Force-Induced Near-Infrared Chromism of Mechanophore-Linked Polymers
Qingkai Qi, Gaganjot Sekhon, Richard Chandradat
1Fluorescence Research Group, Singapore University of Technology and Design, 8 Somapah Road, 487372 Singapore.
Abstract:
A near-infrared (NIR) mechanophore was developed and incorporated into a poly(methyl acrylate) chain to showcase the first force-induced NIR chromism in polymeric materials. This mechanophore, based on benzo[1,3]oxazine (OX) fused with a heptamethine cyanine moiety, exhibited NIR mechanochromism in solution, thin-film, and bulk states. The mechanochemical activity was validated using UV-vis-NIR absorption/fluorescence spectroscopies, gel permeation chromatography (GPC), NMR, and DFT simulations. Our work demonstrates that NIR mechanochromic polymers have considerable potential in mechanical force sensing, damage detection, bioimaging, and biomechanics.
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