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Both compounds were subsequently oxidized by DDQ to produce dicinnamoyl dipyrromethene ligands (<jats:bold>DC\u20101<\/jats:bold> and <jats:bold>DC\u20102<\/jats:bold>). A large bathochromic shift compared to dipyromethene (<jats:bold>D<\/jats:bold>) was observed at 95\u2005nm for <jats:bold>DC\u20101<\/jats:bold> and 67\u2005nm for <jats:bold>DC\u20102<\/jats:bold>. Both compounds showed remarkable chelation\u2010enhanced fluorescence (CHEF) upon addition of zinc(II) ions. Similar to the quadrupolar system, <jats:bold>DC\u20101<\/jats:bold> exhibited absorption and emission near the optical windows of the tissue. However, asymmetrical <jats:bold>DC\u20102<\/jats:bold> had a better \u201cturn\u2010on\u201d CHEF, with a fluorescence intensity that was 22\u2005times higher than that of compound <jats:bold>D<\/jats:bold>. The <jats:bold>DC\u20102<\/jats:bold> ligand also showed a limit of detection (LOD) of up to 3.0\u00d710<jats:sup>\u22128<\/jats:sup>\u2005M and selectivity toward zinc(II) ions compared to alkali and alkaline earth metal ions.<\/jats:p>","DOI":"10.1002\/asia.202300187","type":"journal-article","created":{"date-parts":[[2023,5,1]],"date-time":"2023-05-01T11:49:40Z","timestamp":1682941780000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Cinnamoyl Dipyrromethenes as Fluorescence Zinc(II) Ion Sensor"],"prefix":"10.1002","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5549-0276","authenticated-orcid":false,"given":"Dikhi","family":"Firmansyah","sequence":"first","affiliation":[{"name":"Organic Chemistry Research Division Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung  Jl. 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