Chantarasunthon K.Promkatkaew M.Waranwongcharoen P.Sueksachat A.Prasop N.Norasi T.Sonsiri N.Sansern S.Chomngam S.Wechakorn K.Thana C.Sakulsaknimitr W.Kongsaeree P.Srisuratsiri P.Mahidol University2023-05-192023-05-192023-02-05Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy Vol.286 (2023)13861425https://repository.li.mahidol.ac.th/handle/20.500.14594/81748A novel FRET-based sensor has been designed and developed through the conjugation of naphthyl and rhodamine via propylamine spacer, Naph-Rh. The naphthyl moiety serves as a FRET donor due to its emission spectrum overlapping with the rhodamine B absorption band. Naph-Rh exhibited a selectivity for sensing Fe3+ over other metal ions with a visual color change and fluorescent enhancement. The ratio of the Naph-Rh and Fe3+ was determined to be 1:1 based on Job's plot analysis with a detection limit of 83 nM. The probe exhibited a linear response to Fe3+ in the range of 0–120 μM. Furthermore, the density functional theory (DFT) calculations of Naph-Rh were carried out to rationalize the design and portray the plausible Fe3+ sensing mechanism.ChemistryArticleSCOPUS10.1016/j.saa.2022.1220312-s2.0-8514048639036323091