Quenching of Ofloxacin and Flumequine Fluorescence by Divalent Transition Metal Cations

Park, Hyoung-Ryun; Oh, Chu-Ha; Lee, Hyeong-Chul; Choi, Jae Gyu; Jung, Beung-In; Bark, Ki‐Min

doi:10.5012/bkcs.2006.27.12.2002

Cited by 32 publications

(2 citation statements)

References 17 publications

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“…This is attributed to the chelation with Fe(III) formed through oxidation of Fe(II) in water, diminishing the fluorescence intensity of these compounds (see the example for ENR in Figure S3B and Stern–Volmer plots for each FQ in Figure S4). Although it is an unexpected behavior because coordination complexes generally exhibit greater fluorescence quantum yield than the ligand alone, these observations are in line with the other works reporting FQ fluorescence quenching in presence of Fe(III) and some other transition metals or even with 4-quinolone molecules. − …”

Section: Resultssupporting

confidence: 87%

Fluorescence Spectroscopy and Chemometrics: A Simple and Easy Way for the Monitoring of Fluoroquinolone Mixture Degradation

et al. 2021

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In this work, fluorescence excitation–emission matrices (EEMs), in combination with the chemometric tool and parallel factor analysis (PARAFAC), have been proposed as an unexplored methodology to follow the removal of the fluorescent contaminants of emerging concern, fluoroquinolones (FQs). Ofloxacin, enrofloxacin, and sarafloxacin were degraded by different advanced oxidation processes employing simulated sunlight (hν): photolysis, H2O2/hν, and photo-Fenton. All experiments were performed in ultrapure water at three different pH values: 2.8, 5.0, and 7.0. With the obvious advantage of multivariate analysis methods, EEM-PARAFAC allowed the monitoring of degradation from the overall substances (original and formed ones) through simultaneous, rapid, and cost-efficient fluorescence spectroscopy determinations. A five-component model was found to best fit the experimental data, allowing us to (i) describe the decay of the fluorescence signals of the three parent pollutants, (ii) follow the kinetics profile of FQ-like byproducts with similar EEM fingerprints than the original FQs, and (iii) observe the formation of two families of reaction intermediates with completely different EEMs. Results were finally correlated with high pressure liquid chromatography, total organic carbon, and toxicity tests on Escherichia coli, showing good agreement with all the studied techniques.

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Section: Resultssupporting

confidence: 87%

Fluorescence Spectroscopy and Chemometrics: A Simple and Easy Way for the Monitoring of Fluoroquinolone Mixture Degradation

et al. 2021

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“…In contrast, the emission of particular complexes is significantly quenched in 2-PrOH and acetonitrile solutions, however, with completely different trends. Whereas in 2-PrOH similar emission is observed for most cations as in MeOH, the emission of 3 is quenched by complexation to Fe 2+ , Co 2+ , Ni 2+ , Hg 2+ , and Pb 2+ , which may be explained by the different solvating or coordinating properties of the sterically more demanding 2-PrOH molecules that enables inner-sphere or collision quenching by the then less shielded transition metals [42][43][44][45]. In acetonitrile solution, only complexes of 3 with Zn 2+ and Fe 2+ , and to some extent with Mg 2+ and Pb 2+ , exhibit significant detectable emission, whereas the emission of the other complexes is efficiently quenched.…”

Section: Fluorimetric Detection Of Metal Ionsmentioning

confidence: 72%

Fluorimetric Detection of Zn2+, Mg2+, and Fe2+ with 3-Hydroxy-4-Pyridylisoquinoline as Fluorescent Probe

Pinheiro

Ihmels

2020

J Fluoresc

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The suitability of 3-hydroxy-4-pyridylisoquinoline to operate as fluorescent chemosensor for the detection of metal ions was investigated. For that purpose, the interactions of the title compound with selected metal ions were investigated by absorption and emission spectroscopy. The complexation of Zn2+, Fe2+, Mg2+ with 1:1 and 2:1 stoichiometry leads to characteristic optical responses that depend significantly on the employed solvents, thus allowing for the fluorimetric identification and detection of particular metal cations in a matrix-based pattern analysis or by fluorimetric titrations. Graphical abstract

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Spectroscopic Properties of the Quercetin–Divalent Metal Complexes in Hydro‐Organic Mixed Solvent

Park

Kim

et al. 2018

Bulletin Korean Chem Soc

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The formation and spectroscopic properties of quercetin (QCT)-divalent metal complexes were studied using Cu 2+ , Ni 2+ , Co 2+ , Mn 2+ , Zn 2+ , Mg 2+ , and Ca 2+ in a hydro-organic mixed solvent. The change of UV/visible absorption spectra of QCT due to addition of a metal showed the complex formation. The intensity of fluorescence spectra increased gradually with titration of the metal. The experimental data and theoretical calculation suggest that Cu 2+ , Ni 2+ , Co 2+ , and Mn 2+ coordinate the site between C(3) OH and C(4) O but Zn 2+ prefers to bind to the site between C(5) OH and C(4) O. QCT-Cu 2+ , QCT-Ni 2+ , QCT-Co 2+ , and QCT-Mn 2+ complexes exhibit S 2 ! S 0 fluorescence only as S 1 ! S 0 emission is absent due to the excited-state intramolecular proton transfer (ESIPT) at the S 1 state. As this ESIPT cannot occur at the QCT-Zn 2+ due to the chelation of Zn 2+ at a different site, QCT-Zn 2+ can produce characteristic S 2 ! S 0 and S 1 ! S 0 dual fluorescence.

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Quenching of Ofloxacin and Flumequine Fluorescence by Divalent Transition Metal Cations

Cited by 32 publications

References 17 publications

Fluorescence Spectroscopy and Chemometrics: A Simple and Easy Way for the Monitoring of Fluoroquinolone Mixture Degradation

Fluorescence Spectroscopy and Chemometrics: A Simple and Easy Way for the Monitoring of Fluoroquinolone Mixture Degradation

Fluorimetric Detection of Zn2+, Mg2+, and Fe2+ with 3-Hydroxy-4-Pyridylisoquinoline as Fluorescent Probe

Spectroscopic Properties of the Quercetin–Divalent Metal Complexes in Hydro‐Organic Mixed Solvent

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