{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T10:01:17Z","timestamp":1790848877194,"version":"4.1.0"},"reference-count":75,"publisher":"Wiley","issue":"37","license":[{"start":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T00:00:00Z","timestamp":1782345600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T00:00:00Z","timestamp":1782345600000},"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"],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    The excited\u2010state properties of helicenes\u2014such as emission quantum yields and singlet lifetimes\u2014generally decline as the number of ortho\u2010fused aromatic rings increases, due to state\u2010mixing and greater skeletal flexibility. Building on our finding that rigid, 3D triptycene units can significantly alter these properties, we designed and synthesized a series of tetra\u2010 and pentahelical coumarins annulated with triptycene in proximate and distal orientations (\n                    <jats:bold>\n                      THC\u2010\n                      <jats:italic>prox<\/jats:italic>\n                    <\/jats:bold>\n                    ,\n                    <jats:bold>\n                      THC\u2010\n                      <jats:italic>dist<\/jats:italic>\n                    <\/jats:bold>\n                    ,\n                    <jats:bold>\n                      PHC\u2010\n                      <jats:italic>prox<\/jats:italic>\n                    <\/jats:bold>\n                    , and\n                    <jats:bold>\n                      PHC\u2010\n                      <jats:italic>dist<\/jats:italic>\n                    <\/jats:bold>\n                    ). These hybrid systems structurally integrate features of both helicenes and helicenoids. Comprehensive photophysical studies reveal that triptycene annulation enhances radiative decay in all systems and improves solid\u2010state emission despite their loose molecular packing. The pentahelicene\u2013helicenoid\n                    <jats:bold>\n                      PHC\u2010\n                      <jats:italic>prox<\/jats:italic>\n                    <\/jats:bold>\n                    displays particularly remarkable behavior. Owing to its high enantiomerization barrier,\n                    <jats:bold>\n                      PHC\u2010\n                      <jats:italic>prox<\/jats:italic>\n                    <\/jats:bold>\n                    can be resolved into configurationally stable isomers. It exhibits high fluorescence quantum yields in solution and solid states, prolonged singlet lifetime, and the largest Stokes shift among the molecules investigated. Its enantiopure forms show a gLum of 5.2 \u00d7 10\n                    <jats:sup>\u22123<\/jats:sup>\n                    (B\n                    <jats:sub>CPL<\/jats:sub>\n                    \u2248 1.0), a value among the highest reported for [5]\u2010 and [6]\u2010helicenes. These results establish helicene\u2013helicenoid hybrids as a promising new class of chiroptical materials with exceptional photophysical and configurational properties.\n                  <\/jats:p>","DOI":"10.1002\/chem.71272","type":"journal-article","created":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T04:32:01Z","timestamp":1782448321000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Helicene\u2010Helicenoid Hybrid Systems by Triptycene Annulation of Helical Coumarins: Improved Chiroptical Properties"],"prefix":"10.1002","volume":"32","author":[{"given":"Debarghya","family":"Sarkar","sequence":"first","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabyasachi","family":"Bag","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ajay Kumar","family":"Sahoo","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Navin","family":"Yadav","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur India"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9477-5015","authenticated-orcid":false,"given":"Jarugu Narasimha","family":"Moorthy","sequence":"additional","affiliation":[{"name":"Department of Chemistry Indian Institute of Technology  Kanpur India"},{"name":"School of Chemistry Indian Institute of Science Education and Research Thiruvananthapuram  Trivandrum 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