652156-96-2Relevant academic research and scientific papers
Hindered fluorescence quenching in an insulated molecular wire
Taylor, Peter N.,Hagan, Andrew J.,Anderson, Harry L.
, p. 3851 - 3856 (2007/10/03)
A [3]rotaxane 2?12 consisting of an anionic phenylene ethynylene dumbbell 24- threaded through two cationic cyclophanes 12+ has been prepared using aqueous Glaser coupling. Stern-Volmer analysis of the fluorescence quenching using three different electron-acceptors (methyl viologen 132+, dipropyl-4,4′-bipyridinium disulfonate 14 and anthraquinone-2,6-disulfonate 152-) shows that the threaded cyclophanes inhibit electron-transfer from the excited state of the dumbbell by steric shielding, and by electrostatic shielding in the case of methyl viologen.
