Unsymmetry effect of hexa-peri-hexabenzocoronenes on columnar mesophase behaviour

ABSTRACT

To address the effects of molecular symmetry on the phase of columnar liquid crystals, a series of unsymmetry (C₁) and symmetry (D_3h) hexa-peri-hexabenzocoronene derivatives was prepared. Compounds 3 and 4, as well as a mixture of compounds 3+4, all had a significantly lower melting temperature and clearing temperature than high-symmetry compounds (D_6h), and all results show a strong dependence on molecular symmetry.

Graphical Abstract

KEYWORDS:

• Low symmetry
• hexa-peri-hexabenzocoronene
• columnar phase
• discotic liquid crystals

Acknowledgement

We acknowledge the support and encouragement of Prof. H.-F. Hsu at Tamkang University and Prof. M.-H. Chiang, Dr Y.-C, and Dr M.-C., Tseng at Institute of Chemistry, Academia.

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Additional information

Funding

This work was supported by the Ministry of Science and Technology of the People’s Republic of China [MOST 103-2113-M-017-004 –MY2]