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  • Structure  (4)
  • Chemistry
  • General Chemistry
  • Springer  (4)
  • 1995-1999  (3)
  • 1980-1984  (1)
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  • 1995-1999  (3)
  • 1980-1984  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 127 (1996), S. 1215-1220 
    ISSN: 1434-4475
    Keywords: Coordination of As(III) ; Structure ; Stereoisomeres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Arsenictris(trifluoroacetate) (1) crystallizes monoclinic in the space group Cc witha=1229.3,b=1697.9,c=1243.5 pm, β=110.01°, andZ=8. The trifluoroacetic acid ions acts as chelating ligands. Additionally they are bridging crystallographic independent molecules. As has a coordination number of 3+3(+2). The unit cell contains two sets of chirameres.
    Notes: Zusammenfassung Arsen-tris(trifluoracetat) (1) kristallisiert monoklin in der Raumgruppe Cc mita=1229.3,b=1697.9,c=1243.5 pm, β=110.01° undZ=8. Die Trifluoracetatanionen fungieren gegenüber As als zweizähnige Liganden und verknüpfen die beiden kristallographisch unabhängigen Moleküle zusätzlich intermolekular. As erreicht dadurch gegenüber O die Koordinationszahl 3+3(+2). Die Elementarzelle enthält zwei Sätze von chirameren Molekülen.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 126 (1995), S. 1045-1050 
    ISSN: 1434-4475
    Keywords: Coordination of Sb(III) ; Structure ; Enantiomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The Δ isomer of (C6H5CO2)3Sb crystallizes rhombohedrally (hexagonal axes) in the space group R3 witha=1944.0 pm,c=422.3 pm, andZ=3. The molecules are stacked parallel to 001; Sb has a coordination number of 3+3 (Sb-O: 208 and 256 pm, resp.).
    Notes: Zusammenfassung Das Δ-Isomer des Antimontribenzoats kristallisiert rhomboedrisch (hexagonale Aufstellung) in der Raumgruppe R3 mita=1944.0 pm,c=422.3 pm undZ=3. Die Moleküle sind parallel zu 001 gestapelt. Sb hat gegenüber O die Koordinationszahl 3+3 (Sb-O: 208 bzw. 256 pm).
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 127 (1996), S. 461-468 
    ISSN: 1434-4475
    Keywords: Coordination of As(III) and Sb(III) ; Structure ; Enantiomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Arsen-tris(2,2-dimethylpropionate) (1) crystallizes monoclinic in the space group P21/n witha=926.2,b=2158.6,c=983.7 pm, β=94.92°, andZ=4. As has a coordination number of 3+3. Antimony tripropionate (2) crystallizes monoclinic in the space group P21/c witha=930.2,b=863.0,c=1575.2 pm, β=90.27, andZ=4. The molecules are bridged to chains; therefore, Sb reaches the coordination number 3+3 (+3).
    Notes: Zusammenfassung Arsen-tris(2,2-dimethylpropionat) (1) kristallisiert monoklin in der Raumgruppe P21/n mita=926.2,b=2158.6,c=983.7 pm, β=94.92° undZ=4. As hat gegenüber O die Koordinationszahl 3+3. Antimontripropionat (2) kristallisiert monoklin in der Raumgruppe P21/c mita=930.2,b=863.0,c=1575.2 pm, β=90.27 undZ=4. Die Moleküle sind intermolekular zu Ketten verknüpft, wodurch Sb die Koordinationszahl 3+3 (+3) erreicht.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 259 (1981), S. 611-624 
    ISSN: 1435-1536
    Keywords: Crosslinked polyethylenes ; Thermodynamics ; Eutectoid multicomponent systems ; SAXS ; Melting ; Structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Zur quantitativen Beschreibung des Schmelzens strahlenvernetzter Polyäthylene wird die Thermodynamik eutektoider Systeme modifiziert. Die Charakterisierung dieser polymeren Netzwerke wird durch Elektronenmikroskopie, Röntgenweitwinkelstreuung und DTA-Messungen vorgenommen. Die Auswertung der Experimente liefert Strukturparameter, deren Kenntnis eine quantitative Berechnung von SAXS-Messungen erlaubt. Diese Berechnung ist im Schmelzbereich nur auf der Grundlage eines Umordnungsmodells" möglich. Ein solcher Ablauf des Schmelzprozeßes kann aus den prinzipiellen Eigenschaften eutektoider Vielteilchensysteme verständlich gemacht werden.
    Notes: Summary The thermodynamics of the melting in eutectoid copolymers is successfully applied to molecular networks of polyethylene. The characterization of these crystallized systems with varying densities of crosslinks is in accord with electron microscopic observations, with WAXS-results and with calorimetric measurements, thus, allowing a quantitative description of SAXS-measurements dependent on temperature. A mechanistic interpretation of the melting process is presented which can be justified from the principle of the crystallization- and melting behaviour in eutectoid multicomponent systems. This interpretation applies equally well to eutectoid copolymers with no permanent crosslinks, thus, underlining the general validity of the theorectical approach.
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