Polyfluoro-substituted liquid crystals

Sirutkaitis, Romualdas; Adomenas, P. V.

doi:10.1016/b978-0-08-026191-1.50028-1

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…Finally, the effect of the presence of a 2,3,5,6-tetrafluorophenyl is taken into account by comparing 4,4'-di(4-decyloxybenzoyloxy)benzene (N • Iso at 182 °C) with 4,4'-di(4-decyloxybenzoyloxy)-2,3,5,6-tetrafluorobenzene (N • Iso at 139 °C). [76,77] This corresponds to a reduction of ca. 40 °C.…”

Section: Flexibilitymentioning

confidence: 99%

“…Then, to compare the effect of a vinyl versus an ester link, the clearing points of 4,4′‐di(4‐decyloxybenzoyloxy)benzene [69] and 4,4′‐di(4‐decyloxystyryl)benzene [75] are compared, with the latter compound have a clearing point (270 °C) some 90 °C higher than the former (182 °C). Finally, the effect of the presence of a 2,3,5,6‐tetrafluorophenyl is taken into account by comparing 4,4′‐di(4‐decyloxybenzoyloxy)benzene (N ⋅ Iso at 182 °C) with 4,4′‐di(4‐decyloxybenzoyloxy)‐2,3,5,6‐tetrafluorobenzene (N ⋅ Iso at 139 °C) [76,77] . This corresponds to a reduction of ca .…”

Section: Introductionmentioning

confidence: 99%

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Halogen‐Bonded Liquid Crystals

Bruce

Präsang

2023

Helvetica Chimica Acta

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While the halogen bond has been recognised and studied for over a hundred years, it is only in more recent times that chemists have begun to apply it and see its possibilities as another supramolecular interaction that can be deployed in the preparation of materials. This review takes one of those areas, liquid crystals, and considers examples of motifs that have been deployed successfully to generate new mesogens. In particular, rather than attempting to be comprehensive, the article reviews critically data from well‐characterised systems and seeks to first make some comparisons with analogous hydrogen‐bonded materials, before considering how the lability and flexibility of the halogen bond expresses itself in liquid crystal behaviour.

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Section: Flexibilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Halogen‐Bonded Liquid Crystals

Bruce

Präsang

2023

Helvetica Chimica Acta

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Synthesis and Application of an Aromatic Sulfonate Sodium Salt for Aqueous Sodium‐Ion Battery Electrolytes

et al. 2022

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The two‐step synthesis of sodium (2,3,5,6‐tetrafluorophenoxy) diethane sulfonate (Na‐TFP) is reported, starting from 2,3,5,6‐tetrafluorohydroquinone as the precursor. Compared with conventional aqueous electrolytes such as 0.5 m NaClO4 and Na2SO4, the 0.5 m aqueous solution of Na‐TFP provides higher ionic conductivity over a wide range of temperature (e.g., >60 mS cm−1 at 20 °C and >70 mS cm−1 at 30 °C) and a wider electrochemical stability window. Electrochemical cells with Na2VTi(PO4)3 as the positive electrode active material and a carbon‐based negative electrode provide a stable capacity for more than 450 cycles in 0.5 m Na‐TFP. Additionally, symmetric cells with Na2VTi(PO4)3 as the active material for the negative and positive electrode are studied. The cells employing 0.5 m Na‐TFP exhibit a good cycling stability at a high dis‐/charge rate of 5C for more than 50 cycles, which is superior to the performance of the cells employing 0.5 m aqueous solutions of NaClO4 and Na2SO4 as the electrolyte. The design of this bifunctional salt may trigger new ideas for the development of water‐based sodium‐ion battery electrolytes.

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