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Mesomorphism of (E)-4-[(4-propyloxyphenyl)diazenyl]phenyl alkanoates (3OABOOCm)
Autorzy
Rok wydania
2024
Czasopismo
Numer woluminu
731
Strony
179649
DOI
10.1016/j.tca.2023.179649
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Several compounds from the group of (E)-4-[(4-propyloxyphenyl)diazenyl]phenyl alkanoates (3OABOOCm, for m = 1 – 19) were synthesized, with the derivatives for m ≥ 8 being reported for the first time. The phase situation was investigated by polarizing optical microscopy, thermo-optical analysis, and differential scanning calorimetry methods. The enantiotropic nematic mesophase was noted for compounds where m = 2 – 13, whereas the monotropic nematic phase was observed for m = 1, 14, and 15. Multiple crystalline phase were noticed in selected derivatives (for m = 1 – 3, 9, 13, and 14). The X-ray powder diffraction confirmed the polymorphism of the crystalline phase for the 3OABOOC2 compound. The trans-cis photoisomerization process is attributed to the presence of the diazenyl (azo) group. Absorption spectra, collected as a function of UV light exposure time, indicated a first-order reaction comprising two components. The determined values of the kinetic constant k were of the order of 10-2 s − 1.
Adres publiczny
http://dx.doi.org/10.1016/j.tca.2023.179649
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