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Four triphenylene (TP) and four hexa-peri-hexabenzocoronene (HBC) derivatives with trialkylsilylethynyl groups were prepared and characterized by differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction measurements. All compounds were highly soluble in less-polar organic solvents and exhibited a columnar phase, Col h or Col r for the TPs, and Col ...
Synthesis and mesophase-transition behaviors of six 1,6-disubstituted pyrene-based hexacatenar liquid crystals 1 n (n=8–18) are reported here. They were synthesized by the Sonogashira coupling between 1,6-diethynylpyrene and 2-bromothiophene bearing a trialkoxybenzoyl group. The phase-transition behavior was studied by differential scanning calorimetry and polarized optical microscopy; a few...
We present a chiral single-arm relief on a micro-meter scale formed in an azo-polymer film by the irradiation of a green optical vortex. A 2-dimensional chiral relief array was also fabricated in the azo-polymer film.
Optical vortices with a helical wavefront due to a phase singularity, and circularly polarized light with a helical electric field have an orbital angular momentum (Lħ) and a spin angular momentum (Sħ), respectively. Consequently, a circularly polarized optical vortex will carry the total angular momentum (Jħ=Lħ+Sħ), defined by the vector sum of the orbital and spin angular momenta. In recent years,...
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