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A Self-Assembled Bicontinuous Cubic Phase with a Single-Diamond Network.

Xiangbing Zeng1, Silvio Poppe2, Anne Lehmann2

  • 1Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK.

Angewandte Chemie (International Ed. in English)
|March 29, 2019
PubMed
Summary

Researchers report the first single-diamond cubic phase in liquid crystals, formed by self-assembling molecules. This discovery introduces a new structural motif and a model for understanding liquid crystal network formation.

Keywords:
X-ray diffractionbolaamphiphilesliquid crystalsself-assemblysingle-diamond networks

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Area of Science:

  • Materials Science
  • Crystallography
  • Supramolecular Chemistry

Background:

  • Liquid crystals exhibit diverse mesophases, including complex cubic structures.
  • Self-assembly of amphiphilic molecules is a key strategy for creating ordered materials.

Purpose of the Study:

  • To report the first observation of a single-diamond cubic liquid crystal phase.
  • To elucidate the molecular organization and network formation within this novel phase.
  • To develop a quantitative model for predicting bicontinuous cubic phases based on molecular architecture.

Main Methods:

  • Synthesis of bolaamphiphiles with swallow-tailed lateral chains.
  • Characterization of the liquid crystal phase using techniques like X-ray diffraction.
  • Development of a space-filling model for cubic phases.

Main Results:

  • The first single-diamond cubic phase (space group ) was successfully synthesized and characterized.
  • The structure consists of p-terphenyl rods forming an infinite network via hydrogen-bonded spheres at tetrahedral junctions.
  • A quantitative model was established relating molecular structure to the formation of six possible bicontinuous cubic phases.

Conclusions:

  • The discovery of the single-diamond cubic phase expands the known structural diversity of liquid crystals.
  • The developed model provides a framework for designing molecules that self-assemble into specific bicontinuous cubic architectures.
  • This work offers insights into the fundamental principles governing self-assembly and network formation in soft materials.