Interactions between pi-conjugated chromophores in a giant molecular   spoked wheel
  We discuss the intriguing photophysics of a giant molecular spoked wheel of pi-conjugated arylenealkynylene chromophores on the single-molecule level. This "molecular mesoscopic" tructure, C1878H2682, shows fast switching between the 12 identical chromophores since the fluorescence is unpolarised but only one chromophore emits at a time. 
D. Wuersch, R. May, G. Wiederer, S.-S. Jester, S. Hoeger, J. Vogelsang   and J. M. Lupton
physics.chem-ph