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Issue 18, 2017
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Invisible photochromism and optical anti-counterfeiting based on D–A type inverse diarylethene

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Abstract

In most cases, inverse type diarylethenes (DAEs) exhibit a bathochromic shift of the π-conjugation absorption band after photocyclization, which leads to “visible” closed forms and “visible” photochromic behaviors. The reason for the bathochromic shift is that the lone pair electrons on the sulfur atoms of the thiophene rings function as π-electrons and participate in π-conjugation. To make photochromic behaviors “invisible”, electron-withdrawing aldehyde groups were introduced into the inverse DAE to endow lone pair electrons on the sulfur atoms with more n-electron characteristics and then achieved the hypsochromic shift of the π-conjugation absorption band after photocyclization. As a result, the absorption changes of aldehyde modified inverse DAE (IDAEo-2CHO) remained “invisible” during isomerization, and the only fluorescence changes can be observed by the naked eye after photocyclization. Taking advantage of this unique optical feature of IDAEo-2CHO, anti-counterfeiting applications were implemented.

Graphical abstract: Invisible photochromism and optical anti-counterfeiting based on D–A type inverse diarylethene

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Publication details

The article was received on 05 Mar 2017, accepted on 03 Apr 2017 and first published on 03 Apr 2017


Article type: Paper
DOI: 10.1039/C7TC00962C
Citation: J. Mater. Chem. C, 2017,5, 4571-4577
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    Invisible photochromism and optical anti-counterfeiting based on D–A type inverse diarylethene

    J. Wang, Y. Gao, J. Zhang and H. Tian, J. Mater. Chem. C, 2017, 5, 4571
    DOI: 10.1039/C7TC00962C

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