Luminescent properties of 4‐aminobenzo‐15‐crown‐5 after preferential binding of ferric ions in aqueous solutions

Abstract

We report a combined approach that introduces the use of 4-aminobenzo-15-crown-5 (4AB15C5) for the detection of ferric(III) ions by colorimetric, ultraviolet (UV)-visible light absorption, fluorescence, and live-cell imaging techniques along with density functional theory (DFT) calculations. We have found that 4AB15C5 is sensitive and selective for binding ferric(III) ions in aqueous solutions. DFT calculations using the polarizable continuum model have been used to explain the strong binding of the ferric ion by 4AB15C5 in aqueous solutions. The detection limit in the fluorescence quenching measurements was found to be as low as 50 μM for the ferric ion with a determined Stern-Volmer constant of 1.52 × 10 M . Fluorescence intensity did not change for other ions tested, Fe , Co , Mn , Mg , Zn , Ca , NH , Na , and K ions. Live-cell fluorescence imaging was also used to check the intracellular variations in ferric ion levels. Our spectroscopic data indicated that 4AB15C5 can bind ferric ions selectively in aqueous solutions.

Water Molecules on the Epoxide Groups of Graphene Oxide Surfaces

“…We performed DFT calculations using the Gaussian 09 program at the level of spin restricted B3LYP/6‐311G(d,p) using Gaussian 09 …”

“…20 GO sheets contain oxygenated functional groups such as carboxyl (−COOH), hydroxyl (−OH), and epoxy (C−O −C) groups. We performed DFT calculations using the Gaussian 09 program at the level of spin restricted B3LYP/6-311G(d,p) using Gaussian 09.…”

A novel selective fluorescent chemosensor for Fe3+ ions based on phthalonitrile dimer: synthesis, analysis, and theoretical studies

“…As shown in Table 1, phthalonitrile compound (3) was found able to determine different concentrations of spiked Fe 3+ with good recovery, indicating that phthalonitrile compound (3) can potentially be employed for detecting Fe 3+ in real samples. In addition, analytical parameters of phthalonitrile compound (3) for Fe 3+ determination were compared with some other Fe 3+ -selective fluorescent sensor studies [26][27][28][29][30]. As seen in Table 2, the phthalonitrile compound (3) showed lower LOD and larger linear range than the given fluorescent sensors studied in the literature.…”