Fluorescence Enhancement of Di-p-tolyl Viologen by Complexation in Cucurbit [7] uril

…, L Gundlach, P Piotrowiak, E Galoppini

Index: Freitag, Marina; Gundlach, Lars; Piotrowiak, Piotr; Galoppini, Elena Journal of the American Chemical Society, 2012 , vol. 134, # 7 p. 3358 - 3366

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Citation Number: 37

Abstract

A viologen derivative, 1, 1′-di-p-tolyl-(4, 4′-bipyridine)-1, 1′-diium dichloride (DTV2+), was studied in solution and encapsulated in cucurbit [7] uril (CB7), a macrocyclic host. Upon encapsulation, DTV2+ exhibited dramatically enhanced fluorescence. Aqueous solutions of DTV2+ were weakly fluorescent (Φ= 0.01, τ< 20 ps), whereas the emission of the DTV2+@ 2CB7 complex was enhanced by 1 order of magnitude (Φ= 0.12, τ= 0.7 ns) and blue- ...