Molecular dynamics in perfluoro-<i>n</i>-eicosane. I. Solid phase behavior and crystal structures

• Heinz Schwickert

  Institut für Physikalische Chemie, Universität Mainz, 6500 Mainz, Germany

• Gert Strobl

  Fakultät für Physik, Universität Freiburg, Hermann-Herder-Strasse 3, 7800 Freiburg, Germany

• Martin Kimmig

  Fakultät für Physik, Universität Freiburg, Hermann-Herder-Strasse 3, 7800 Freiburg, Germany

抄録

Perfluoro-n-eicosane (n-C20F42) passes through three different solid modifications, called M(T&lt;146 K), I(146&lt;T&lt;200 K), and R(T&gt;200 K). Structures of the phases M and R were characterized by x-ray scattering experiments. Crystals are built up by rectangular layers. In modification M layers are set up by arrays of right-handed and left-handed (15/7-) helices in alternate succession. The unit cell is monoclinic (a=9.65 Å, b=5.70 Å, c=28.3 Å, and β=97°; space group Pa). In modification R molecules are highly mobile. There is no ordering with regard to the helix handedness. Molecules resemble cylindrical objects and are packed in a hexagonal dense mode. Regular layer stacking results in crystals with rhombohedral symmetry (a=b=5.70 Å, c=85.00 Å, γ=120°; space group R3̄m).

収録刊行物

• The Journal of Chemical Physics

  The Journal of Chemical Physics 95 (4), 2800-2806, 1991-08-15

  AIP Publishing

キーワード

• Physical and Theoretical Chemistry
• General Physics and Astronomy

詳細情報

• CRID: 1362825895805998208
• NII論文ID: 30015649809
• DOI: 10.1063/1.460931
• ISSN: 10897690
• ISSN: 00219606
• Web Site: https://pubs.aip.org/aip/jcp/article-pdf/95/4/2800/18994321/2800_1_online.pdf
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