Abstract
Viologens are known as an excellent electron acceptor and a versatile supramolecular building block, the physical property of which can be tuned by varying the N-substitution. Herein, we present a class of unprecedented quinoid-viologen conjugates wherein a quinoidal unit is incorporated as part of an extended π-system of the viologen units through N-substitution. Such class of molecules show intriguing optical and electronic properties inherited from both the viologen and the quinoid constituents, displaying stronger electron accepting characters, visible absorption, reversible redox activity, modulated electrochromism, and characteristic binding towards Cucurbit [n]urils (n = 7 and 8). This molecular design strategy points to a new direction to diversify viologens for functional electroactive materials and complex architectures.
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