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This work reports a synergistic strategy combining steric methylation with macrocyclization to transform dynamic into static chirality. The macrocycle\n                    <jats:bold>P5P21<\/jats:bold>\n                    was synthesized by embedding the dynamic unit\n                    <jats:bold>DPP21<\/jats:bold>\n                    into a pillararene. Structural analyses revealed that the pronounced spatial confinement imposed by the pillararene effectively froze the conformational inversion of\n                    <jats:bold>DPP21<\/jats:bold>\n                    , enabling significant chiroptical activity induced by a single methyl group. This strategy dramatically enhanced emission color purity, narrowing the photoluminescence full width at half maximum (FWHM) from 107 to 41\u2009nm, and boosted the quantum yield (PLQY) from 13.1% to 42.7%, yielding efficient narrowband emission in the near\u2010ultraviolet region (371\u2009nm). Mechanistically, macrocyclic locking not only raised the configurational inversion barrier from 17\u2009kcal\/mol to &gt;21\u2009kcal\/mol, ensuring conformational stability, but also significantly reduced the excited\u2010state reorganization energy, which is key to narrowband emission. This study provides a versatile design paradigm for stable, efficient chiral luminescent materials.\n                  <\/jats:p>","DOI":"10.1002\/cplu.70180","type":"journal-article","created":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T11:30:52Z","timestamp":1779363052000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["From Dynamic Chirality to Stable Enantiomers: Conformational Locking via Synergistic Methylation and Macrocyclization"],"prefix":"10.1002","volume":"91","author":[{"given":"Tianyan","family":"Chen","sequence":"first","affiliation":[{"name":"Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Centre Frontiers Science Center for Materiobiology and Dynamic Chemistry East China University of Science &amp; Technology  Shanghai 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