A new class of bent‐shaped mesogens exhibiting unusual mesophase behaviour |
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Authors: | Ulrike Dunemann Martin W Schröder Gerhard Pelzl Siegmar Diele Wolfgang Weissflog Corresponding author |
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Institution: | Institut für Physikalische Chemie , Martin‐Luther‐Universit?t Halle‐Wittenberg , Mühlpforte 1, 06108 Halle (Saale), Germany |
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Abstract: | Examples of a new class of bent‐core compounds are presented, the central fragment of which consists of a benzoyl derivative of a secondary cyclic amine. The mesophase behaviour has been studied by differential scanning calorimetry, polarizing optical microscopy, X‐ray diffraction and electro‐optical measurements. It was found that the five‐ring compounds form smectic CP or B1 phases which are typical for bent‐core mesogens. The six‐ring compounds exhibit, in some cases, only conventional non‐polar smectic phases; in other cases non‐polar smectic phases as well as banana phases are seen. Of particular interest is the occurrence of a switchable uniaxial semectic A‐like phase with an antiferroelectric structure. |
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