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  • 1975-1979  (7)
  • 1978  (7)
  • Inorganic Chemistry  (4)
  • Physics  (3)
  • Nuclear reactions
  • 1
    Electronic Resource
    Electronic Resource
    Phosphorhaltige Kohlenhydrate, XVII: Untersuchung der Hydrierung ungesättigter Glycosylphosphonate. Anomerer Effekt und A-Wert der Dimethylphosphono-Gruppe (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3325-3335 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorus-containing Carbohydrates, XVII: Studies on the Hydrogenation of Unsaturated Glycosylphosphonates. Anomeric Effect and A-Value of the Dimethylphosphono GroupBy hydrogenation unsaturated glycosylphosphonates of type 1 give rise to the formation of 2,3-dideoxyglycosylphosphonates 2 and 2,3,4-trideoxyglycosylphosphonates 3. Their product ratio depends on configuration and conformation of the educts 1a-f. 1H and 13H and 13C NMR data permit an assigment of the anomers of the hydrogenated glycosylphosphonates. For the one-bond coupling constant between 13C-1 and 31P the correlation 1JC, Peq 〉 1JC, Pax is valid, which exhibits a difference of 19-23 Hz. The unsaturated glycosylphosphonates show deviations from Hudson's isorotation rule. In dimethyl cis-4-methyl-1-cyclohexanephosphonate (9) the A-value of the dimethylphosphono group has been determined to 8.34 kJ/mol. The ratio of conformers in 3a leads to an anomeric effect of the dimethylphosphono group of 2.33 kJ/mol.
    Notes: Ungesättigte Glycosylphosphonate vom Typ 1 liefern bei der Hydrierung außer 2,3-Didesoxyglycosylphosphonaten 2 auch 2,3,4-Tridesoxyglycosylphosphonate 3. Das Produktverhältnis ist von Konfiguration und Konformation der Ausgangsprodukte 1a-f abhängig. 1H- und 13C-NMR-Daten erlauben eine Anomerenzuordnung der hydrierten Glycosylphosphonate. Für die 13C-31P-Direktkopplung an C-1 gilt 1JC, Peq 〉 1JC, Pax mit einer Differenz von 19-23 Hz. Die ungesättigten Glycosylphosphonate zeigen Abweichungen von der Hudsonschen Regel. Am Dimethyl-cis-4-methyl-1-cyclohexanphosphonat (9) wurde der A-Wert der Dimethylphosphono-Gruppe zu 8.34 kJ/mol bestimmt. Aus der Konformerenverteilung bei 3a ergibt sich der anomere Effekt der Dimethylphosphono-Gruppe zu 2.33 kJ/mol.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781111006
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  • 2
    Electronic Resource
    Electronic Resource
    Four-center photopolymerization. A heterogeneous topochemical solid-state reaction (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1365-1379 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The four-center solid-state photopolymerization of distyrylpyrazine (DSP) and of 2,6-naphthalene bis(acrylic acid-2,4-dichloro phenyl ester) (NBA-DCP) was investigated by x-ray and microscopic techniques. In both cases the polymer grows as a separate product phase topotactically well arranged with respect to the monomer matrix. In the case of polymerization of DSP the space group of the monomer (Pbca) is not maintained but the polymer phase has space group P21ca. Nucleation and growth of the polymer phase was observed by light and electron microscopy. Nucleation occurs at defect sites. The polymer grows at different rates in different crystallographic directions which were identified by electron diffraction in the case of DSP. Polymerization thus occurs in the transition region between monomer crystal and product phase and not in the bulk of the crystal so that the four-center-type photopolymerization is best described as a heterogeneous solid-state reaction.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160803
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  • 3
    Electronic Resource
    Electronic Resource
    Ion clustering in a butadiene, styrene, 4-vinylpyridine terpolymer crosslinked by coordination with iron(III) chloride (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 569-581 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A butadiene, styrene, 4-vinylpyridine terpolymer has been crosslinked by coordination of the pyridine groups with iron chloride. The distribution and structure of the iron complexes have been studied. Electron microscopy has given evidence of clustering of the iron complexes. The size distribution of these clusters has been evaluated by small-angle x-ray and neutron scattering. Mössbauer spectroscopy and magnetization measurements have shown the presence of three different kinds of iron complexes: (a) complexes with a speromagnetic structure in the clusters previously found, (b) dimers with antiferromagnetic coupling, and (c) quasi-isolated complexes with weak ferromagnetic coupling. The percentages of these different iron complexes have been measured.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160401
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  • 4
    Electronic Resource
    Electronic Resource
    On the structure of glassy polymers. VI. Electron microscopy of polycarbonate, poly(ethylene terephthalate), poly(vinyl chloride), and polystyrene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 2005-2014 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: High-resolution electron microscopy studies have been carried out on four glassy polymers examined in previous small-angle x-ray scattering (SAXS) investigations. The polymers include polycarbonate, poly(ethylene terephthalate), poly(vinyl chloride), and polystyrene. For all four polymers, both bright field and dark-field observations indicate the general absence of microstructural features of a size down to the resolution limit of the electron microscope. Only “pepper and salt” features on a scale ca. 5 Å are seen as characteristic of the structures. These features reflect simple interferences as the resolution limit is approached, and are seen for single crystal and oxide glasses as well as for the polymers. The present results, taken together with structural information from light scattering, SAXS, and small-angle neutron scattering, indicate that glassy polymers should be regarded as having rendom structures. The combined results are inconsistent with heterogeneous microstructures having regions of locally high order present in large volume fractions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180161110
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Chloro- und Bromo-Indate (III). A3In2Cl9 (A = Cs, Rb, In, Tl) und Cs3In2Br9-x Clx (x = 0, 3, 6, 7, 8) (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 140-146 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chloro- and Bromo-Indates (III). A3In2Cl9 (A = Cs, Rb, In, Tl) and Cs3In2Br9-xClx (x = 0, 3, 6, 7, 8)A3IIn2Cl9 (A = Cs, Rb, Tl, In) and Cs3In2Br9-xClx (x = 7, 8) crystallize isotypic with Cs3Tl2Cl9. The crystal structure has been refined to R = 0.039 by means of single crystals of Cs3In2Cl9. Cs3In2Br9 and the mixed crystals Cs3In2Br9-xClx (x = 3, 6, 7) belong to the Cs3Cr2Cl9 type of structure; Cs3In2Br2Cl7 is dimorphic.
    Notes: A3IIn2Cl9 (A = Cs, Rb, Ti, In) sowie Cs3In2Br9-x Clx (x = 7,8) kristallisieren isotyp mit Cs3Tl2Cl9. Die Kristallstruktur wurde an Einkristallen von Cs3In2Cl9 bis R = 0,039 verfeinert. Cs3In2Br9-xClx (x = 3, 6, 7) gehören dem Cs3Cr2Cl9-Typ an; Cs3In2Br2Cl7 ist dimorph.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784450117
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  • 6
    Electronic Resource
    Electronic Resource
    Neue Vernetzung planarer Polyeder um Pd2+ in PbPdO2 (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 442 (1978), S. 26-30 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A New Cross Linkage of Planare Polyhedra around Pd2+ in PbPdO2PbPdO2 was prepared and investigated by X-ray single crystal data: a = 946.0, b = 546.3, c = 466.0 pm; Space group D282h-Imma. Pd2+ has a square planare surrounding of O2- and Pb2+ shows the same configuration in respect to the O2- neighbour analogous to the red PbO.
    Notes: Die Verbindung PbPdO2 wurde dargestellt und ihr bisher unbekannter Aufbau untersucht. Einkristallröntgendaten ergaben a = 946,0 b = 546,3 c = 466,0 pm, Raumgruppe D282h-Imma. Pd2+ besitzt eine quadratische planare Koordination von O2-, Pb2+ zeigt die gleichen Polyeder wie in rotem PbO.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784420104
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  • 7
    Electronic Resource
    Electronic Resource
    Halogen-Elpasolithe. III. Kubische und hexagonale Elpasolithe vom Typ Cs2LiMIIICl6 (MIII = Sc, Y, La-Nd, Sm-Lu, V, Cr, In) (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 445 (1978), S. 147-151 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Halogeno-Elpasolites. III. Cubic and Hexagonal Chloro-Elpasolites: Cs2LiMIIICl6Chloro-Elpasolites of Cs2LiMIIICl6 formula type adopt, due to the ionic radius of M3+, several crystal structures: Cs2LiMCl6 (M = Y, La—Nd, Sm—Yb) are isotypic K2NaAlF6 Cs2LiScCl6 and Cs2LiInCl6 with Cs2NaCrF6, Cs2LiVCl6 and Cs2LiCrCl6 with Cs2LiGaF6. Cs2LiLuCl6 is dimorphic: several temperature-dependent transitions between HT-K2LiAlF6 and K2NaAlF6 structure types occur.
    Notes: Chlor-Elpasolithe vom Typ Cs2LiMIIICl6 gehören, abhängig vom Ionenradius r(M3+), verschiedenen Strukturtypen an: Cs2LiMCl6 (M = Y, La—Nd, Sm—Yb) dem kubischflächenzentrierten K2NaAlF6-Typ, Cs2LiScCl6 und Cs2LiInCl6 sind isotyp mit Cs2NaCrf6, Cs2LiVCl6 und Cs2LiCrCl6 mit Cs2LiGaF6; Cs2LiLuCl6 ist dimorph (mehrere temperaturabhängige Übergänge zwischen dem HT-K2LiAlF6- und dem K2NaAlF6-Typ).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784450118
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