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J Am Chem Soc. 2003 Apr 30;125(17):5152-60.

Self-assembly of a tripodal pseudorotaxane on the surface of a titanium dioxide nanoparticle.

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  • 1Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland.

Abstract

This paper describes the self-assembly of a heterosupramolecular system consisting of a tripodal viologen, adsorbed at the surface of a titanium dioxide nanoparticle, that threads a crown ether to form a pseudorotaxane. The viologen, a 1,1'-disubstituted-4,4'-bipyridinium salt with a rigid tripodal anchor group, has been synthesized. This viologen is adsorbed at the surface of a titanium dioxide nanoparticle in solution. As intended, this tripodal viologen is both oriented normal to and displaced from the surface of the nanoparticle and threads a crown ether to form the heterosupramolecular complex. The threading of the crown ether by the tripodal viologen to form the above pseudorotaxane complex at the surface of a titanium dioxide nanoparticle has been studied by (1)H NMR, optical absorption spectroscopy, and cyclic voltammetry.

PMID:
12708867
[PubMed]
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