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

Lázaro-Martínez, Juan Manuel; Monti, Gustavo A.; Chattah, Ana K.

doi:10.1016/j.polymer.2013.07.036

Cited by 17 publications

(31 citation statements)

References 50 publications

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“…Hence, the EPR lines reflect that the coordination sphere of copper is changing due to the shift to high field values of the EPR lines associated to the nitrogen active role in the coordination to copper that increased the A // values and reduced the g // values in comparison with the oxygen surrounding of the paramagnetic center in the Cu-Mt sample before the addition of TBZ or IMZ (Gamba et al 2017b;Heller-Kallai and Mosser 1995;Donoso et al 2013). Although the high density of Cu 2+ affected the resolution in the hyperfine region, an A // constant can be estimated in1 60 G for the Cu 2+ centers in Mt-Cu-IMZ sample, which was similar to those reported in a rich nitrogen coordination sphere for some copper complexes in ethylenediamine- bentonite (Donoso et al 2013), imidazole-containing polymers (Lázaro-Martínez et al 2013), and mesoporous silica (Abry et al 2009). On the other hand, a broad and unresolved hyperfine EPR signal was observed due to the proximity of the paramagnetic Cu 2+ centers suffering spin-orbit and exchange interactions in Mt-Cu-TBZ sample (Fig.…”

Section: Sample Characterizationsupporting

confidence: 79%

Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence

Gamba

Lázaro-Martínez

Olivelli

et al. 2018

Environ Sci Pollut Res

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The simultaneous adsorption of both imazalil (IMZ) and thiabendazole (TBZ) fungicides in a Cu 2+-exchanged Mt was studied in this work. Kinetic studies were used to determine the rate law which describes the adsorption of individual fungicides onto the adsorbent. Adsorption isotherm of individual and combined fungicides was done to evaluate synergic or antagonistic effects. The Mt-Cu material considerably improved TBZ and/or IMZ adsorption from aqueous suspensions with respect to raw Mt, leading to removal efficiencies higher than 99% after 10 min of contact time for TBZ and IMZ C i = 15 and 40 mg/L, respectively, when a solid dosage = 1 g/L was used. The adsorption sites involved were determined by a combination of X-ray diffraction (XRD) determinations and electron paramagnetic resonance (EPR), indicating that fungicides were bonded to Cu 2+ cations, while the rate limiting step was the formation of coordination bonds. The adsorption mechanism proposed is that of ligand exchange between water and fungicide molecules in the metal coordination sphere. The single-crystal structure for the IMZ-Cu 2+ complex indicated that four molecules were bounded to the copper centers, while two molecules of TBZ are bounded to copper explaining the higher IMZ uptake capacity for the Mt-Cu material.

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Section: Sample Characterizationsupporting

confidence: 79%

Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence

Gamba

Lázaro-Martínez

Olivelli

et al. 2018

Environ Sci Pollut Res

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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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“…Equations and were employed to interpret the experimental data. The pseudo second order kinetic model has often been used to fit the experimental kinetic adsorption data and determine whether an adsorption process is dominated by the chemical adsorption phenomenon …”

Section: Resultsmentioning

confidence: 99%

“…The pseudo second order kinetic model has often been used to fi t the experimental kinetic adsorption data and determine whether an adsorption process is dominated by the chemical adsorption phenomenon. [40][41][42] The linearized pseudo second order kinetic equation usually takes the following form…”

Section: Metals Ions Uptakesmentioning

confidence: 99%

Biosourced Cyclic and Multicyclic Polyesters Based on 1,4:3,6-Dianhydrohexitols: Application to Metal Ions Uptake in Aqueous Media

Bennour¹,

Fildier

Chatti

et al. 2015

Macromol. Chem. Phys.

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Authors want to thank all INRAP staff for analysis and helpful discussion. M. Mezni is acknowledged for NMR experiments, R. Jebali and N. Chaabane for ICP analysis.International audienceIsosorbide and isomannide are polycondensed in solution with trimesoyl chloride at a concentration of 0.06 mol L-1 for the synthesis of cyclic and multicyclic polyesters. The feed ratio diol/trimesoyl chloride is varied from 1.0/1.0 to 1.6/1.0. As all obtained polyesters prove insoluble, innovative solvent-free matrix assisted laser desorption ionization time-of-flight mass spectrometry (MALDI ToF MS) is performed for their characterization. The influence of the stereochemistry is shown to be of great importance for the cyclization trend. Both isosorbide and isomannide lead mainly to cyclic and multicyclic structures at a feed ratio of 1.0/1.0 and 1.1/1.0. Isomannide gives higher fractions of multicyclic structures. The products are characterized by complementary techniques such as C-13 cross polarization magic angle spinning nuclear magnetic resonance (C-13 CP-MAS NMR) and differential scanning calorimetry measurements. Application as a cryptands for the uptake of metal ions in aqueous media is followed by inductively coupled plasma atomic emission spectroscopy (ICP AES) analysis and reveal efficient toward large range of metals with tunable selectivity depending on the starting diol

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

Cited by 17 publications

References 50 publications

Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence

Kinetic and equilibrium adsorption of two post-harvest fungicides onto copper-exchanged montmorillonite: synergic and antagonistic effects of both fungicides’ presence

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

Biosourced Cyclic and Multicyclic Polyesters Based on 1,4:3,6-Dianhydrohexitols: Application to Metal Ions Uptake in Aqueous Media

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