{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T05:20:18Z","timestamp":1787721618733,"version":"build-2784847793"},"reference-count":63,"publisher":"Wiley","license":[{"start":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T00:00:00Z","timestamp":1787616000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,8,25]],"date-time":"2026-08-25T00:00:00Z","timestamp":1787616000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Chemistry A European J"],"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>Achieving high quantum yields in neat films of extended heteroacenes remains challenging because their large aromatic surfaces promote aggregation\u2010caused quenching (ACQ) and non\u2010radiative decay, while often limiting solubility and solution processability. Here we introduce proximal steric shielding to control solid\u2010state emission in quinoxaline\u2010fused pyrene heteroacenes. By systematically varying tri\u2010\/tetraphenylethene and alkynylsilane substituents around the heteroacene core, we establish a clear structure\u2013property relationship showing that solid\u2010state emission depends not simply on the amount of steric bulk, but on the spatial positioning of these substituents relative to the emissive \u03c0\u2010system. A modular synthetic route gives four soluble azaacenes with low solution PLQYs (6%\u201314%) but strongly enhanced emission in neat films. The optimised triPE\u2010TIPS derivative exhibits a PLQY of 82%, among the highest values reported for linearly fused azaacenes. Single\u2010crystal x\u2010ray analysis, Hirshfeld surface analysis, fluorescence lifetime measurements, aggregation studies, and DFT calculations collectively support a mechanism in which the matched proximal arrangement of triPE and TIPS groups suppresses close \u03c0\u2013\u03c0 contacts and reduces non\u2010radiative decay. Importantly, the enhanced neat\u2010film emission is distinct from conventional aggregation\u2010induced emission (AIE) behavior, instead arising from substituent\u2010position\u2010controlled molecular packing. These findings establish proximal steric shielding as a practical design strategy for suppressing solid\u2010state quenching in extended \u03c0\u2010systems.<\/jats:p>","DOI":"10.1002\/chem.71622","type":"journal-article","created":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T04:47:22Z","timestamp":1787719642000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Proximal Steric Shielding Unlocks High Solid\u2010State Luminescence in Quinoxaline\u2010Fused Pyrene Heteroacenes"],"prefix":"10.1002","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-0342-3748","authenticated-orcid":false,"given":"Rafiq","family":"Ahamed","sequence":"first","affiliation":[{"name":"The Liebig Lab, Organic Chemistry Division CSIR\u2010National Chemical Laboratory (NCL)  Pune Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sonal","family":"Patil","sequence":"additional","affiliation":[{"name":"The Liebig Lab, Organic Chemistry Division CSIR\u2010National Chemical Laboratory (NCL)  Pune Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-6596-7553","authenticated-orcid":false,"given":"Madhusudan","family":"Dutta","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Science Education and Research (IISER) Pune  Pune India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Godi Kiran Venkata","family":"Sai","sequence":"additional","affiliation":[{"name":"The Liebig Lab, Organic Chemistry Division CSIR\u2010National Chemical Laboratory (NCL)  Pune Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-7517-7760","authenticated-orcid":false,"given":"Sergey","family":"Fisher","sequence":"additional","affiliation":[{"name":"Van't Hoff Institute For Molecular Sciences University of Amsterdam  Amsterdam Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anil","family":"Bhadke","sequence":"additional","affiliation":[{"name":"Department of Fibres and Textile Processing Institute of Chemical Technology (ICT)  Mumbai Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rama Krishna","family":"Gamidi","sequence":"additional","affiliation":[{"name":"The Liebig Lab, Organic Chemistry Division CSIR\u2010National Chemical Laboratory (NCL)  Pune Maharashtra India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5623-439X","authenticated-orcid":false,"given":"Susnata","family":"Pramanik","sequence":"additional","affiliation":[{"name":"Department of Chemistry, Faculty of Science and Engineering SRM Institute of Science and Technology Kattankulathur Chennai India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0013-4116","authenticated-orcid":false,"given":"Tom\u00e1\u0161","family":"\u0160olomek","sequence":"additional","affiliation":[{"name":"Van't Hoff Institute For Molecular Sciences University of Amsterdam  Amsterdam Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0093-6963","authenticated-orcid":false,"given":"Sudhakar","family":"Gaikwad","sequence":"additional","affiliation":[{"name":"The Liebig Lab, Organic Chemistry Division CSIR\u2010National Chemical Laboratory (NCL)  Pune Maharashtra India"},{"name":"Yusuf Hamied Department of Chemistry University of Cambridge  Cambridge UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,25]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"crossref","unstructured":"M. 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