“Synthesis, design and characterization of supramolecular self-assembly of calix[4]resorcinare substituted LCs”

Abstract

A new class of supramolecular calix[4]resorcinarene substituted alkoxy side chain (-OC₅H₁₁, -OC₈H₁₇, -OC₁₀H₂₁) has been synthesized and well characterized. These supramolecular compounds were investigated by polarizing optical microscope (POM), differential scanning calorimetry (DSC), thermogravimmetric analysis (TGA) and high-temperature X-ray diffraction studies (XRD). The present synthesized supramolecular derivatives are promising to stabilize the hexagonal columnar phase over a broad thermal range. All the synthesized derivatives showed hexagonal columnar phase at lower temperature and showed enantiotropical nature. Compound 2a with small alkyl spacer on eight side showed higher thermal stability as compare to higher alkyl spacer substituted compounds 2b and compound 2c. These research results suggest that calix[4]resorcinarene was a good platform to construct bowl-shaped derivatives to exhibits the columnar liquid crystal phase and the observed liquid crystalline properties were greatly effected by the substituted alkoxy side chain on eight side of calix[4]resorcinarene skeletone. All the synthesized compounds were characterized by FT-IR, ¹H NMR and ¹³C NMR spectroscopy.

Graphical Abstract

Key Words:

• Calix[4]resorcinarene
• enantiotropic
• columnar phase
• supramolecular LCs

Acknowledgment

Authors acknowledge thanks to Department of Chemistry, School of Science, Gujarat University for providing lab facility. Authors are also thankful to NFDD Centre for providing analytical and spectral services. Authors thanks to Dr. Anuj Sharma (Department of Chemistry, Gujarat University) for helping fruitful discussion in high temperature XRD analysis.