Effect of shape and nano-segregation in Δ2-isoxazoline and isoxazole on the mesogenic behavior of 1,3-bis-isophthalimines

Bis-1,3-isophthalimines flanked by two side 3-aryl-5-perfluoroalkylisoxazoline or 3-aryl-5-perfluoroalkylisoxazol arms were produced and liquid crystal properties were analysed. Monotropic smectic A mesophase was found for bis-1,3-isophthalimines containing the 3-aryl-5-perfluorooctylisoxazoline (8b...

Full description

Saved in:
Bibliographic Details
Published inLiquid crystals Vol. 49; no. 5; pp. 699 - 708
Main Authors Merlo, Aloir A., Gonçalves, Itamar, Lavayen, Vladimir, Livotto, Paolo R., Weber, Caroline S. B., Halfen, Renato A. P., Walba, David M., da Rosa, Rafaela R.
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 09.04.2022
Taylor & Francis Ltd
Subjects
(2+3)-cycloaddition
Aromatic compounds
bis-1,3-isophthalimines
isoxazoles
Isoxazolines
Liquid crystals
Mesophase
Perfluoro compounds
semifluorinated liquid crystals
Shape effects
Solubility parameters
Thermodynamic properties
Online AccessGet full text

Cover

More Information
Summary:Bis-1,3-isophthalimines flanked by two side 3-aryl-5-perfluoroalkylisoxazoline or 3-aryl-5-perfluoroalkylisoxazol arms were produced and liquid crystal properties were analysed. Monotropic smectic A mesophase was found for bis-1,3-isophthalimines containing the 3-aryl-5-perfluorooctylisoxazoline (8b). Thermal behaviour was analysed and discussed by DSC, POM, DFT calculations, cohesive energy density (CED), Hildebrand solubility parameters and molecular-shape features. Notably, for long side arm perfluorooctyl 8b, the reduced value of CED is partially compensated by molecular shape of the molecules in the condensed state favouring the SmA mesophase formation.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678292.2021.2005164