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All dyes display a bathochromically shifted fluorescent transition from an excited keto state, formed after excited\u2010state intramolecular proton transfer process. A full chemical engineering study was performed by changing the nature of the substitution at the pyridinium site (alkyl or aryl), the position of the pyridinium substitution and the nature of the counterion (six examples). The nature of the radiative transitions observed in these fluorescent dyes was confirmed by Time\u2010dependent density functional theory (TD\u2010DFT) calculations.<\/jats:p>","DOI":"10.1002\/cplu.202500138","type":"journal-article","created":{"date-parts":[[2025,4,15]],"date-time":"2025-04-15T06:07:47Z","timestamp":1744697267000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["N\u2010Aryl or N\u2010Alkyl Pyridinium\u2010Substituted Excited\u2010State Intramolecular Proton Transfer Fluorophores"],"prefix":"10.1002","volume":"90","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7594-6744","authenticated-orcid":false,"given":"Timoth\u00e9e","family":"Stoerkler","sequence":"first","affiliation":[{"name":"Institut de Chimie et Proc\u00e9d\u00e9s pour l\u2019Energie, l\u2019Environnement et la Sant\u00e9 (ICPEES) UMR CNRS 7515, Equipe Chimie Organique pour la Biologie, les Mat\u00e9riaux et l\u2019Optique (COMBO)  25 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