Redox Photochromism of Arylviologen Crystals

Abstract

Reversible color development induced by near UV light (photochromism) was observed for some crystalline powder of 1,1′-diaryl-4,4′-bipyridinium bis(p-toluenesulfonate). Redox mechanism by the electron transfer from the sulfonate anion to viologen dication is claimed.

Piezochromism and hydrochromism through electron transfer: new stories for viologen materials

“…N , N ′-Bis(2,4-dinitrophenyl)-4,4′-bipyridinium dichloride were prepared according to the literature. 34 …”

Variation of the Viologen Electron Relay in Cyclodextrin‐Based Self‐Assembled Systems for Photoinduced Hydrogen Evolution from Water

“…1,1′‐Bis(2,4‐dinitrophenyl)‐4,4′‐bipyridine‐1,1′‐diium Dichloride (3): The synthetic procedure was adapted from a reported publication 40 . 1 H NMR (300 MHz, D 2 O): δ = 9.64–9.42 (m, 6 H), 9.08–8.92 (m, 6 H), 8.37 (d, J = 8.7 Hz, 2 H) ppm.…”

Ring Expansion of a 4,4′‐Bipyridyl Derivative into π‐Conjugated Azepinoazepines

“…After the online publication of this Communication (March 30, 2007), it has been brought to the authors' attention that the 13 C NMR spectra of the assumed azepinoazepine synthesized are essentially identical to those of the viologen structure 1 . 1 H NMR spectra also support this finding, although they were measured in different solvents and at different field strengths 2. The authors therefore retract this Communication and apologize for any inconvenience.…”