To request permission to reproduce material from this article in a commercial publication, Provided that the correct acknowledgement is given and it is not used for commercial purposes. This article in other publications, without requesting further permission from the RSC, Wang,Ĭreative Commons Attribution-NonCommercial 3.0 Unported Licence. Precise peripheral design enables propeller-like squaraine dye with highly sensitive and wide-range piezochromism The piezochromic behavior of SQ-NMe 2 microcrystals is sensitive, high-contrast, and easily reversible, enabling cryptographic applications. Single-crystal X-ray diffraction structural analysis of two SQ-NMe 2 polymorphs provides direct evidence to illustrate the design concept of such a piezochromic molecule. As such, the pristine SQ-NMe 2 microcrystal exhibits significant fluorescence changes from yellow ( λ em = 554 nm) to orange ( λ em = 590 nm) upon slight mechanical grinding and further to deep red ( λ em = 648 nm) upon heavy mechanical grinding. This precise peripheral design is expected to loosen the molecular packing pattern and facilitate more substantial intramolecular charge transfer (ICT) switching caused by conformational planarization under mechanical stimuli. Here we present a propeller-like squaraine dye SQ-NMe 2 decorated with four peripheral dimethylamines acting as electron donors and spatial obstacles.

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