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. 2021 Jul 9;12:4243. doi: 10.1038/s41467-021-24501-1

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 5 — Left column: o-DPP 6a; right column: m-DPP 6b. a, b UV-vis absorption spectra measured during/after stress-strain experiments and (c, d) the corresponding emission spectra. e, f Stress-strain curves (black) together with the detected emission maxima λ_max,em (blue) and the changes in Full Width at Half Maximum of the emission bands (ΔFWHM, red). Strain values as percentage elongation with respect to initial specimen length.