A methyl ketone bridged molecule as a multi-stimuli-responsive color switch for electrochromic devices

A new multi-stimuli-responsive molecular switch M5 with a methyl ketone bridge has been developed to fabricate a visible-near infrared absorbing electrochromic device. The basochromic and electrochromic properties of methyl ketone M5 with nitronaphthalene were studied in detail using a spectroelectrochemical method and density functional theory (DFT) calculations. The colorless M5 can be switched to green-yellow with broad visible-near infrared absorption (400–500 nm, 550–800 nm), stimulated by base and electricity. And a multi electron transfer–proton transfer mechanism (electrobase) of electrochromism for M5 has been proved using cyclic voltammetry (CV) and in situ UV-vis spectroscopy. This multi-stimuli-responsive color switch has been successfully applied in an electrochromic device with attractive properties such as short switching time and good reversibility.

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