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4-octylphenylazo-4'-phenyl alkanoates : homologous series of azomesogens with extremely rich liquid-crystalline polymorphism.
Autorzy
Rok wydania
2017
Czasopismo
Numer woluminu
44
Strony
1600-1606
DOI
10.1080/02678292.2017.1306885
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
This paper presents synthesis and liquid-crystalline properties of full homologues series (from acetate to arachidate) of 4-octylphenylazo-4′-phenyl alkanoates. All of the 19 synthesised compounds are liquid crystals with extremely rich mesomorphism. The ester chain length strongly influences mesogenic behaviour of presented materials. In some compounds, up to four liquid-crystalline phases have been observed. There were six different mesophases detected: nematic, smectic C, smectic F, smectic I, J and G. Moreover, some homologues display two crystalline forms. This latter phenomenon does not depend on the ester chain length. Identification of such complicated phase sequences was made based on four methods: polarised light microscopy, thermo-optical analysis, differential scanning calorimetry and X-ray measurements.
Słowa kluczowe
liquid crystals, azobenzene, smectic, dSC, xRD
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