Incompatibility-Driven Self-Organization in Polycatenar Liquid Crystals Bearing Both Hydrocarbon and Fluorocarbon Chains,The Journal of Physical Chemistry B

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Incompatibility-Driven Self-Organization in Polycatenar Liquid Crystals Bearing Both Hydrocarbon and Fluorocarbon Chains
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2017-09-08 00:00:00 , DOI: 10.1021/acs.jpcb.7b04490
Adrian Gainar ₁ , Mei-Chun Tzeng ₁ , Benoît Heinrich ₂ , Bertrand Donnio ₂ , Duncan W. Bruce ₁

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The synthesis and liquid crystal properties are reported for tri- and tetra-catenar mesogens in which both hydrocarbon and semiperfluorocarbon chains have been incorporated. In the tricatenar mesogens, the lamellar spacing in the smectic C phase of the all-hydrocarbon mesogen almost doubles when the isolated hydrocarbon chain is replaced by a semiperfluorinated chain on account of the localized segregation in different sublayers between the two chain types. In the tetracatenar materials, the replacement of at least one hydrocarbon chain by semiperfluorocarbon chains is sufficient to promote columnar phase formation, but when the molecule has two hydrocarbon chains at one end and two semiperfluorocarbon chains at the other, the requirement for localized phase segregation leads to the formation of a rectangular phase with very large lattice parameters. The juxtaposition of terminal chains of different nature within the same molecular structure thus leads to a reduction in mesophase symmetry and the emergence of more complex supramolecular organization.

中文翻译：

具有碳氢链和碳氟链的聚类液晶中不兼容驱动的自组织

报道了其中已结合有烃链和半全氟化碳链的三和四芳族液晶元的合成和液晶性质。在三芳基系液晶元中，由于分离的烃链被半全氟化链取代，由于两种链型之间不同亚层的局部偏析，全烃系液晶元的近晶C相中的层状间距几乎翻倍。在四分类材料中，用半全氟化碳链取代至少一个烃链足以促进柱状相的形成，但是当分子的一端有两个烃链而另一端有两个半全氟链时，对局部相分离的要求导致形成具有非常大的晶格参数的矩形相。因此，同一分子结构内不同性质的末端链并列会导致中间相对称性降低，并出现更复杂的超分子组织。

更新日期：2017-09-08

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