Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 106, Issue 26, Pages 10425-10429Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0809512106
Keywords
interlocked molecules; pseudorotaxanes; supramolecular chemistry; tandem mass spectrometry; crown ether
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Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 765]
- Fonds der Chemischen Industrie (FCI)
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Starting from the basis of a simple 4-component self-sorting system of crown ethers and ammonium ions, we design 6 building blocks in which 2 identical or different binding sites are incorporated. These building blocks can be mixed in many different ways to yield quite distinctly different pseudorotaxane assemblies. The self-sorting process integrates all building blocks in specific places so that this approach permits us to exert positional control and can widely influence the resulting assemblies with respect to the details of their structures. At maximum, we report quadruply interlocked species with up to 5 subunits that form specific assemblies. Although NMR methods are limited to the analysis of simpler complexes, ESI-MS and, in particular, tandem mass spectrometry is highly useful to analyze the assemblies' connectivities.
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