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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Designed supramolecular assembly of hydrogen-bonded anionic rosette layers
Jie Han1, Chung-Wah Yau, Chi-Keung Lam
1Department of Chemistry and Center of Novel Functional Molecules, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR, PR China.
Journal of the American Chemical Society
|July 10, 2008
Summary
Researchers explored self-assembly of hydrogen-bonded honeycomb grids using guanidinium cations and various anions. New rosette layers were constructed, including distorted structures from unconventional building blocks, expanding supramolecular chemistry design.
Area of Science:
- Supramolecular Chemistry
- Crystal Engineering
- Materials Science
Background:
- Hydrogen-bonded honeycomb grids with rosette motifs are formed by self-assembly.
- Guanidinium cations and various anions serve as primary building blocks.
- Interlayer templates like tetraalkylammonium ions are often used.
Purpose of the Study:
- To explore the self-assembly of novel two-dimensional hydrogen-bonded honeycomb grids.
- To investigate the formation of rosette motifs using guanidinium and diverse anionic components.
- To design and construct new supramolecular architectures by modifying templates and building blocks.
Main Methods:
- Utilizing guanidinium cation and various anionic components as building blocks.
- Employing tetraalkylammonium ions as interlayer templates.
- Introducing auxiliary templates like 1H-imidazole-4,5-dicarboxylate and boric acid to control layer configurations.
Main Results:
- Five distinct two-dimensional hydrogen-bonded honeycomb grids bearing the rosette motif were successfully self-assembled.
- A sinusoidal guanidinium-carbonate rosette layer was induced to adopt a nearly planar configuration.
- A novel three-component guanidinium-boric acid-carbonate wavy layer with two rosette motifs was constructed.
- New, albeit distorted, rosette layers were generated using unconventional anionic building blocks (1,2-dithiosquarate and 1,1'-biphenyl-2,2',6,6'-tetracarboxylate) that lack C3-symmetry.
Conclusions:
- The study demonstrates the versatility of guanidinium-based systems in forming diverse supramolecular architectures.
- Modification of templates and use of unconventional building blocks enable the generation of novel and distorted rosette layers.
- This work expands the scope of topological design in supramolecular chemistry, paving the way for new materials with tailored properties.
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