Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

Martín-Ramos, Pablo; Costa, Ana; Silva, Manuela Ramos; Pereira, Laura C. J.; Silva, Pedro S. Pereira da; Melo, J. Sérgio Seixas de; Martín‐Gil, Jesús

doi:10.1590/1980-5373-mr-2015-0448

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…Similarly, the free SCZ ligand has a band in 276 nm assigned to the n→π transition and maintained in the metal spectrum. Several uranyl complexes showed weaker bands that can be not distinguished easily at low concentrations, although a band at 447 nm in the [(UO 2 )(OAc) 2 (SCZ)] was observed and could arise from partially forbidden charge transfer transitions to non-bonding, unoccupied f-orbitals [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

Complexation of uranyl (UO2)2+ with bidentate ligands: XRD, spectroscopic, computational, and biological studies

et al. 2021

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Three new uranyl complexes [(UO2)(OAc)2(CMZ)], [(UO2)(OAc)2(MP)] and [(UO2)(OAc)2(SCZ)] were synthesized and characterized by elemental analysis, FT-IR, UV-Vis spectroscopy, powder XRD analysis, and molar conductivity. The IR analysis confirmed binding to the metal ion by the sulfur and ethoxy oxygen atoms in the carbimazole (CMZ) ligand, while in the 6-mercaptopurine (MP) ligand, the sulfur and the N7 nitrogen atom of a purine coordinated binding to the metal ion. The third ligand showed a 1:1 molar ratio and bound via sulfonamide oxygen and the nitrogen of the pyrimidine ring. Analysis of the synthesized complexes also showed that acetate groups had monodentate binding to the (UO22+). Density Functional Theory (DFT) calculations at the B3LYP level showed similar structures to the experimental results. Theoretical quantum parameters predicted the reactivity of the complexes in the order, [(UO2)(OAc)2(SCZ)] > [(UO2)(OAc)2(MP)]> [(UO2)(OAc)2(CMZ)]. DNA binding studies revealed that [(UO2)(OAc)2(SCZ)] and [(UO2)(OAc)2(CMZ)] have the highest binding constant (Kb) among the uranyl complexes. Additionally, strong binding of the MP and CMZ metal complexes to human serum albumin (HSA) were observed by both absorbance and fluorescence approaches. The antibacterial activity of the complexes was also evaluated against four bacterial strains: two gram-negative; Escherichia coli and Klebsiella pneumonia, and two gram-positive; Staphylococcus aureus and Streptococcus mutans. [(UO2)(OAc)2(MP)] had the greatest antibacterial activity against Klebsiella pneumonia, the gram-positive bacteria, with even higher activity than the standard antibiotic. In vitro cytotoxicity tests were also performed against three human cancer lines, and revealed the most cytotoxic complexes to be [(UO2)(OAc)2(SCZ)], which showed moderate activity against a colon cancer cell line. Thus, uranyl addition enhances the antibacterial and anticancer properties of the free ligands.

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Section: Resultsmentioning

confidence: 99%

Complexation of uranyl (UO2)2+ with bidentate ligands: XRD, spectroscopic, computational, and biological studies

et al. 2021

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“…When UO 2 2+ (from 0.5 to 3 equivalents in 0.5 equivalent steps) was added to compound 1 , the absorption peak intensities at 300 and 350 nm decreased until up to 2 equivalents of UO 2 2+ were added. At 2.5 or more equivalents of UO 2 2+ , the ligand-to-metal charge transfer absorption wavelength between compound 1 and UO 2 2+ was observed at around 365–380 nm [23].…”

Section: Resultsmentioning

confidence: 99%

“…The carbonyl oxygen (C=O) of the end group of acetic acids (–CH 2 COOH) in compound 1 is well known to bind strongly to a radionuclide ion such as UO 2 2+ by supplying electrons [23,24]. IR spectroscopy was used to classify the complex formation of compound 1 with UO 2 2+ .…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Study of the Salicyladazine Derivative–UO22+ Complex and Its Immobilization to Mesoporous Silica

Park

Lee

et al. 2019

Nanomaterials

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Uranyl ion, the most soluble toxic uranium species, is recognized as an important index for monitoring nuclear wastewater quality. The United States Environmental Protection Agency (US EPA) and the World Health Organization (WHO) prescribed 30 ppb as the allowable concentration of uranyl ion in drinking water. This paper reports on a nanohybrid material that can detect uranyl ions spectroscopically and act as a uranyl ion absorbent in an aqueous system. Compound 1, possessing a salicyladazine core and four acetic acid groups, was synthesized and the spectroscopic properties of its UO22+ complex were studied. Compound 1 had a strong blue emission when irradiated with UV light in the absence of UO22+ that was quenched in the presence of UO22+. According to the Job’s plot, Compound 1 formed a 1:2 complex with UO22+. When immobilized onto mesoporous silica, a small dose (0.3 wt %) of this hybrid material could remove 96% of UO22+ from 1 mL of a 100-ppb UO22+ aqueous solution.

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Structures and optical spectroscopy of lanthanide trifluoroacetates obtained from hexafluoroacetylacetone

Tsaryuk

Вологжанина

Zhuravlev

et al. 2017

Journal of Fluorine Chemistry

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Luminescent Properties of [UO2(TFA)2(DMSO)3], a Promising Material for Sensing and Monitoring the Uranyl Ion

Cited by 3 publications

References 6 publications

Complexation of uranyl (UO2)2+ with bidentate ligands: XRD, spectroscopic, computational, and biological studies

Complexation of uranyl (UO2)2+ with bidentate ligands: XRD, spectroscopic, computational, and biological studies

Spectroscopic Study of the Salicyladazine Derivative–UO22+ Complex and Its Immobilization to Mesoporous Silica

Structures and optical spectroscopy of lanthanide trifluoroacetates obtained from hexafluoroacetylacetone

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