (1996), S. 15-20 
    Details
    ISSN: 1572-879X
    Keywords: supported gold catalysts ; CO oxidation ; gold monomer and cluster ; EXAFS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A phosphine-stabilized mononuclear gold complex Au(PPh3)(NO3) (1) and a phosphine-stabilized gold cluster [Aug(PPh3)8](NO3)3 (2) were used as precursors for preparation of supported gold catalysts. Both complexes 1 and 2 supported on inorganic oxides such as α-Fe2O3, TiO2, and SiO2 were inactive for CO oxidation, whereas the 1 or 2/ oxides treated under air or CO or 5% h2/Ar atmosphere were found to be active for CO oxidation. The catalytic activity depended on not only the treatment conditions but also the kinds of the precursor and the supports used. The catalysts derived from 1 showed higher activity than those derived from 2. α-Fe2O3 and TiO2 were much more efficient supports than SiO2 for the gold particles which were characterized by XRD and EXAFS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00814461
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  • 4
    Electronic Resource
    Electronic Resource
    On the nonplanarity of the peptide groups in the ω-helix of polypeptides (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 891-893 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140417
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  • 5
    Electronic Resource
    Electronic Resource
    X-ray diffraction studies on the cross-β form of poly (O-benzyl-L-serine) (1990)
    New York : Wiley-Blackwell
    Biopolymers 29 (1990), S. 1125-1128 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Poly(O-benzyl-L-serine) of degree. polymerization 90 in oriented film cast from dichloroacetic acid (DCA) solution yielded the x-ray patterns of the intramolecular cross-β form, in which the extended segments stand upward and downward to the surfaces of a thin film. These x-ray photographs further suggest that residual solvent molecules are bound to the polymer, and it may provide an important clue in understanding the nature of the cross-β conformation in a diluted DCA solution.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360290802
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  • 6
    Electronic Resource
    Electronic Resource
    Functional monomers and polymers, 109Part 108: Y. Suda, Y. Inaki, K. Takemoto, J. Polym. Sci., Polym. Chem. Ed., in press.. Asymmetric inclusion polymerization of (E)- and (Z)-2-methyl-1,3-pentadiene in apocholic acid canalsDedicated to Professor H. J. Cantow on the occasion of his 60th birthday (1983)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 184 (1983), S. 1771-1779 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Asymmetric inclusion polymerization of the prochiral monomers (E)- and (Z)-2-methyl-1,3-pentadiene (3a and 3b), in apocholic acid (2) canals was performed under various conditions to find out the factors controlling the asymmetric induction during the polymerization. Ozonolysis of the resulting polymers and subsequent transformation of the resulting 2-methyl-4-oxovaleric acid (4) into its 2,4-dinitrophenylhydrazone revealed the predominant formation of the (R)-absolute configuration. The optical yield was high in the initial stage of the polymerization and decreased gradually as the polymerization proceeds. To obtain a high optical yield the polymerization was performed at low temperature applying a 1:1 mole ratio monomer/apocholic acid, and an irradiation dose 〈 1 Mrad. The optical yield amounted to 36% at maximum, which is the highest value obtained so far in the asymmetric polymerization of 1,3-pentadiene derivatives using canal complexes or other known methods.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1983.021840902
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  • 7
    Electronic Resource
    Electronic Resource
    Soluble cyclopentadienylated polymers (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 473-481 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers from styrene and a mixture of p- and m-chloromethylstyrene were reacted with sodium cyclopentadienide in THF and precipitated in methanol at temperatures lower than -20°C to obtain soluble cyclopentadienylated polymers. Due to extensive gelation, the content of cyclopentadienyl groups could not be increased to more than 4 mol-% except with extremely low molecular weight polymers. An improved method, in which the copolymer was cyclopentadienylated in the presence of metallic sodium, gave soluble polymers with up to 29 mol-% cyclopentadienyl groups. Pendant cyclopentadienyl groups undergo Diels-Alder/retro-Diels-Alder addition to give thermoreversible cross-linked polymers. The amount of gel fraction of a 4 mol-% cyclopentadienylated polymer as a function of the heating time was examined in the temperature range of 40-80°C. The DSC curve of a 29 mol-% cyclopentadienylated polymer showed an exothermic peak due to the Diels-Alder reaction and an endothermic peak starting around 390°C, a temperature higher than that found for the degradation of polystyrene.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860304
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  • 8
    Electronic Resource
    Electronic Resource
    Syntheses and polymerizations of dialkyldiallylammonium bromides as vesicles in solution (1985)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 186 (1985), S. 923-931 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dialkyldiallylammonium salts 1a-c were prepared by quaternization of diallylamine with alkyl bromides and their polymerizability as oriented molecular assemblies in aqueous solution is discussed. Thin films of those ammonium salts on the glass wall were incubated by adding a phosphate buffer solution to yield giant spherical vesicles with diameters ranging from 10 to 100 μm. When large amounts of the ammonium salt were applied, it was necessary to add more than 5 mol-% of cholesterol in order to stabilize the resulting giant vesicles. By ultrasonication of the film-aqueous solution system, much smaller vesicles with diameters ranging from 0,03 to 0,2 μm were obtained. The stabilizing effect of cholesterol addition to the system of the small vesicles is similar to that observed for the giant vesicles. Under an inert atmosphere, the vesicles in aqueous solution were polymerized by ultraviolet irradiation. From the results of TEM and NMR spectroscopy, it was concluded that the molecules were polymerized in the vesicles without changing the profile of molecular assembly during an irradiation of 6 h. However, when the ammonium salts were dissolved homogeneously in degassed benzene, the ultraviolet irradiation polymerization did not proceed beyond a conversion of 5% under the same conditions.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1985.021860504
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  • 9
    Electronic Resource
    Electronic Resource
    The cyclo-copolymerization of diallyl compounds and sulfur dioxide, 5.Part 4: cf.1. Copolymerization of some 4-substituted 1,6-heptadiene derivatives with sulfur dioxide (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 289-315 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers of sulfur dioxide with N-substituted 4-(1,6-heptadiene-4-yl)pyridinium chlorides and bromides (1) and N-substituted 4-(3-butenyl)pyridinium chlorides and bromides, and some other 1,6-heptadiene derivatives 3 substituted in 4-position were prepared. The effects of the copolymerization conditions on the conversions and viscosities of the copolymers were studied and their structures by elemental analyses, IR and 1H NMR spectroscopy. The thermal stabilities of the copolymers were also examined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021780202
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  • 10
    Electronic Resource
    Electronic Resource
    The cyclo-copolymerization of diallyl compounds and sulfur dioxide, 4Part 3: cf.3.. 4-(4-pyridyl)-1,6-heptadiene hydrochloride and sulfur dioxide (1975)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 176 (1975), S. 1289-1305 
    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: Copolymere von 4-(4-Pyridyl)-1,6-heptadienhydrochlorid (1) und 4-(1-Buten-4-yl)pyridinhydrochlorid (2) mit Schwefeldioxid wurden dargestellt und ihre Eigenschaften untersucht. Die Auswirkungen der Copolymerisationsbedingungen auf Ausbeuten und Viskositäten der erhaltenen Copolymere wurden untersucht, sowie ihre Struktur mit Hilfe der Elementaranalysen, IR-, 1H- und 13C-NMR-Spektroskopie.
    Notes: Copolymers of 4-(4-pyridyl)-1,6-heptadiene hydrochloride (1) and 4-(1-buten-4-yl)pyridine hydrochloride (2) with sulfur dioxide were prepared and their properties were investigated. The effects of the copolymerization conditions on the yields and viscosities of the obtained copolymers were studied. Their structures were studied by elemental analyses, IR, and 1H- and 13C-NMR spectroscopy.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1975.021760506
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