Preparation, spectral and thermal properties of new Isoflavone derivatives: mesomorphic properties and DFT studies

ABSTRACT

The four new homologous series of symmetric Isoflavon dimers were synthesised using varied alkyl/aryl diamines in linear sense. The chemical structures of the molecules were characterised by IR, NMR and CHNS analysis. Further, Liquid crystalline properties were verified using the combination of differential scanning calorimetry (DSC) and polarised optical microscope (POM). The molecular systems studied here reveal that LC property depends on the length of the middle connecting diamine spacer along with terminal alkyl spacer. The lower members favour to exhibit smectic A phase, whereas higher members exhibit nematic mesophase. The nature of LC property behaviours is supported by molecular geometries studied by DFT calculations.

Graphical Abstract

KEYWORDS:

• Isoflavon heterocycle
• coumarin
• liquid crystal
• mesophase
• dimers

Acknowledgments

The authors would like to thank Universiti Sains, Malaysia for providing the POM, DSC and for some sample NMR studies.

Disclosure statement

No potential conflict of interest was reported by the authors.

Supplementary material

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