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  • Electronic Resource  (6)
  • Polymer and Materials Science  (3)
  • Enantiomeric olefins  (2)
  • 65.50 + m  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of the spin-Peierls transition in CuGeO3 (1995)
    Springer
    The European physical journal 98 (1995), S. 167-169 
    Details
    ISSN: 1434-6036
    Keywords: 65.50 + m ; 75.10.Jm ; 75.50.Ee
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present an investigation of the spin-Peierls transition atT SP=14.5 K in polycrystalline CuGeO3 through specific-heat and thermal-expansion measurements. Clear second-order phase-transition anomalies are found in both properties atT SP, although only a small entropy of S≈0.1 Rℓn2 is released at the transition. Most of the entropy is released atT SP〈T〈150 K, where the temperature dependence of the magnetic contribution to the specific heat as well as the thermal expansion exhibit extrema atT *≈40 K. These are caused by one-dimensional antiferromagnetic fluctuations along the Cu chains, possibly accompanied by structural fluctuations. Using Ehrenfest's relation, a hydrostatic pressure coefficient (∂T SP/∂p)p→0 ≈ (0.45±0.06) K/kbar is derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01324522
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  • 2
    Electronic Resource
    Electronic Resource
    Preparative LC separation and isolation of enantiomerically pure olefins (1984)
    Springer
    Chromatographia 18 (1984), S. 119-124 
    Details
    ISSN: 1612-1112
    Keywords: Enantiomeric olefins ; Platinum complexes ; Ligand exchange ; Preparative gas chromatography ; Preparative column-liquid chromatography ; Column switching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Diastereomer formation by the reaction of chiral olefins with optically active platinum complexes followed by LC separation of the diastereomers, and on-line or off-line release of the olefins from the complexes by ligand exchange yield optically pure enantiomers. The 100% dextrostetatory enantiomer of exo-2-vinylbicyclo[2.2.1]heptane (vinylnorbornane) could be isolated by an off-line method and was used for polarimetric measurements before and after preparative scale gas chromatographic clean-up. The initial valuable platinum complex could be easily recovered without loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02258766
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  • 3
    Electronic Resource
    Electronic Resource
    Liquid chromatography with and of platinum complexes (1981)
    Springer
    Chromatographia 14 (1981), S. 559-566 
    Details
    ISSN: 1612-1112
    Keywords: Reversed phase HPLC ; Normal phase HPLC ; Platinum complexes in mobile phase ; Enantiomeric olefins ; Diasteromeric complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Reversed-phase, high-performance liquid chromatography (HPLC) on chemically bonded C18-phases with acetonitrile-water mobile phases, contianing platinum complexes like Zeise's salt C2H4PtCl3, the amine derivative C2H4−PtCl2−NH2−CH(CH3)−C6H5 or the amino acid compound C2H4−PtCl−OOC−CH(N(CH3)2)−C6H5 by analogy with argentation chromatography, was used to increase selectivity for the separation of various types of olefins, amines and heterocyclic compounds. On the other hand, normal-phase adsorption chromatography on silica with n-heptane, dichloromethane and n-propanol mobile phases proves to be an ideal tool for the analytical and preparative separation of diastereomeric platinum complexes of olefins, introduced by Gil-Av, that can be easily preparedin vitro, by the reaction of C2H4−PtCl−OOC−CH(N(CH3)2)−C6H5 with optically active olefins in CH2Cl2. The preparation of the intitial complex as well as its application to the separation of several interesting types of enantiomeric olefins is described and discussed. The number and amount of separable diastereomers formed by the above reaction is strongly influenced by sterical effects. By comparison of the chromatographic pattern of either racemic or partly racemic mixtures, it is possible to decide, which peaks belong to one or the other enantiomeric form of the olefin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262884
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  • 4
    Electronic Resource
    Electronic Resource
    Experimentelle Untersuchung des statistischen Größeneinflusses im Dauerschwingversuch an ungekerbten Stahlproben (1975)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 52-54 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Experimental Investigation of the Statistical Size-Effect in Fatigue Tests with Unnotched Specimens.In constant-load-fatigue-tests with unnotched specimens of different lengths, the statistical effect of specimen's size in probability of lifetime to fracture was determined.
    Notes: Im einstufigen Dauerschwingversuch an ungekerbten Proben mit unterschiedlichen Meßlängen konnte der statistische Einfluß der Probengröße auf deren Bruchwahrscheinlichkeit experimentell nachgewiesen werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19750060204
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  • 5
    Electronic Resource
    Electronic Resource
    163. Die diskontinuierliche Rektifikation azeotroper Gemische in der betrieblichen Praxis (1994)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1257-1258 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306609164
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  • 6
    Electronic Resource
    Electronic Resource
    Produktbereiche bei der Rektifikation homogenazeotroper Mehrstoffgemische (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 793-793 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330640939
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