Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core

Anna Kovářová,
Svatopluk Světlík,
Václav Kozmík,
Jiří Svoboda,
Vladimíra Novotná,
Damian Pociecha,
Ewa Gorecka and
Natalia Podoliak

Full Research Paper
Published 07 Apr 2014

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1. Graphical Abstract
2. Figure 1: Structure of the central cores and lengthening arms.
  
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3. Scheme 1: Synthesis of compounds of series I–III.
  
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4. Scheme 2: Synthesis of compounds of series IV–VI.
  
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5. Figure 2: Chemical formulae of studied compounds I–VI.
  
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6. Figure 3: DSC plots for compounds a) IIb, b) IVb and c) Vb taken on second heating (upper curve) and cooling ...
  
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7. Figure 4: Planar texture of Ib in the SmC_AP_A phase at temperature T = 130 °C (a) without field, and (b) in th...
  
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8. Figure 5: Planar texture of IIb (a) at the phase transition from the SmAP (upper right corner) to the SmC_AP_A ...
  
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9. Figure 6: Switching current for compound IIb at T = 150 °C, taken in the SmC_AP_A phase at a triangular field, E...
  
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10. Figure 7: Planar texture of IIb compound the SmC_SP_A phase at T = 130 °C, (a) without applied field and (b) in...
  
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11. Figure 8: Temperature dependence of the layer spacing value, d, and intensity of the corresponding X-ray sign...
  
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12. Figure 9: X-ray patterns of a partially aligned sample of IIb in (a) the SmC_G phase at 148 °C and (b) in the ...
  
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13. Figure 10: 3-Dimensional plot of the imaginary part of permittivity, ε’’, versus temperature and frequency for ...
  
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14. Figure 11: Temperature dependence of the dielectric strength, Δε, and relaxation frequency, f_r, for IIb.
  
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15. Figure 12: Schematic organization of bent-shaped molecules in layers for the SmC_AP_A–SmC_G–SmC_SP_A sequence of me...
  
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