Novel mesogenic benzoic acids with large branches I. Synthesis, liquid crystalline properties and crystal structure analyses of 3-(4-Subst.-benzyloxycarbonyl)-4-(4-n-octyloxybenzoyloxy)benzoic acids

Article abstract of DOI:10.1080/10587259608034063

New benzoyloxybenzoic acids bearing both terminal and lateral groups have been synthesized. Substituted aryl rings are laterally attached to the basic mesogens by means of an odd-numbered spacer. Therefore, liquid crystalline behaviour can be observed at high temperatures. The crystal and molecular structure of 3-(4-cyano-benzyloxycarbonyl)-4-(4-n-octyloxybenzoyloxy)benzoic acid 3b has been determined by X-ray analysis. 3b crystallizes in space group P2₁/n with four molecules in a unit cell of the following dimensions: a = 15.682(2), b = 7.701(1), c = 23.107(3) A, β = 97.69(1)°. The structure was solved by direct methods and refined to an R value of 0.057 for 3684 observed reflections. The molecules of 3b are associated to dimers with a shape unusual for mesogens exhibiting nematic and smectic phases. In the crystal the dimers are closely packed to ribbons which on their part are connected to lamellar sheets. The nitro-substituted homologue 3c was proved to be isostructural with 3b.

Full text of DOI:10.1080/10587259608034063

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Molecular Crystals and Liquid Crystals
Science and Technology. Section A.
Molecular Crystals and Liquid Crystals
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Novel Mesogenic Benzoic Acids
with Large Branches I. Synthesis,
Liquid Crystalline Properties and
Crystal Structure Analyses of 3-(4-
Subst.-benzyloxycarbonyl)-4-(4-n-
octyloxybenzoyloxy) benzoic Acids
W. Weissflog a , E. Dietzmann a , C. Stützer a , M. Drewello b , F.
Hoffmann b & H. Hartung b
a Max-Planck-Gesellschaft, Arbeitsgruppe Flüssigkristalline Systeme ,
Mühlpforte 1, D-06108, Halle, Germany
b Martin-Luther-Universität Halle- Wittenberg, Institut für
Physikalische Chemie , Mühlpforte 1, D-06108, Halle, Germany
Published online: 24 Sep 2006.
To cite this article: W. Weissflog , E. Dietzmann , C. Stützer , M. Drewello , F. Hoffmann & H. Hartung
(1996) Novel Mesogenic Benzoic Acids with Large Branches I. Synthesis, Liquid Crystalline Properties
and Crystal Structure Analyses of 3-(4-Subst.-benzyloxycarbonyl)-4-(4-n-octyloxybenzoyloxy) benzoic
Acids, Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals
and Liquid Crystals, 275:1, 75-90, DOI: 10.1080/10587259608034063
To link to this article: http://dx.doi.org/10.1080/10587259608034063
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