Structure and liquid crystalline properties of 5-[(4′-heptoxy-4-biphenylyl)carbonyloxy]-1-pentyne
Structure and liquid crystalline properties of 5-[(4′-heptoxy-4-biphenylyl)carbonyloxy]-1-pentyne
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DOI：
10.1080/02678290310001628519
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发表时间：
2004-01
期刊：
影响因子：
2.2
通讯作者：
J. Geng;Shuyun Wang;Wei Ling;Gao Li;E. Zhou;J. Lam;B. Z. Tang
中科院分区：
文献类型：
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作者：
J. Geng;Shuyun Wang;Wei Ling;Gao Li;E. Zhou;J. Lam;B. Z. Tang
采用电子晶体学、X射线衍射、偏光显微镜、差示扫描量热法、透射电子显微镜和原子力显微镜研究了一种含联苯乙炔的化合物[5-[（4′-庚氧基-4-联苯基）羰氧基]-1-戊炔（A3 EO 7）的晶体结构和液晶性质.从甲苯溶液中获得的A3 EO 7晶体采用单斜晶系P112/m空间群，其晶胞参数为a=6.25 °，B=7.82 °，c=46.70 °和γ=96.7°，如使用电子衍射测定的。在从各向同性相冷却时，A3 E07在72.4-53.6°C的温度范围内表现出近晶A相。温度的进一步降低导致近晶C相的形成，其表现出强烈的结晶倾向。
The crystal structure and liquid crystalline properties of a biphenyl-containing acetylene, [5-[(4′-heptoxy-4-biphenylyl)carbonyloxy]-1-pentyne (A3EO7) were investigated by electron crystallography, X-ray diffraction, polarizing optical microscopy, differential scanning calorimetry, transmission electron microscopy, and atomic force microscopy. A3EO7 crystals obtained from a toluene solution adopts a monoclinic P112/m space group with unit cell parameters of a=6.25 Å, b=7.82 Å, c=46.70 Å and γ=96.7°, as determined using electron diffraction. Upon cooling from the isotropic phase, A3EO7 exhibits a smectic A phase in the temperature range 72.4–53.6°C. Further lowering of the temperature results in the formation of a smectic C phase which exhibits a strong tendency towards crystallization.