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Particularly, it can be conveniently generated by energy transfer between a photosensitizer's triplet state and triplet dioxygen upon irradiation with visible light. Among the best photosensitizers, substituted zinc(II) phthalocyanines are prominent due to their excellent photophysical properties, which can be tuned by structural modifications, such as halogen\u2010 and chalcogen\u2010atom substitution. These patterns allow for the enhancement of spin\u2010orbit coupling, commonly attributed to the heavy atom effect, which correlates with the atomic number (\n) and the spin\u2010orbit coupling constant (\n) of the introduced heteroatom. Herein, a fully systematic analysis of the effect exerted by chalcogen atoms on the photophysical characteristics (absorption and fluorescence properties, lifetimes and singlet dioxygen photogeneration), involving 30 custom\u2010made \u03b2\u2010tetrasubstituted chalcogen\u2010bearing zinc(II) phthalocyanines is described and evaluated regarding the heavy atom effect. Besides, the intersystem crossing rate constants are estimated by several independent methods and a quantitative profile of the heavy atom is provided by using linear correlations between relative intersystem crossing rates and relative atomic numbers. Good linear trends for both intersystem crossing rates (S1<\/jats:sub>\u2010T1<\/jats:sub> and T1<\/jats:sub>\u2010S0<\/jats:sub>) were obtained, with a dependency on the atomic number and the spin\u2010orbit coupling constant scaling as \n and \n, respectively The trend shows to be independent of the solvent and temperature.<\/jats:p>","DOI":"10.1002\/chem.202304083","type":"journal-article","created":{"date-parts":[[2024,4,22]],"date-time":"2024-04-22T09:16:22Z","timestamp":1713777382000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["A Case\u2010Study on the Photophysics of Chalcogen\u2010Substituted Zinc(II) Phthalocyanines"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1574-3694","authenticated-orcid":false,"given":"Sergio D.","family":"Ezquerra Riega","sequence":"first","affiliation":[{"name":"Universidad de Buenos Aires, Facultad de Farmacia y Bioqu\u00edmica Departamento de Ciencias Qu\u00edmicas Jun\u00edn 956 C1113AAD Buenos Aires Argentina"},{"name":"Universidad de Buenos Aires Instituto de Tecnolog\u00eda Farmac\u00e9utica y Biofarmacia (InTecFyB) Jun\u00edn 956 C1113AAD Buenos Aires Argentina"},{"name":"CONICET - Universidad de Buenos Aires Instituto de Qu\u00edmica F\u00edsica de los Materiales Medio Ambiente y Energ\u00eda (INQUIMAE); Departamento de Qu\u00edmica Inorg\u00e1nica, Anal\u00edtica y Qu\u00edmica F\u00edsica Facultad de Ciencias Exactas y Naturales, UBA. 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