Preparation of poly(thiophene-alt-pyrrole bearing mesogen) was carried out with Migita-Kosugi-Stille coupling type polycondensation with an aid of Pd(0) complex catalyst. The resultant polymer shows lyotropoic liquid crystallinity with good film forming property.The smectic fan-shaped texture is maintained after completion of evaporation of solvent from the polymer solution. The cast film having LC (LC) order shows light emission function upon irradiation of excitation light at 460 nm. The polymer shows LC domain emission. Mechanical orientation allows to yield LC domain aligned film with band structure. Chiral mesogenic side chain induces π-conjugated main chain helicity from distance in molecular level.
The synthesis of polyacetylene-bearing pyrimidine-type three-ringed mesogenic core exhibiting smectic C (SmC) characteristics was conducted. Gas-phase iodine doping of the polymer provided evidence of chemical interaction between the polyene and iodine, which acted as an electron acceptor. The side-chain fluorine atom tilted the mesogen moiety to form SmC as a tilted liquid crystal. The addition of a small amount of chiral inducer yielded SmC* of the polymer as the chiral version of SmC. The liquid crystallinity and electronic properties of the π-conjugated chiral liquid crystal polymer with a helical structure were evaluated.
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