1-, 2-, and 6-(Ferrocenylethynyl)azulene derivatives 10–16 have been prepared by palladium-catalyzed alkynylation of ethynylferrocene with the corresponding haloazulenes under Sonogashira–Hagihara conditions. Compounds 10–16 reacted with tetracyanoethylene (TCNE) in a [2+2] cycloaddition–cycloreversion reaction to afford the corresponding 2-azulenyl-1,1,4,4,-tetracyano-3-ferrocenyl-1,3-butadiene chromophores 17–23 in excellent yields. The redox behavior of the novel azulene chromophores 17–23 was examined by using cyclic voltammetry (CV) and differential pulse voltammetry (DPV), which revealed their multistep electrochemical reduction properties. Moreover, a significant color change was observed by visible spectroscopy under electrochemical reduction conditions.
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