The first examples of room temperature liquid crystal dimers based on cholesterol and pentaalkynylbenzene

Abstract

In this article, we report the synthesis of the first examples of room temperature liquid crystal dimers based on cholesterol and pentaalkynylbenzene linked via flexible alkyl spacers. The thermal behaviour and mesomorphic properties of the newly synthesised compounds were investigated by differential scanning calorimetry, polarised optical microscopy and X-ray diffraction studies. All the synthesised dimers showed nematic (N*) phase at room temperature and exhibited excellent fluorescent emission properties. The steady-state anisotropy and fluorescence lifetime were measured in order to gain further insights into the supramolecular arrangement of these dimers.

Keywords:

• cholesterol
• liquid crystal
• pentaalkynylbenzene
• dimer

Acknowledgement

We are grateful to NMR research facility at IISER Mohali for recording NMR spectrum.

Additional information

Funding

This work was carried out with the financial support from IISER Mohali and Department of Science and Technology, Key Project DST-12-0035 “Liquid crystal Nanocrystal – A new resource of functional soft materials for nanosciences.” M. Gupta acknowledges the receipt of a graduate fellowship from IISER Mohali.