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In this work, we designed a nonplanar S-shaped compound hel-BA featuring dual [4]helicene. Its synthesis adopts an efficient cationic radical-mediated direct C\u2013H aromatic nucleophilic substitution. X-ray diffraction reveals tight columnar stacking, with its photoluminescence quantum yield in the powder state being 28%. hel-BA displays reversible multiple redox, with the charged states showing near-infrared (NIR) absorption and promising NIR electrochromic materials. These results provide a new perspective on extended helicenes.<\/jats:p>","DOI":"10.1021\/acs.orglett.6c03403","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T05:01:58Z","timestamp":1790139718000},"page":"12299-12304","source":"Crossref","is-referenced-by-count":0,"title":["Nonplanar S-Shaped\nBisanthene: Synthesis, Structures,\nand Properties"],"prefix":"10.1021","volume":"28","author":[{"given":"Yangyang","family":"Zhao","sequence":"first","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]},{"name":"Inner Mongolia University , , ,","place":["Hohhot, China, 010021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laiyun","family":"Zhou","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]},{"name":"Inner Mongolia University , , ,","place":["Hohhot, China, 010021"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xinyu","family":"Zhang","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zenghui","family":"Li","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yihua","family":"Zhang","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710054"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0268-2987","authenticated-orcid":true,"given":"Zehua","family":"Wu","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710054"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3229-5558","authenticated-orcid":true,"given":"Bin","family":"Rao","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1871-117X","authenticated-orcid":true,"given":"Zhicheng","family":"Zhang","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5339-941X","authenticated-orcid":true,"given":"Qing","family":"Wang","sequence":"additional","affiliation":[{"name":"Xi\u2019an Jiaotong University , , , ,","place":["Xi\u2019an, Shaanxi, China, 710049"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,23]]},"reference":[{"key":"2026100208374194800_cit1","doi-asserted-by":"publisher","first-page":"2411","DOI":"10.1039\/D1TC04866J","article-title":"Polycyclic aromatic\nhydrocarbon-based organic semiconductors: ring-closing\nsynthesis and optoelectronic properties","volume":"10","author":"Li","year":"2022","journal-title":"J.\nMater. 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