Formation of hexagonal columnar phases by heterocyclic primidine derivatives

Yang Chu Lin, Chung K. Lai, Yuan Chieh Chang, Kwang Ting Liu

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

The synthesis, characterization, and mesomorphic properties of a new type of heteronuclear compounds derived from pyrimidine as core group are reported. These compounds were prepared by condensation reactions of appropriate acetophenones and benzonitriles in the presence of trifluoromethanesulphonic anhydride. They were characterized by 1H and 13C NMR spectroscopy and elemental analysis, and their phase transitions characterized and studied by thermal analysis and polarizating microscopy. These compounds exhibit hexagonal columnar (Colh) phases, as expected for disk-like molecules; the formation of columnar phases was found to be dependent on the numbers of alkoxy side chains attached. For those compounds having the same numbers of flexible side chains attached, the one with a preferred unsymmetric structure exhibited better mesomorphic properties. The observed improved mesomorphic behaviour of these compounds over other similar all-carbon heterocyclic compounds is attributed to the greater polarization of nitrogen atoms in the core ring.

Original languageEnglish
Pages (from-to)237-242
Number of pages6
JournalLiquid Crystals
Volume29
Issue number2
DOIs
StatePublished - 2002

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