The azide anion as an energy acceptor and an electron donor has been introduced into a metal–viologen compound to form a 2D layered viologen-based trifunctional material, which exhibits the rare discolored function of reversible photochromism and thermochromism. Interestingly, its fluorescence can be switched by visible light irradiation and heating in air.
F. Wan, L. Qiu, L. Zhou, Y. Sun and Y. You, Dalton Trans., 2015, 44, 18320 DOI: 10.1039/C5DT03405A
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