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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. 3 — a Structures of the ortho-4-methoxybutyl and meta-4-methoxybutyl functionalized DA spring (MeOBuDPP) for theoretical investigations. b Calculated relation between external elongational force (F) and the dihedral angles α, β between Ph and DPP core. c Analysis of the contributions from changes in the dihedral angles and deformation of the structure on the optical properties. d Calculated relation between F and both wavelength and energy of the charge-transfer absorption band of o-/m-MeOBuDPP.