{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T22:08:12Z","timestamp":1776463692371,"version":"3.51.2"},"reference-count":69,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2016,8,12]],"date-time":"2016-08-12T00:00:00Z","timestamp":1470960000000},"content-version":"vor","delay-in-days":11,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemistrySelect"],"published-print":{"date-parts":[[2016,8]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Imidazopyrazinone dioxetanone is a central molecule in bioluminescence, as it is the scaffold responsible for light emission in many marine species. Herein, we have theoretically studied the thermolysis of its neutral and anionic forms. Our results allowed us to explain imidazopyrazinone bioluminescence with the Interstate Crossing\u2010Induced Chemiexcitation (ICIC) mechanism, and explain why neutral forms emit light efficiently to the contrary of anionic ones. Both forms decompose via a stepwise\u2010biradical pathway, but the biradical is formed either via an electron transfer (anion) or due to homolytic bond cleavage (neutral species). Absence of electron transfer leads to an entropic trap, a flat region where infinite possibilities for chemiexcitation exist. However, the resulting products can be in either triplet or singlet excited states. The triplet to singlet ratio is determined by the electron spin density distribution, which controls the rates of intersystem crossing.<\/jats:p>","DOI":"10.1002\/slct.201600688","type":"journal-article","created":{"date-parts":[[2016,8,12]],"date-time":"2016-08-12T02:08:48Z","timestamp":1470967728000},"page":"3343-3356","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["Interstate Crossing\u2010Induced Chemiexcitation Mechanism as the Basis for Imidazopyrazinone Bioluminescence"],"prefix":"10.1002","volume":"1","author":[{"given":"Lu\u00eds","family":"Pinto\u2005da\u2005Silva","sequence":"first","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o em Qu\u00edmica Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias, Universidade do Porto  R. Campo Alegre 687 4169-007 Porto Portugal"}]},{"given":"Carla M.","family":"Magalh\u00e3es","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o em Qu\u00edmica Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias, Universidade do Porto  R. Campo Alegre 687 4169-007 Porto Portugal"}]},{"given":"Joaquim C. G.","family":"Esteves\u2005da\u2005Silva","sequence":"additional","affiliation":[{"name":"Centro de Investiga\u00e7\u00e3o em Qu\u00edmica Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias, Universidade do Porto  R. Campo Alegre 687 4169-007 Porto Portugal"},{"name":"Centro de Investiga\u00e7\u00e3o em Qu\u00edmica Departamento de Geoci\u00eancias, Ambiente e Ordenamento do Territ\u00f3rio Faculdade de Ci\u00eancias, Universidade do Porto  R. 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