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  • 1
    Digitale Medien
    Digitale Medien
    4,4'-[1,6-Hexanediylbis(oxy)]bisbenzaldehyde (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 3234-3236 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270196009973
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Thermodynamics and X-ray studies of 2-alcohol monolayers: Two-dimensional phase diagrams (2000)
    Springer
    The European physical journal 3 (2000), S. 63-70 
    Details
    ISSN: 1292-895X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Monolayers of short chiral alcohols at the water surface provide a simple model for chiral interactions between molecules. This paper is focused on alcohols with two particular chain lengths, 2-tridecanol (2C13) and 2-tetradecanol (2C14). Thermodynamic and structural parameters were measured, varying the ratio of left and right enantiomers within monolayers. The evolution of melting temperatures and entropies is not consistent with the formation of a racemate. Grazing X-ray diffraction, revealing the molecular stacking, shows clearly that there is no chiral separation. In these two compounds molecules spontaneously self-assemble at the water surface as a solid solution. The chiral polar head-group is partially screened by the chain thermal disorder of the rotator phase. 2-tridecanol exhibits a hexagonal rotator phase stable in time and independent of temperature. Experiments performed close to the melting point show pre-transitional effects for mixtures different from 50/50. This broadening of the peak can be related to defects in 2D crystals, phenomena already observed for the melting of some 3D systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s101890070042
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  • 3
    Digitale Medien
    Digitale Medien
    Thermodynamics and X-ray studies of 2-alcohol monolayers at the air water interface (1998)
    Springer
    The European physical journal 1 (1998), S. 189-196 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 61.10.-iX-ray diffraction and scattering - 64.70.Dv Solid-liquid transitions - 68.10.CrSurface energy (surface tension, interface tension, angle of contact, etc.)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We investigate monolayers of 2-alcohols (2-C9 to 2-C16) obtained by placing a drop of pure alcohol at the water surface. These alcohols are chiral molecules and we study the racemic mixtures. By ellipsometry and surface tension measurements we are able to characterize the 2D crystallization-melting transition with temperature. We find a first order transition. Using X-ray under grazing incidence we show that the racemic mixture crystallizes at 2D on a hexagonal cell. We find a parity effect on the lateral pressure at the transition and on the stability of the Bragg peak. We compare all results with those observed for 1-alcohols.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100510050170
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