Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 244, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2021.109739
Keywords
Azobenzene; Liquid crystal; Halogen bond
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Funding
- Consejo Nacional de Ciencia y Tecnologia CONACYT Mexico [242232]
- CONACyT Mexico
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This study focuses on the synthesis and thermotropic behavior of a hexyloxy-substituted pyridyl-ethynylene-azobenzene and its halogen-bonded complex with tetrafluoroiodophenyl decanoate. The reported complex is a highly anisotropic photoactive mesogen that displays only smectic-type order and appears to be stable in solution.
This work deals with the synthesis and thermotropic behavior of a hexyloxy-substituted pyridyl-ethynylene-azobenzene and its halogen-bonded complex (XB complex) with tetrafluoroiodophenyl decanoate. The XB complex here reported is a highly anisotropic photoactive mesogen. It displays only smectic-type order where two different lamellar stacks seem to co-exist. The smectic period (determined by XRD) shorter than the theoretical length of the XB-complex suggests a single layer stacking of molecules, which may be arranged head-totail to satisfy the electrostatic interactions between fluorinated and non-fluorinated rings. Finally, photo-isomerization and NMR experiments seem indicate that the halogen-bonded complex is stable in solution.
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