Biphenyl-type electron acceptors exhibiting dynamic redox properties: a novel electrochromic system with ‘write protect’ option

Abstract
A novel redox pair undergoing reversible C–C bond making/breaking has been constructed based on a bis(dicyanovinyl)biphenyl derivative and a dianion with the dihydrophenanthrene skeleton; further cyclization of the latter to an enaminonitrile endows the ‘write protect’ option to its electrochromic response.

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