Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 16, Issue 11, Pages 3467-3475Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200903049
Keywords
calixarenes; ion pairs; molecular devices; pseudorotaxanes; supramolecular chemistry
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Funding
- EU [NMP4-CT-2003-505487]
- Italian Ministry of University and Research
- University of Bologna
- University of Parma
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The calix[6]arene wheel CX forms pseudorotaxane species with the diazapyrenium-based axle 1 center dot 2PF(6) in CH2Cl2 solution. The macrocyclic component is a heteroditopic receptor, which can complex the electron-acceptor moiety of the axle inside its cavity and the counterions with the ureidic groups on the upper rim. The self-assembled supramolecular species is a complex structure, which involves three components-the wheel, the axle and its counterions-that can mutually interact and affect. The stoichiometry of the resulting supramolecular complex depends on the nature and concentration of the counterions. Namely, it is observed that in dilute solution and with low-coordinating anions the axle takes two wheels, whereas with highly coordinating anions or in concentrated solutions the complex has a 1:1 stoichiometry.
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