- 2-Methoxypyridine derivatives: Synthesis, liquid crystalline and photo-physical properties
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We herein report the design and synthesis of fourteen new bent shaped luminescent mesogens carrying a pyridine core substituted with various polar groups. They possess a slightly non-planar bent conformation with various intermolecular interactions, as evidenced by their single crystal X-ray diffraction study, and exhibit an ambient to elevated temperature liquid crystalline phase (N or Colr), which has been confirmed by differential scanning calorimetry, polarized optical microscopy, and powder X-ray diffraction techniques. In these compounds, the nature of polar substituents influences significantly the formation of the mesophase over a wide thermal range. The appearance of the nematic phase is due to the presence of the lateral CN group attached to the pyridine core and the terminal F or Cl substituent. The formation of a rectangular columnar phase is attributed to the absence of the lateral CN group in the pyridine core and the presence of the terminal Br, NO2 or 4-pyridyl group.
- Ahipa,Adhikari, Airody Vasudeva
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- Nitrochalcones as organogelators: Evidence of the involvement of nitro groups and solvent in gel formation
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New 4-alkoxynitrochalcones have been synthesized and shown to be organogelators; dodecyloxy/benzyl alcohol gels have been studied by freeze-fracture electron microscopy, DSC and FTIR. We show that the nitro group is involved in the formation of the gel an
- Simon, Franois-Xavier,Nguyen, Thi-Thanh-Tam,Schmutz, Marc,Decher, Gero,Nicoud, Jean-Franois,Mesini, Philippe J.
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experimental part
p. 2028 - 2033
(2009/12/25)
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