Dicyanamide Salts that Adopt Smectic, Columnar, or Bicontinuous Cubic Liquid-Crystalline Mesophases

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Title
Dicyanamide Salts that Adopt Smectic, Columnar, or Bicontinuous Cubic Liquid-Crystalline Mesophases
Author(s)
Geonhui Park; Karel Goossens; Tae Joo Shin; Christopher W. Bielawski
Publication Date
2018-04
Journal
CHEMISTRY-A EUROPEAN JOURNAL, v.24, no.24, pp.6399 - 6411
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Although dicyanamide (i.e., [N(CN)(2)](-)) has been commonly used to obtain low-viscosity, halogen-free, room-temperature ionic liquids, liquid-crystalline salts containing such anions have remained virtually unexplored. Here we report a series of amphiphilic dicyanamide salts that, depending on their structures and compositions, adopt smectic, columnar, or bicontinuous cubic thermotropic liquid-crystalline mesophases, even at room temperature in some cases. Their thermal properties were explored by polarized light optical microscopy, differential scanning calorimetry, thermogravimetric analysis (including evolved gas analysis), and variable-temperature synchrotron X-ray diffraction. Comparison of the thermal phase characteristics of these new liquid-crystalline salts featuring "V-shaped" [N(CN)(2)](-) anions with those of structural analogues containing [SCN](-), [BF4](-), [PF6](-), or [CF3SO3](-) anions indicated that not only the size of the counterion but also its shape should be considered in the development of mesomorphic salts. Collectively, these discoveries may be expected to facilitate the design of thermotropic ionic liquid crystals that form inverted-type bicontinuous cubic and other sophisticated liquid-crystalline phases (c) 2018 Wiley-VCH Verlag GmbH & Co.
URI
https://pr.ibs.re.kr/handle/8788114/4558
ISSN
0947-6539
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
Files in This Item:
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