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Self-assembled coordination cages based on banana-shaped ligands
Muxin Han1, David M Engelhard, Guido H Clever
1Institute for Inorganic Chemistry, Georg-August University Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany. gclever@gwdg.de.
Chemical Society Reviews
|February 8, 2014
Summary
Researchers explore the design and synthesis of coordination cages using pyridyl ligands and palladium or platinum. These supramolecular structures exhibit diverse architectures and show potential for selective guest encapsulation, including anionic species.
Area of Science:
- Supramolecular Chemistry
- Coordination Chemistry
- Materials Science
Background:
- Pyridyl ligands and square-planar Pd(II)/Pt(II) cations reliably form supramolecular self-assemblies.
- Discrete coordination cages are valuable for host-guest chemistry applications.
Purpose of the Study:
- To review the design, synthesis, and host-guest chemistry of coordination cages built using pyridyl ligands and Pd(II)/Pt(II) or Pt(II) cations.
- To focus on cages with the general formula [PdnL2n] (n = 2-4).
- To highlight the role of bent, bis-monodentate ligands in cage formation.
Main Methods:
- Supramolecular self-assembly driven by metal-ligand coordination.
- Synthesis of discrete coordination cages with specific ligand designs.
- Host-guest complexation studies to investigate guest binding properties.
Main Results:
- Diverse cage architectures were formed, including globules, knots, and interpenetrated dimers.
- Cages possess large openings facilitating guest entry and exit.
- Cationic nature of most cages favors anionic guest encapsulation.
- Examples of coencapsulation and allosteric binding phenomena were observed.
Conclusions:
- The pyridyl-Pd(II)/Pt(II) strategy is effective for creating diverse coordination cages.
- These cages demonstrate tunable host-guest properties, including selective anion binding.
- Functional ligands can impart photo- and redox-activity to the supramolecular assemblies.
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