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In this work they are specified as an advantageous small\u2010molecule platform for multicentered (Se, Te; Cl, Br, I) spin\u2013orbit coupling (SOC) affecting optical properties of \u03c0\u2010organics. Electronic absorption and emission\/photoluminescence spectra of 4,7\u2010di\u2010 and 4,5,6,7\u2010tetrahalogenated 2,1,3\u2010benzochalcogenadiazoles\n                    <jats:bold>E<\/jats:bold>\n                    \/\n                    <jats:bold>X\u2019<\/jats:bold>\n                    and\n                    <jats:bold>E<\/jats:bold>\n                    \/\n                    <jats:bold>X<\/jats:bold>\n                    , respectively (\n                    <jats:bold>E<\/jats:bold>\n                    = chalcogen,\n                    <jats:bold>X<\/jats:bold>\n                    = halogen), have been studied in solid\u2010state and THF solutions experimentally and theoretically. It has been found that the nature of\n                    <jats:bold>E<\/jats:bold>\n                    is the key factor controlling the photophysical properties of\n                    <jats:bold>E<\/jats:bold>\n                    \/\n                    <jats:bold>X\u2019<\/jats:bold>\n                    and\n                    <jats:bold>E<\/jats:bold>\n                    \/\n                    <jats:bold>X<\/jats:bold>\n                    , such as energy levels, Stokes shifts, and the photoluminescence quantum yields, while\n                    <jats:bold>X<\/jats:bold>\n                    serves for further fine tuning of the properties. Combined\n                    <jats:bold>E<\/jats:bold>\n                    and\n                    <jats:bold>X<\/jats:bold>\n                    variation allows target\u2010oriented design of absorptive and emissive materials for metal\u2010free SOC\u2010controlled optoelectronics and emerging spin\u2013orbitronics.\n                  <\/jats:p>","DOI":"10.1002\/cphc.70524","type":"journal-article","created":{"date-parts":[[2026,8,8]],"date-time":"2026-08-08T04:26:58Z","timestamp":1786163218000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Polyhalogenated 2,1,3\u2010Benzochalcogenadiazoles: A Small\u2010Molecule Platform for Multicentered Spin\u2013Orbit Coupling Affecting Optical Properties (Chalcogens = S, Se, Te; Halogens = F, Cl, Br, I)"],"prefix":"10.1002","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8504-3699","authenticated-orcid":false,"given":"Ekaterina A.","family":"Radiush","sequence":"first","affiliation":[{"name":"Institute of Organic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5269-9130","authenticated-orcid":false,"given":"Taisiya S.","family":"Sukhikh","sequence":"additional","affiliation":[{"name":"Institute of Inorganic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yulia S.","family":"Kosenkova","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7219-2409","authenticated-orcid":false,"given":"Ivan S.","family":"Golovanov","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Russian Academy of Sciences  Moscow Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8803-4237","authenticated-orcid":false,"given":"Elena V.","family":"Karpova","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8259-4572","authenticated-orcid":false,"given":"Nikolay A.","family":"Semenov","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5961-423X","authenticated-orcid":false,"given":"Andrey V.","family":"Zibarev","sequence":"additional","affiliation":[{"name":"Institute of Organic Chemistry Siberian Branch of the Russian Academy of Sciences  Novosibirsk Russian Federation"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,8,7]]},"reference":[{"key":"e_1_2_10_2_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.chemrev.6b00127"},{"key":"e_1_2_10_3_1","doi-asserted-by":"publisher","DOI":"10.1070\/PU2005v048n03ABEH001761"},{"key":"e_1_2_10_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.isci.2020.101614"},{"key":"e_1_2_10_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/wcms.83"},{"key":"e_1_2_10_6_1","doi-asserted-by":"publisher","DOI":"10.1039\/D2TC01729F"},{"key":"e_1_2_10_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7TC04181K"},{"key":"e_1_2_10_8_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cej.2021.131169"},{"key":"e_1_2_10_9_1","first-page":"302","article-title":"Calculating the Aromaticity of Heterocycles","volume":"120","author":"Szatylowicz H.","year":"2016","journal-title":"Advances in Heterocyclic Chemistry"},{"key":"e_1_2_10_10_1","first-page":"143","article-title":"2,1,3\u2010Benzochalcogenadiazoles: Regularities and Peculiarities Over a Whole Chalcogen Pentad O, S, Se, Te and Po","volume":"23","author":"Pritchina E. 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