| 초록 |
Charge-transfer (CT) interaction is one of the noncovalent intermolecular interactions, such as ionic interaction, hydrogen bonding interaction, and metal-ion interaction, that can play an important role in the supramolecular self-assembly. Molecules with extended aromatic cores are electron-rich, and therefore suitable for the CT complexation with flat electron-deficient molecules, e.g., 2,4,7-trinitrofluoren-9-one (TNF). In addition, such a planar, sheet-like or discoid molecule confers a favor upon a face-to-face type, intercalated stacking between electron donors and electron acceptors. CT interactions can stabilize, modifiy, or even induce mesophases. Ringsdorf et al. first realized CT induced nematic columnar phases exhibited by mixtures of amorphous side-chain polymers carrying 2,3,6,7,10,11-hexasubstituted triphenylene moieties with TNF and TNF-induced columnar hexagonal phases of related main-chain polymers. In this work, we prepared polymerizable 1,3,5-triazine derivatives which contain phenylacetylenic groups connected to a triazine ring via secondary amino linkages and alkyl tails, and investigated the liquid crystalline (LC) properties of the 1,3,5-triazine derivatives and their CT complexes with TNF by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and X-ray diffraction (XRD) measurement. An equimolar CT complex was polymerized by UV irradiation in the LC state, and then characterized. |
