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Structure and Packing in Smectic E and Smectic A Phases in the Series of 4‐n‐Alkyloxy‐4′‐alkanoylbiphenyls
Author(s) -
Diele S.,
Tosch S.,
Mahnke S.,
Demus D.
Publication year - 1991
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170260625
Subject(s) - orthorhombic crystal system , antiparallel (mathematics) , crystallography , molecule , alkyl , lattice (music) , liquid crystal , phase (matter) , materials science , chemistry , condensed matter physics , crystal structure , physics , organic chemistry , quantum mechanics , magnetic field , acoustics
By means of X‐ray investigations the structure of the S E and S A ‐phases of the title compounds has been studied. The lattice parameters of the orthorhombic S E structure are given. The thickness of the smectic layers is nearly the same in the S E and S A phases and agrees well with the length of the molecules in their most stretched form. That suggests a similar conformation of the alkyl chains in both phases. A model of the packing in the S A phase is discussed which is based on a dense packing with antiparallel orientation of molecules with a non‐symmetrical shape.