{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,30]],"date-time":"2026-05-30T01:07:43Z","timestamp":1780103263895,"version":"3.54.0"},"reference-count":42,"publisher":"Wiley","issue":"11","license":[{"start":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T00:00:00Z","timestamp":1619395200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemPhysChem"],"published-print":{"date-parts":[[2021,6,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Polymorphic salts of <jats:italic>trans<\/jats:italic>\u20101,2\u2010bis(4\u2010pyridyl)ethylene (<jats:italic>bpe<\/jats:italic>), 2<jats:bold>[bpeH<jats:sub>2<\/jats:sub>]<\/jats:bold>\u2009\u22c5\u2009(SO<jats:sub>4<\/jats:sub>)(2HSO<jats:sub>4<\/jats:sub>) (<jats:bold>1<\/jats:bold>) and [bpeH<jats:sub>2<\/jats:sub>]\u2009\u22c5\u20092HSO<jats:sub>4<\/jats:sub> (<jats:bold>2<\/jats:bold>) have been synthesized and their structures determined by X\u2010ray crystallography. The Schmidt postulate predicts that neither of the salts will give rise to photodimerization so they can both potentially be applied as green light emitters. Despite the predictions, <jats:bold>1<\/jats:bold> undergoes a stereospecific solid\u2010state photodimerization reaction with 100\u2009% yield. This is due to UV induced combination of sliding and pedal\u2010like movement of the pyridyl ring system that influences the alignment of C=C bonds. The sliding motion is restricted in <jats:bold>2<\/jats:bold>. Consequently, the green emission from <jats:bold>1<\/jats:bold> is completely quenched after photodimerization. It is evident that counter ions play a dominant role in dis\u2010 and enabling photodimerization; their degree of protonization and lattice placement are important solvent controlled design parameters towards crystal structures that can act as future light emitters.<\/jats:p>","DOI":"10.1002\/cphc.202100143","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T11:39:08Z","timestamp":1619437148000},"page":"1088-1093","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Design of Green\u2010Emitting Salts from Substituted Pyridines: Understanding the Solid\u2010State Photodimerization of <i>trans<\/i>\u20101,2\u2010bis(4\u2010pyridyl)ethylene"],"prefix":"10.1002","volume":"22","author":[{"given":"Abdul Malik Puthan","family":"Peedikakkal","sequence":"first","affiliation":[{"name":"Department of Chemistry King Fahad University of Petroleum &amp; Minerals  Dhahran 31261 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hasan","family":"Al\u2010Mohsin","sequence":"additional","affiliation":[{"name":"Department of Chemistry King Fahad University of Petroleum &amp; Minerals  Dhahran 31261 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Almaz","family":"Jalilov","sequence":"additional","affiliation":[{"name":"Department of Chemistry King Fahad University of Petroleum &amp; Minerals  Dhahran 31261 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theis I.","family":"S\u00f8lling","sequence":"additional","affiliation":[{"name":"Center for Integrative Petroleum Research College of Petroleum &amp; Geosciences King Fahad University of Petroleum &amp; Minerals  Dhahran 31261 Saudi Arabia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anders B.","family":"Skov","sequence":"additional","affiliation":[{"name":"Center for Integrative Petroleum Research College of Petroleum &amp; Geosciences King Fahad University of Petroleum &amp; Minerals  Dhahran 31261 Saudi Arabia"},{"name":"Department of Stability and Analysis Development Hospital Pharmacy of the Capital Region  Marielundvej 25 2730 Herlev Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2021,4,26]]},"reference":[{"key":"e_1_2_6_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature05427"},{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1039\/C7CS00490G"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1088\/1468-6996\/10\/2\/024314"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1557\/mrs.2012.306"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1002\/asia.200900727"},{"key":"e_1_2_6_6_1","author":"Gather M. 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