Excited State Charge‐Transfer Complexes Enable Fluorescence Color Changes in a Supramolecular Cyclophane Mechanophore

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Abstract: Mechanochromic mechanophores are reporter molecules that indicate mechanical events through changes of their photophysical properties. Supramolecular mechanophores in which the activation is based on the rearrangement of luminophores and/or quenchers without any covalent bond scission, remain less well investigated. Here, we report a cyclophane‐based supramolecular mechanophore that contains a 1,6‐bis (phenylethynyl) pyrene luminophore and a pyromellitic diimide quencher. In solution, the blue monomer emission of the luminophore is largely quenched and a faint reddish‐orange emission originating from a charge‐transfer (CT) complex is observed. A polyurethane elastomer containing the mechanophore displays orange emission in the absence of force, which is dominated by the CT‐emission. Mechanical deformation causes a decrease of the CT‐emission and an increase of blue monomer emission, due to the spatial separation between the luminophore and quencher. The ratio of the two emission intensities correlates with the applied stress.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Excited State Charge‐Transfer Complexes Enable Fluorescence Color Changes in a Supramolecular Cyclophane Mechanophore ; day:31 ; month:08 ; year:2022 ; extent:1
Angewandte Chemie ; (31.08.2022) (gesamt 1)

Creator: Thazhathethil, Shakkeeb
Muramatsu, Tatsuya
Tamaoki, Nobuyuki
Weder, Christoph
Sagara, Yoshimitsu

DOI: 10.1002/ange.202209225

URN: urn:nbn:de:101:1-2022090115064743021011

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:36 AM CEST

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Thazhathethil, Shakkeeb
Muramatsu, Tatsuya
Tamaoki, Nobuyuki
Weder, Christoph
Sagara, Yoshimitsu

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