• On the polymorphism of the smectic A phases of highly polar compounds

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      https://www.ias.ac.in/article/fulltext/jcsc/092/04-05/0509-0525

    • Keywords

       

      smectic A; polymorphism; reentrant phases; bilayer smectics; induced smectic phases

    • Abstract

       

      The smectic A phase is characterized by a layered arrangement of rod-like molecules, with the average orientation of the molecules normal to the layers and a liquid-like organization within the layers. When the molecules have a strongly polar end group (like-C≡N, -NO2 etc.,), neighbouring molecules prefer an antiparallel orientation. This results in a bilayer structure, with a layer spacing much larger than the molecular length. In many compounds, the structure of the bilayer is sensitive to temperature (or pressure). This results in some interesting phenomena: (a) reentrant phases, as for example, the appearance of a nematic phase below the temperature range of existence of the A phase; (b) a number of polymorphic forms of smectic A; and (c) an ‘induced smectic A’ phase when the compounds with the highly polar terminal groups are mixed with weakly polar compounds even when neither compound by itself exhibits the A phase. This article gives a brief summary of recent results on all these aspects.

    • Author Affiliations

       

      N V Madhusudana1

      1. Raman Research Institute, Bangalore - 560 080
    • Dates

       
  • Journal of Chemical Sciences | News

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