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This study explores the use of Ni(II) and Co(II) octaazacryptates complexes as catalysts in the presence of different ionic liquids under blue LED and solar light conditions. By employing a systematic approach to vary ionic liquid concentrations and light sources, the catalytic performance was assessed in terms of CO production, H<jats:sub>2<\/jats:sub> production, CO selectivity, turnover number, and photoreaction quantum yield. The findings reveal that ionic liquid 1\u2010ethyl\u20104\u2010picolinium triflate significantly enhances CO<jats:sub>2<\/jats:sub> reduction efficiency under solar light, with the highest CO yield of 15.75\u00a0\u00b5mol and CO turnover number of 1575 observed when using 2%w\/w of the ionic liquid. Conversely, higher ionic liquid concentrations improved selectivity at the expense of CO production. The experiments conducted under sunlight demonstrated a compromise between selectivity and turnover, with the highest CO turnover number achieved for ionic liquid experiments, but greater selectivity in the absence of ionic liquid. These results underscore the importance of ionic liquid concentration in modulating catalytic performance, while also highlighting the potential of direct sunlight as a sustainable and powerful energy source for scalable, eco\u2010friendly CO<jats:sub>2<\/jats:sub> photoreduction systems.<\/jats:p>","DOI":"10.1002\/cctc.202402036","type":"journal-article","created":{"date-parts":[[2025,3,11]],"date-time":"2025-03-11T16:59:28Z","timestamp":1741712368000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Photocatalytic CO\u2082 Reduction Using Ni(II) and Co(II) Cryptates: Influence of Ionic Liquids and Light Sources"],"prefix":"10.1002","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1941-2470","authenticated-orcid":false,"given":"Rafaela T.","family":"Marques","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade de Lisboa  Campo Grande Lisboa 1749\u2010016 Portugal"}]},{"given":"Jana\u00edna C.","family":"Almeida","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade de Lisboa  Campo Grande Lisboa 1749\u2010016 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1066-1200","authenticated-orcid":false,"given":"Sara","family":"Realista","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural Institute of Molecular Sciences Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade de Lisboa  Campo Grande Lisboa 1749\u2010016 Portugal"}]},{"given":"Vitoria","family":"Paz","sequence":"additional","affiliation":[{"name":"LAQV\u2010REQUIMTE NOVA School of Science and Technology NOVA University of Lisbon  Caparica 2829\u2010516 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