Hydrogen-bond mediated columnar liquid crystalline assemblies of C3 -symmetric heptazine derivatives at ambient temperature

Soft Matter
Indu BalaSantanu Kumar Pal

Abstract

A new class of hydrogen (H) bonded fluorescent liquid crystals (FLCs) based on a newly discovered s-heptazine fluorophore discotic component have been synthesized. The tendency of the s-heptazine core to form H-bonded LCs has been explored for the first time. Interestingly, the pure heptazine derivatives (non-mesomorphic) on complexation with tri-alkoxy benzoic acids exhibit enantiotropic columnar mesomorphism over a wide range of temperatures including room temperature. This indicates the strength of the resulting H-bonded complexes. The H-bonded supramolecular complexes were studied through FT-IR, temperature dependent FT-IR and NMR studies and H-D exchange studies, and their thermal behaviour was deduced through polarized optical microscopy (POM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) studies. Because of the inherently fluorescent pure heptazine derivative, the resulting complexes exhibit fluorescent behaviour in the solution state as well as in the solid state.

References

Dec 15, 2005·Angewandte Chemie·Takashi KatoKenji Kishimoto
Dec 21, 2005·Chemical Society Reviews·Sandeep Kumar
Mar 17, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Sang Hyuk SeoJi Young Chang
Oct 21, 2015·Chemical Reviews·Tobias WöhrleSabine Laschat
Sep 1, 2016·Journal of the American Chemical Society·Beatriz FeringánTeresa Sierra
Sep 8, 2017·Chemistry : a European Journal·Indu BalaSantanu Kumar Pal
Oct 6, 2017·Chemical Communications : Chem Comm·Irla Siva Kumar, Sandeep Kumar
Nov 10, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Joydip DeSantanu Kumar Pal

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Methods Mentioned

BETA
NMR
X-ray
fluorescence studies
column chromatography

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