التفاصيل البيبلوغرافية
| العنوان: |
Impact of Polymer Matrix on Polymer Mechanochromism from Excited State Intramolecular Proton Transfer†. |
| المؤلفون: |
Wu, Yu, Cheng, Xin, Hu, Huan, Hu, Shui, Ma, Zhimin, Ma, Zhiyong |
| المصدر: |
Chinese Journal of Chemistry; Mar2024, Vol. 42 Issue 6, p611-616, 6p |
| مصطلحات موضوعية: |
EXCITED states, PROTONS, DIHEDRAL angles, HYDROGEN bonding, SUPRAMOLECULAR chemistry, ACRYLATES |
| مستخلص: |
Comprehensive Summary: Mechanochromic polymers based on non‐covalent changes have attracted much attention recently. Herein, we report the impact of inter/intramolecular hydrogen bonds on polymer mechanochromism from the excited state intramolecular proton transfer (ESIPT) process. PhMz‐NH2‐OH and PhMz=2A are designed and obtained by simple and high‐yield synthesis, and are connected into polyurethane and poly(methyl acrylate‐co‐2‐ethylhexyl acrylate), respectively. In the initial state, the PhMz‐NH2‐OH@PU sample shows blue fluorescence from the excited enol form (E*) excitons, owing to intermolecular hydrogen bonds that interrupt the ESIPT reactions but the PhMz=2A@PMA‐2‐EA sample expresses cyan fluorescence belonging to the excited keto form (K*) emission, implying that the intramolecular hydrogen bonds matter. Furthermore, under stretching, external force can tune the emission of the PhMz=2A@PMA‐2‐EA sample from K* to E* state. Though external force can putatively still promote a bond rotation, ESIPT reactions remain equivalently interrupted in both the relaxed and stressed states in a hydrogen‐bond donating environment. DFT calculation confirms the force‐induced increase in dihedral angle for the transition of ESIPT‐on/off. Thus, PhMz‐NH2‐OH@PU and PhMz=2A@PMA‐2‐EA showed disparate initial ESIPT states and further different responses/sensitivity to force. This study reports a novel and efficient strategy for enriching mechanochromic investigation and extending the applications of ESIPT reactions. [ABSTRACT FROM AUTHOR] |
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