A novel conjugated [2]rotaxane with an Ru-containing axle constructed from a carboxy-functionalized bis-terpyridyl ruthenium complex and β-cyclodextrin: Synthesis, characterization, and properties

A novel Ru-containing conjugated [2]rotaxane, which utilizes a carboxy-functionalized bis-terpyridyl ruthenium complex as an end group, has been prepared by Suzuki coupling in the presence of β-cyclodextrin (β-CD). The structure has been characterized by NMR spectroscopy and ESI mass spectrometry. Its photophysical properties have shown that insulation by the cyclodextrin reduces the fluorescence intensity compared to that of the free dumbbell.