File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

신태주

Shin, Tae Joo
Synchrotron Radiation Research Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

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

Author(s)
Park, GeonhuiGoossens, KarelShin, Tae JooBielawski, Christopher W.
Issued Date
2018-04
DOI
10.1002/chem.201705794
URI
https://scholarworks.unist.ac.kr/handle/201301/24150
Fulltext
https://onlinelibrary.wiley.com/doi/abs/10.1002/chem.201705794
Citation
CHEMISTRY-A EUROPEAN JOURNAL, v.24, no.24, pp.6399 - 6411
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.
Publisher
WILEY-V C H VERLAG GMBH
ISSN
0947-6539
Keyword (Author)
dicyanamideionic liquidsliquid crystalsmesophasesself-assembly
Keyword
RAY-POWDER DIFFRACTOMETRYTEMPERATURE IONIC LIQUIDSPENDANT MESOGENIC GROUPSVOLUME-BASED APPROACHALKYL CHAIN-LENGTHX-RAYIMIDAZOLIUM SALTSSELF-ORGANIZATIONAMPHIPHILIC ZWITTERIONSREACTIONS TRIMERIZATION

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.