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Beyond its pharmaceutical relevance, FFA exhibits pronounced pH-dependent variations in its ultraviolet\u2013visible (UV\u2013Vis) absorption and fluorescence spectra, which remain largely unexplored for functional material applications. In this study, the optical behavior of FFA was systematically investigated over a broad pH range (1\u201314), revealing distinct and reversible spectral changes driven by protonation and deprotonation processes. These pH-responsive optical features were employed to construct molecular logic gates, including implication and an improved \u201cINHIBIT\u201d (IP-INHIBIT) gate, highlighting the potential of FFA as an on\u2013off pH sensor and a promising candidate for organic electronic applications.<\/jats:p>","DOI":"10.1177\/00037028261438136","type":"journal-article","created":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T08:01:18Z","timestamp":1777363278000},"page":"765-773","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["pH-Dependent Luminescence of Flufenamic Acid Utilizing Molecular Logic Gate Operations"],"prefix":"10.1177","volume":"80","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3816-6837","authenticated-orcid":false,"given":"N.C.","family":"Prachalith","sequence":"first","affiliation":[{"name":"R.L. 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