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Chemistry Letters, Vol.38, No.2, 190-191, 2009
Synthesis of a Linked [1]-[1]Rotaxane
Highly organic soluble [1]-[1]rotaxane also known as linked [3]rotaxane was synthesized by intramolecular self-inclusion of a modified permethylated alpha-cyclodextrin (PM alpha-CD) to form a pseudo[1]rotaxane followed by dimerization. The NMR spectroscopy of thus formed rotaxane suggests that the diphenylacetylene units are fully encapsulated by the PM alpha-CDs. The Stern-Volmer analysis of fluorescence quenching using a viologen analogue shows that the PM alpha-CDs inhibits electron transfer efficiently suggesting a high coverage ratio of the pi-conjugated axle with the PM alpha-CDs.