Relationships between mesophase behavior and crystal structures of chiral smectogenic 4-[(S)-2-methylbutyl]phenyl 4'-alkoxybiphenyl-4-carboxylates.
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概要
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Interlayer distances of Sm<SUP>*</SUP>C and Sm A phases of the title series were measured as functions of temperature by X-ray diffraction. With increase in temperature, molecular tilt angles in Sm<SUP>*</SUP>C decrease from 22–25 to 0°. Crystal structures of the heptyl (<B>1</B>) and octyl (<B>2</B>) homologues have been determined by X-ray analysis. (<B>1</B>): 4-[(<I>S</I>)-2-Methylbutyl]phenyl 4′-heptyloxybiphenyl-4-carboxylate, monoclinic, <I>P</I>2<SUB>1</SUB>, <I>a</I>=26.929(4), <I>b</I>=5.4249(5), <I>c</I>=9.2607(9) Å, β=96.78(1)°, <I>Z</I>=2. (<B>2</B>): 4-[(<I>S</I>)-2-Methylbutyl]phenyl 4′-octyloxybiphenyl-4-carboxylate, orthorhombic, <I>P</I>2<SUB>1</SUB>2<SUB>1</SUB>2<SUB>1</SUB>, <I>a</I>=9.249(1), <I>b</I>=56.259(9), <I>c</I>=5.412(1) Å, <I>Z</I>=4. Final <I>R</I> were 0.076 and 0.121, respectively. Both crystals have distinct layer structures similar to those of Sm<SUP>*</SUP>C. In the former crystal, the molecules tilt to one direction uniformly throughout layers, while in the latter, they take two opposite directions alternately from layer to layer. However, structures within a layer are very similar to each other. Each molecule has a coplanar biphenyl moiety and a twisted paraffin chain. Mesophase behavior was interpreted very well by the molecular interaction revealed in the crystal structures.
- 公益社団法人 日本化学会の論文
著者
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OHASHI Yuji
Department of Chemistry and Materials Science Tokyo Institute of Technology
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Hori Kayako
Department Of Chemistry College Of Humanities And Sciences Nihon University
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OHASHI Yuji
Department of Chemistry, Ochanomizu University
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Takamatsu Miho
Department of Chemistry, Ochanomizu University
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