A three-dimensional mesophase with rhombohedral structure formed by double-swallow-tailed compounds |
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Authors: | J Kain S Diele G Pelzl Ch Lischka W Weissflog |
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Institution: | 1. Institute of Physics , Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague 8, Czech Republic lejcekl@fzu.cz;3. Institute of Physics , Academy of Sciences of the Czech Republic , Na Slovance 2, 182 21 Prague 8, Czech Republic |
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Abstract: | In five double-swallow-tailed compounds a weakly birefringent high temperature phase occurs which exhibits a characteristic optical texture. On the basis of X-ray diffraction measurements on well oriented monodomains, the structure of this phase could be described by a rhombohedral lattice of space group R3c or R32/c; the lattice parameters are not far from a cubic lattice. In spite of the three dimensional superstructure with long range character, the lateral packing of the molecules is liquid-like - similar to the well known cubic mesophases. |
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