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Issue 3, 2013
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Switching with orthogonal stimuli: electrochemical ring-closure and photochemical ring-opening of bis(thiazolyl)maleimides

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Abstract

The photochemistry as well as electrochemistry of novel donor–acceptor bis(morpholinothiazolyl)–maleimides has been investigated. Proper substitution of these diarylethene-type molecular switches leads to the unique situation in which their ring-closure can only be accomplished electrochemically, while ring-opening can only be achieved photochemically. Hence, these switches operate with orthogonal stimuli, i.e. redox potential and light, respectively. The switch system could be optimized by introducing trifluoromethyl groups at the reactive carbon atoms in order to avoid by-product formation during oxidative ring closure. Both photochemical and electrochemical pathways were investigated for methylated, trifluoromethylated, and nonsymmetrical bis(morpholinothiazolyl)maleimides as well as the bis(morpholinothiazolyl)cyclopentene reference compound. With the aid of the nonsymmetrical “mixed” derivative, the mechanism of electrochemically driven ring closure could be elucidated and seems to proceed via a dicationic intermediate generated by two-fold oxidation. All experimental work has been complemented by density functional theory that provides detailed insights into the thermodynamics of the ring-open and closed forms, the nature of their excited states, and the reactivity of their neutral as well as ionized species in different electronic configurations. The particular diarylethene systems described herein could serve in multifunctional (logic) devices operated by different stimuli (inputs) and may pave the way to converting light into electrical energy via photoinduced “pumping” of redox-active meta-stable states.

Graphical abstract: Switching with orthogonal stimuli: electrochemical ring-closure and photochemical ring-opening of bis(thiazolyl)maleimides

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Publication details

The article was received on 05 Oct 2012, accepted on 24 Nov 2012 and first published on 18 Dec 2012


Article type: Edge Article
DOI: 10.1039/C2SC21681G
Citation: Chem. Sci., 2013,4, 1028-1040
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    Switching with orthogonal stimuli: electrochemical ring-closure and photochemical ring-opening of bis(thiazolyl)maleimides

    M. Herder, M. Utecht, N. Manicke, L. Grubert, M. Pätzel, P. Saalfrank and S. Hecht, Chem. Sci., 2013, 4, 1028
    DOI: 10.1039/C2SC21681G

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