Synthesis and characterization of Sm(III)–hyperbranched poly(ester‐amide) complex

Fang, X. M.; Chen, Rongguo; Xiao, Liren; Chen, Qinghua

doi:10.1002/pi.2922

Cited by 10 publications

(4 citation statements)

References 39 publications

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“…Particularly, we have observed that the carbon signal of the carboxylic acid in the 13 C CP-MAS spectra (cross-polarization and magic angle spinning) is a sensitive parameter to sense the union of Cu(II) to this ligand (RCO 2 H) [34]. Chen et al have also observed similar changes in the 13 C NMR spectra in solution for Sm(III)-hyperbranched poly(ester-amide) [35].…”

Section: Introductionmentioning

confidence: 52%

Insights into the coordination sphere of copper ion in polymers containing carboxylic acid and azole groups

Lázaro-Martínez

Monti

Chattah

2013

Polymer

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Section: Introductionmentioning

confidence: 52%

Insights into the coordination sphere of copper ion in polymers containing carboxylic acid and azole groups

Lázaro-Martínez

Monti

Chattah

2013

Polymer

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“…On the other hand, the ss -NMR technique retrieves information on the ligands involved in the coordination of paramagnetic ions due to the enhancement in the relaxation behavior of different nuclei present in the polymer matrix ( 1 H, 13 C, 15 N, etc.). In particular, we have previously demonstrated that 13 C CP-MAS experiments are effective for studying the preferences in the uptake of copper(II) ions at different concentrations of metal ions in polyelectrolyte and polyampholyte materials; however, some experimental conditions must be taken into account prior to setting the acquisition parameters, such as the contact time used in the cross-polarization steps in the CP-MAS experiments. ,, Also, some other authors have used this strategy to study the coordination of mercury, samarium, and zinc in polymer matrixes. In this work, the 13 C CP-MAS spectra were used to characterize the environment of the Co(II) ions after the uptake of the paramagnetic ions depending the different functional groups present in polymer materials.…”

Section: Resultsmentioning

confidence: 99%

New Insights about the Selectivity in the Activation of Hydrogen Peroxide by Cobalt or Copper Hydrogel Heterogeneous Catalysts in the Generation of Reactive Oxygen Species

et al. 2016

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We report the performance of Co(II) and Cu(II) coordination complexes on H2O2 activation. The heterogeneous catalysts containing aliphatic amine, N-heterocycle, and/or carboxylic acid ligands in hydrogel materials coordinated with Co(II) or Cu(II) were used in this study. These complexes were characterized by solid-state NMR, X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence techniques in order to quantify the superficial and bulk metal ion centers together with the aim of elucidating the ligands involved in the uptake of Co and Cu ions. The release of free radicals on H2O2 activation and the identity of reactive oxygen species were studied by spin trapping using DMPO in electron spin resonance (ESR) experiments. The Co(II) complex/H2O2 systems produced O2, anion superoxide (O2 •–), and hydroxyl radical (OH•), which diffused into the solution at the time that a decrease in pH was detected. A possible catalytic mechanism would involve the Co(II)/Co(III) redox couple, according to XPS results. In the same way, the Cu(II) complex/H2O2 systems produced O2 and OH•, with evidence of Cu(II)/Cu(I) redox cycle. For these catalytic systems, there was no direct evidence of intermediary reactive species. The identity of the ligands played a crucial role in the efficiency of catalytic activation. In addition, in the absence of H2O2, the dissolved O2 was activated by most of the complexes tested, releasing only OH•.

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“…For this reason, the direct polarization or cross-polarization strategies commonly employed in the acquisition of 13 C ss-NMR experiments for structural purposes can detect which segments/regions of the polymeric material are close to the paramagnetic entities. With this aim, different authors have been used NMR as an approach to find out which ligands present in polymeric networks are involved in the coordination of Cu [23,24], Hg [25], Co [23,26], and Sm [27] ions in non-crystalline systems.…”

Section: Resultsmentioning

confidence: 99%

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

Milenković

Mitrović

Algarra

et al. 2019

Plants

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Reports about the influence of cerium-oxide nanoparticles (nCeO2) on plants are contradictory due to their positive and negative effects on plants. Surface modification may affect the interaction of nCeO2 with the environment, and hence its availability to plants. In this study, the uncoated and glucose-, levan-, and pullulan-coated nCeO2 were synthesized and characterized. The aim was to determine whether nontoxic carbohydrates alter the effect of nCeO2 on the seed germination, plant growth, and metabolism of wheat and pea. We applied 200 mgL−1 of nCeO2 on plants during germination (Ger treatment) or three week-growth (Gro treatment) in hydroponics. The plant response to nCeO2 was studied by measuring changes in Ce concentration, total antioxidative activity (TAA), total phenolic content (TPC), and phenolic profile. Our results generally revealed higher Ce concentration in plants after the treatment with coated nanoparticles compared to uncoated ones. Considering all obtained results, Ger treatment had a stronger impact on the later stages of plant development than Gro treatment. The Ger treatment had a stronger impact on TPC and plant elongation, whereas Gro treatment affected more TAA and phenolic profile. Among nanoparticles, levan-coated nCeO2 had the strongest and positive impact on tested plants. Wheat showed higher sensitivity to all treatments.

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Synthesis and characterization of Sm(III)–hyperbranched poly(ester‐amide) complex

Cited by 10 publications

References 39 publications

Insights into the coordination sphere of copper ion in polymers containing carboxylic acid and azole groups

Insights into the coordination sphere of copper ion in polymers containing carboxylic acid and azole groups

New Insights about the Selectivity in the Activation of Hydrogen Peroxide by Cobalt or Copper Hydrogel Heterogeneous Catalysts in the Generation of Reactive Oxygen Species

Interaction of Carbohydrate Coated Cerium-Oxide Nanoparticles with Wheat and Pea: Stress Induction Potential and Effect on Development

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