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The bridging element plays a crucial role in determining the electronic characteristics of the resulting \u03c0\u2010conjugated molecules. In this study, we synthesized a series of heteroarene\u2010fused benzo[\n                    <jats:italic>b<\/jats:italic>\n                    ]arsoles and investigated their structures and photophysical properties. All the synthesized arsoles exhibited phosphorescence at 77\u2005K, whereas arsole oxide did not. The phosphorescence intensities of the pnictogen\u2010containing heteroles (phosphorus and arsenic) were significantly higher than those of the tetrel\u2010containing heteroles (silicon and germanium). This trend was analyzed through theoretical calculations, focusing on the energy levels of the excited singlet and triplet states as well as the spin\u2010orbit coupling matrix elements. Furthermore, the indole\u2010fused benzoarsole oxide exhibited a mechanically induced emission color change. The removal of crystalline water triggered a change in the molecular packing that reduced the excimer emission.\n                  <\/jats:p>","DOI":"10.1002\/asia.202401767","type":"journal-article","created":{"date-parts":[[2025,1,22]],"date-time":"2025-01-22T11:29:16Z","timestamp":1737545356000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Heteroarene\u2010Fused Benzo[\n                    <i>b<\/i>\n                    ]arsoles: Structure, Photophysical Properties, and Effects of the Bridging Element"],"prefix":"10.1002","volume":"20","author":[{"given":"Akifumi","family":"Sumida","sequence":"first","affiliation":[{"name":"Faculty of Molecular Chemistry and Engineering Graduate School of Science and Technology Kyoto Institute of Technology, Goshokaido-cho  Matsugasaki Sakyo-ku Kyoto 606-0962 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4516-6296","authenticated-orcid":false,"given":"Kensuke","family":"Naka","sequence":"additional","affiliation":[{"name":"Faculty of Molecular Chemistry and Engineering Graduate School of Science and Technology Kyoto Institute of Technology, Goshokaido-cho  Matsugasaki Sakyo-ku Kyoto 606-0962 Japan"},{"name":"Materials Innovation Lab Kyoto Institute of Technology, Goshokaido-cho  Matsugasaki Sakyo-ku Kyoto 606-8585 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1495-3059","authenticated-orcid":false,"given":"Hiroaki","family":"Imoto","sequence":"additional","affiliation":[{"name":"Faculty of Molecular Chemistry and Engineering Graduate School of Science and Technology Kyoto Institute of Technology, Goshokaido-cho  Matsugasaki Sakyo-ku Kyoto 606-0962 Japan"},{"name":"Materials Innovation Lab Kyoto Institute of Technology, Goshokaido-cho  Matsugasaki Sakyo-ku Kyoto 606-8585 Japan"},{"name":"FOREST Japan Science and Technology Corporation (JST)  Honcho 4-1-8 Kawaguchi Saitama 332-0012 Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,1,30]]},"reference":[{"key":"e_1_2_8_1_1","unstructured":"\u00a0"},{"key":"e_1_2_8_2_2","unstructured":"S. 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