2B01 有機金属錯体液晶のディスコティック液晶(58) : オクタキス(3,4-ジアルコキシフェノキシ)フタロシアニナート(II)錯体の合成とカラムナー液晶性

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A novel phthalocyanine discotic metallomesogenic derivative(2__-) was synthesized. The liquid crystalline properties were characterized by polarizing optical microscopy, absorption spectroscopy, differential scanning calorimetry, and X-ray diffractometry. Noteworthily, the phthalocyanine derivative(2__-) exhibits two kinds of discotic hexagonal columnar phases(D_<ho1>, D_<ho2>) at lower temperatures. On the other hand, it shows discotic tetragonal columnar phase(D_<tet.d>) at higher temperatures, in which the molecules were spontaneously homeotropically arranged. There have been no examples of spontaneous homeotropic arrangement of Pc molecules without any treatment for the glass surface. It is also quite unique that higher symmetry of mesophases(D_h) appear at lower temperatures, which phase transition sequence is opposite to ordinary cases. The X-ray diffraction study revealed that the molecules forms dimers in both D_<ho1> and D_<ho2>, whereas they form monomers in Dtet.d. The study of the difference between the structures of D_<ho1> and D_<ho2> is now in progress. The UV-VIS spectra showed that the two split Q band changes into a single peak at the phase transition temperature from D_<ho2> to D_<tet.d>. According to Kasha's rule, the molecules pile up obliquely in D<ho1> and D<ho2>, and in parallel in D<tet.d>. Thus, we succeed in preparing a novel liquid crystalline phthalocyanine derivative and finding an interesting phase transition behavior.
日本液晶学会の論文
1998-10-12

2B01 有機金属錯体液晶のディスコティック液晶(58) : オクタキス(3,4-ジアルコキシフェノキシ)フタロシアニナート(II)錯体の合成とカラムナー液晶性

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