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Littérature scientifique sur le sujet « Complexes de Fe(III) »

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Publié le 4 mai 2024

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Articles de revues sur le sujet "Complexes de Fe(III)"

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Rai, Dhanpat, Mikazu Yui et Dean A. Moore. « Isosaccharinate Complexes of Fe(III) ». Journal of Solution Chemistry 41, no 11 (7 novembre 2012) : 1906–21. http://dx.doi.org/10.1007/s10953-012-9911-7.

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Chen, Shangjun, Lu An et Shiping Yang. « Low-Molecular-Weight Fe(III) Complexes for MRI Contrast Agents ». Molecules 27, no 14 (18 juillet 2022) : 4573. http://dx.doi.org/10.3390/molecules27144573.

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Fe(III) complexes have again attracted much attention for application as MRI contrast agents in recent years due to their high thermodynamic stability, low long-term toxicity, and large relaxivity at a higher magnetic field. This mini-review covers the recent progress on low-molecular-weight Fe(III) complexes, which have been considered as one of the promising alternatives to clinically used Gd(III)-based contrast agents. Two kinds of complexes including mononuclear Fe(III) complexes and multinuclear Fe(III) complexes are summarized in sequence, with a specific highlight of the structural relationships between the complexes and their relaxivity and thermodynamic stability. In additional, the future perspectives for the design of low-molecular-weight Fe(III) complexes for MRI contrast agents are suggested.
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Xue, Xiao Fei, Yan Xiang Liu, Yan Qing Shao et Nan Sheng Deng. « Rapid Decolorization of Rhodamine B by UV/Fe(III)-Penicillamine Process under Neutral pH : Compared with UV/Fe(III)-Oxalate ». Advanced Materials Research 183-185 (janvier 2011) : 130–34. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.130.

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This study investigated the decolorization of Rhodamine B by the UV/Fe(III)-Oxalate and UV/Fe(III)-Penicillamine process under neutral pH. Fe(III)-Penicillamine complexes showed much higher photoactivity than that of Fe(III)-Oxalate complexes. The efficiency for decolorization of Rhodamine B at pH 5.0 was 59% and 88% in Fe(III)-Oxalate and Fe(III)-Penicillamine complexes aqueous solution after 60 min irradiation, respectively, whereas, 35% and 57% was achieved at pH 7.0. Compared to the Fe(III)/Oxalate system, the kinetic constants kapp (min-1) for Rhodamine B decolorization in Fe(III)/Penicillamine system increased 2.4 and 2.0 times at pH 5.0 and 7.0, respectively. According to the obtained results, it was quite reasonable to conclude that penicillamine should play a similar role in Fe(III)-Penicillamine aqueous solution as oxalate did in Fe(III)-Oxalate solution. The results obtained indicated that the UV/Fe(III)-Penicillamine process was probably an alternative method to treat dye pollutant at neutral pH condition.
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Hassen, Jasim, et Jack Silver. « Stability of Fe(III) and Sn(IV) Metalloporphyrins Adsorbed on Cation-Exchanged Montmorillonite ». Trends in Sciences 19, no 8 (27 mars 2022) : 3426. http://dx.doi.org/10.48048/tis.2022.3426.

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The iron(III)tetraphenylporphyrin chloride Fe(III)TPPCl, iron(III)tetra-naphthylporphyrin Fe(III)TNPCl, μ-oxo-bis[tetraphenylporphyriniron(III)] [(Fe(III)TPP)2O], μ-oxo-bis[tetranaphthylporphyriniron(III)] [(Fe(III)TNP)2O], tin(IV)tetraphenylporphyrin chloride Sn(IV)TPPCl2 and tin(IV)tetra-naphthylporphyrin Sn(IV)TNPCl2 complexes were all found to be adsorbed onto the montmorillonite MMT clay without demetallation. The evidence from the visible absorption and diffuse reflectance spectra all showed that the species present on the montmorillonite are the metallated form. Also the evidence from Mossbauer spectroscopy confirm these findings. The only process that occurs is that the dimeric form of the iron complexes underwent transformation to the monomeric form. The clay-complex systems were characterized using visible absorption spectra, diffuse reflectance spectra, X-ray diffraction, Mossbauer spectra and Electron microscopy. HIGHLIGHTS Fe(III)TPPCl, Fe(III)TNPCl, Sn(IV)TPPCl2, and Sn(IV)TNPCl2 porphyrin complexes adsorbed onto the montmorillonite clay without demetallation The dimeric forms of iron porphyrin complexes [(Fe(III)TPP)2O] and [(Fe(III)TNP)2O are converted to the monomeric form when adsorbed on montmorillonite clay The weak acidity of montmorillonite clay does not have the ability to cause demetallation of the metallo complexes of porphyrin
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Ansari, Khairul I., Sahba Kasiri, James D. Grant et Subhrangsu S. Mandal. « Fe(III)-Salen and Salphen Complexes Induce Caspase Activation and Apoptosis in Human Cells ». Journal of Biomolecular Screening 16, no 1 (2 novembre 2010) : 26–35. http://dx.doi.org/10.1177/1087057110385227.

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To explore the apoptotic and antitumor activities of metallo-salens, the authors have synthesized several Fe(III)-salen and salphen complexes and analyzed their effects on human cancer and noncancer cells. Their results demonstrated that Fe(III)-salen and salphen complexes affect cell viability and induce nuclear fragmentation and apoptosis in breast cancer (MCF7) cells. The IC50 values for the active metallo-salen complexes ranged between 0.3 and 22 µM in MCF7 cells. Biochemically active Fe(III)-salen and salphen complexes induced caspase-3/7 activation and release of cytochrome c from the mitochondria to cytosol, suggesting the involvement of the mitochondrial pathway of apoptosis. Comparison of IC50 values toward 3 different cell lines demonstrated that selected Fe(III)-salen complexes induce tumor cell-selective apoptosis in cultured cells. Overall, the studies demonstrated that Fe(III)-salen and salphen complexes induced efficient apoptosis in cultured human cells. The nature of the substituents and the bridging spacer between diamino groups play critical roles in determining the apoptotic activities of Fe(III)-salen and salphen complexes.
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Manimaran, P., et S. Balasubramaniyan. « Synthesis, Characterization and Biological Evaluation of Fe(III) and Cu(II) Complexes with 2,4-Dinitrophenyl hydrazine and Thiocyanate Ions ». Asian Journal of Chemistry 31, no 4 (27 février 2019) : 780–84. http://dx.doi.org/10.14233/ajchem.2019.21719.

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The metal complexes of Fe(III) and Cu(II) were prepared by using 2,4-dinitrophenyl hydrazine (DNPH) and thiocyanate (SCN) with stirrer refluxed for about 6 h. The prepared Fe(III) and Cu(II) complexes were characterized by elemental analysis, molar conductance, magnetic susceptibility and electronic spectrum, FT-IR spectral studies. The result suggested the octahedral geometry for Fe(III) and Cu(II) complexes. Powder X-ray diffraction indicate the crystalline nature of the metal complexes. The antimicrobial activities of the Fe(III) and Cu(II) complexes were tested with various micro organisms by disc diffusion method. The antimicrobial results indicate that the metal complexes are highly active with compared to the free ligand. The in vitro antioxidant activity of the free ligand and its metal complexes was assayed by radical scavenging activity (DPPH). The result proposed that Fe (III) and Cu(II) complexes exhibited strong antioxidant activity than that of the ligand.
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K. Dideriksen, J. A. Baker et S. L. S. Stipp. « Fe isotope fractionation between inorganic aqueous Fe(III) and a Fe siderophore complex ». Mineralogical Magazine 72, no 1 (février 2008) : 313–16. http://dx.doi.org/10.1180/minmag.2008.072.1.313.

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AbstractIn oxic waters, dissolved Fe exists dominantly as Fe(III) complexes with strongly coordinating, siderophore-like ligands. In this study, we have determined an equilibrium Fe isotope fractionation of 0.6% (∆56Fe) between inorganic Fe(III) and Fe(III) siderophore complexes using the siderophore desferrioxamine B as a model compound. The 57Fe tracer experiments show that the Fe isotopes ofthe siderophores exchange readily with dissolved inorganic Fe. The results indicate that organic ligands are likely to be important in the generation ofFe isotope signatures in oxic environments. For example, the isotopic composition ofmarine Fe-Mn nodules may largely be due to the presence of strongly coordinating ligands.
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Melník, Milan, et Marian Koman. « Pyridine-2,6-dicarboxylates in monomeric iron complexes – structural aspects ». Reviews in Inorganic Chemistry 40, no 2 (25 juin 2020) : 75–89. http://dx.doi.org/10.1515/revic-2019-0017.

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AbstractThis review includes 70 monomeric high-spin complexes of the following general compositions: [Fe(II)(η3-pdc)(L)3], [Fe(III)(η3-pdc)(L)3]+, [Fe(II)(η3-pdc)2]2− and [Fe(III)(η3-pdc)2]− (pdc = pyridine-2,6-dicarboxylate (−2)). Each Fe(II) atom has a distorted octahedral geometry. The Fe(III) atoms have a distorted octahedral geometry (most common) and in some examples have a distorted pentagonal-bipyramidal geometry. The chelating donor ligands create varieties of n-membered metallocyclic rings: ONO, OCO, NC2N, OC2N, OC2NO and OC3O. Some cooperative effects between Fe(II) and Fe(III) complexes were found and discussed. There are complexes that are examples of distortion isomerism.
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Monreal-Corona, Roger, Jesse Biddlecombe, Angela Ippolito et Nelaine Mora-Diez. « Theoretical Study of the Iron Complexes with Lipoic and Dihydrolipoic Acids : Exploring Secondary Antioxidant Activity ». Antioxidants 9, no 8 (28 juillet 2020) : 674. http://dx.doi.org/10.3390/antiox9080674.

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The thermodynamic stability of twenty-nine Fe(III) complexes with various deprotonated forms of lipoic (LA) and dihydrolipoic (DHLA) acids, with coordination numbers 4, 5 and 6, is studied at the M06(SMD)/6-31++G(d,p) level of theory in water under physiological pH conditions at 298.15 K. Even though the complexes with LA- are more stable than those with DHLA−, the most thermodynamically stable Fe(III) complexes involve DHLA2−. The twenty-four exergonic complexes are used to evaluate the secondary antioxidant activity of DHLA and LA relative to the Fe(III)/Fe(II) reduction by O2•− and ascorbate. Rate constants for the single-electron transfer (SET) reactions are calculated. The thermodynamic stability of the Fe(III) complexes does not fully correlate with the rate constant of their SET reactions, but more exergonic complexes usually exhibit smaller SET rate constants. Some Cu(II) complexes and their reduction to Cu(I) are also studied at the same level of theory for comparison. The Fe(III) complexes appear to be more stable than their Cu(II) counterparts. Relative to the Fe(III)/Fe(II) reduction with ascorbate, DHLA can fully inhibit the formation of •OH radicals, but not by reaction with O2•−. Relative to the Cu(II)/Cu(I) reduction with ascorbate, the effects of DHLA are moderate/high, and with O2•− they are minor. LA has minor to negligible inhibition effects in all the cases considered.
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Rastogi, Raj Kamal, Sonu Sharma, Gulshan Rastogi et Alok K. Singh. « SYNTHESIS AND CHARACTERIZATION OF TI (III), V (III),VO (IV), MOO (V),FE (II) AND FE (III) COMPLEXES OF BENZIL- 2,4-DINITROPHENYL HYDRAZONE P-BROMO ANILINE ». Green Chemistry & ; Technology Letters 2, no 4 (14 décembre 2016) : 177. http://dx.doi.org/10.18510/gctl.2016.242.

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The complexes of Benzil-2, 4-dinitrophenyl hydrazone-p- bromo aniline with Ti(III),V(III), VO(IV),MoO (V), Fe(II), Fe(III) have synthesized and characterized by elemental analysis, magnetic measurement data, molar conductance, TGA,UV-visible and IR spectra data. The complexes of Ti (III), V (III), Fe (II) and Fe (III) have octahedral geometry while VO (IV) and MoO(V) have distorted octahedral geometry due to the presence of M=O moiety.
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Thèses sur le sujet "Complexes de Fe(III)"

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Ingle, Shaktisingh K. « Photoactive fe(III) complexes of -hydroxy acid containing ligands ». Cincinnati, Ohio : University of Cincinnati, 2006. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1144708291.

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Paul, S. « Structure, properties and application of conducting polymers containing organo Fe(II)/Fe(III) complexes ». Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2007. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2615.

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Jones, Morris Edward. « Soluble organic-Fe(III) complexes : rethinking iron solubility and bioavailability ». Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42940.

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The bioavailability of iron is limited by the solubility of Fe(III) at circumneutral pH. In the High Nutrient-Low Chlorophyll (HNLC) zones of the ocean, the natural or anthropogenic addition of iron stimulates primary productivity and consumes carbon dioxide. As a result, iron fertilization has been proposed to mitigate anthropogenic carbon emissions and lower global temperatures. The natural sources of iron to the ocean are not fully constrained and include eolian depositions as well as inputs from continental shelf sediments, rivers, hydrothermal vents, and icebergs. Regardless of their source, the effectiveness of iron additions in promoting carbon fixation depends on the presence of organic ligands either natural or produced by microorganisms that stabilize or solubilize Fe(III) at neutral pH. For example, siderophores are well known to be expressed extracellularly by prokaryotes in the photic zones of the oceans to increase the bioavailability of iron. In this dissertation, the production of iron nanoparticles is demonstrated in vent fluids from the 90 North hydrothermal system. These iron nanoparticles may either catalyze the oxidation of sulfide to thiosulfate and produce a potential electron acceptor for microbial respiration or provide a source of iron that stimulates primary production at great distances from the hydrothermal vents. In addition, dissolved iron under the form of soluble organic-Fe(III) complexes is demonstrated to constitute a significant source of iron in estuarine sediments that receive large amounts of particulate iron from flocculation and precipitation at the salinity transition of this estuary. A novel competitive ligand equilibration absorptive cathodic stripping voltammetry (CLE-ACSV) technique reveals that the speciation of iron changes from largely colloidal or particulate in the upper estuary to truly dissolved organic-Fe(III) in the lower estuary. It is also demonstrated that organic-Fe(III) complexes are produced far below the sediment-water interface, suggesting that dissimilatory iron-reducing bacteria may play an important role in their production. These complexes then diffuse across the sediment-water interface and provide a significant source of iron to the continental shelf. The mechanism of reduction of iron oxides by iron-reducing bacteria is not fully understood and presents a unique physiological problem for the organism, as the terminal reductase has to transfer electrons to a solid electron acceptor. In this dissertation, it is demonstrated for the first time using random mutagenesis that the respiration of solid Fe(III) oxides by Shewanella oneidensis, a model iron-reducing prokaryote, first proceeds through a non-reductive dissolution step involving organic ligands that are released extracellularly by the cells. These soluble complexes are then reduced by the organism to produce Fe(II) and recycle the ligand for additional solubilization. Incubations with deletion mutants of the proteins involved in the respiration of Fe(III) revealed that the type-II secretion system, which translocates proteins on the outer membrane of gram-negative bacteria, is involved in the production of organic-Fe(III) complexes by secreting an endogenous iron-solubilizing ligand or a protein involved in the biosynthesis of this ligand on the outer membrane. In addition, periplasmic decaheme cytochromes produced by Shewanella appear to be involved in the mechanism of production of the endogenous organic ligand either directly or through a sensing mechanism that controls its production. In turn, two decaheme cytochromes positioned on the outer-membrane and hypothesized to be involved in the electron transfer to the mineral surface do not appear to be involved in the solubilization mechanism, suggesting either that the cells regulate the ligand production via periplasmic sensing systems or that these cytochromes are not involved in the solubilization mechanism. Altogether this research shows the production of organic-Fe(III) complexes in sediments generates a significant flux of dissolved iron to support primary production in continental shelf waters and that these complexes may be partly produced by iron-reducing bacteria. Indeed, experiments with a model organism demonstrate dissimilatory iron reducing bacteria produce endogenous organic ligands with high iron-binding constants to non-reductively solubilize iron oxides during the anaerobic respiration of iron oxides. The organic ligand is apparently recycled several times to minimize the energy cost associated with its biosynthesis. These findings demonstrate that the solubilization of iron oxides by organic ligands may be an important, yet underappreciated process in aquatic systems.
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INGLE, SHAKTISINGH K. « Photoactive Fe(III) complexes of α-hydroxy acid containing ligands ». University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1144708291.

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Greene, Shannon Nicolle. « Computational studies of Fe-type nitrile hydratase and related mononuclear, non-heme Fe(III) complexes ». [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013070.

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Wang, Lei. « Photodegradation of organic pollutants induced by Fe(III)-caoxylate complexes in aqueous solution ». Clermont-Ferrand 2, 2008. https://tel.archives-ouvertes.fr/tel-00728829.

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La photodégradation de l'herbicide 2,4-D (acide 2,4-dichlorophénoxyacétique) et de son principal photoproduit (2,4-DCP) en présence de trois complexes Fe(III)-carboxylate (citrate, pyruvate, tartrate) a été étudiée. Les rendements quantiques de disparition du 2,4-D augmentent dans cet ordre : Fe(III)-TAr < Fe(III)-Cit < Fe(OH)2+ < Fe(III)-Pyr. Le même mécanisme de dégradation du 2,4-D est observé pour les trois complexes de fer et correspond à celui déjà décrit avec des processus généraux de radicaux hydroxyle. Le 2,4-D est dégradé sélectivement en 2,4-DCP, qui après formation de différents photoproduits peut être minéralisé complètement en H2O, Cl- et CO2. La formation de radicaux hydroxyles, obtenue sous irradiation des solutions de complexes Fe(III)-carboxylate a été confirmée par spectroscopie RPE. Ce travail montre que la présence de complexes Fe(III)-carboxylate peut avoir un impact considérable sur le devenir de polluants organiques présents dans les compartiments aquatiques naturels
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Floquet, Sébastien. « Conversion de spin thermo- et photo-induite de complexes ioniques de fe(iii) ». Paris 11, 2001. http://www.theses.fr/2001PA112211.

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Cette etude s'interesse aux conversions de spin thermo et photo-induite de complexes ioniques de fe(iii) et plus particulierement a l'influence de la nature du contre-ion sur les proprietes magnetiques de complexes anioniques et cationiques, celui-ci etant un cation ou un anion usuel, un complexe de charge opposee ou une matrice inorganique. De nouveaux complexes ferriques de thiosemicarbazone ont ete prepares et etudies. Une transition de spin discontinue avec une large hysteresis thermique centree autour de la temperature ambiante a ete caracterisee pour un complexe anionique. Cette propriete est couplee a une transition de phase cristallographique du premier ordre. Pour un complexe neutre de cette famille presentant une hysteresis de 3 k centree a 226 k, nous avons converti partiellement l'etat fondamental bs en un metastable hs par excitation lumineuse a 10 k. Dans cette meme famille, la fonctionalisation du ligand par un groupe styryl photo-isomerisable a permis la synthese de nouveaux complexes anioniques photo-sensibles. Leur irradiation en solution ou en matrice polymerique pmma permet l'isomerisation trans/cis du ligand lie au metal. Des mesures magnetiques realisees sur film mince du complexe mettent en evidence un changement de spin de l'ion metallique (effet ld-lisc). Une nouvelle famille de complexes ferriques cationiques du type fe i i i-catechol a ete egalement etudiee. Les caracteristiques de la transition de spin presentee par ces systemes ont ete modulee par le choix de differents substituants et contre-ions. Elles ont ete analysees a l'aide de donnees rx sur monocristal a temperature variable. Enfin, des complexes cationiques du type fe(r-sal 2trien) + ont ete intercales dans des phases lamellaires cdps 3 et mnps 3. Des equilibres de spin pour les complexes inseres ont ete caracterises. Un materiau d'intercalation dans mnps 3 presente a la fois la propriete de transition de spin du cation intercale et le ferrimagnetisme du reseau d'accueil a t < 36 k.
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Quirrenbach, Hanna Raquel. « Determinação das constantes de estabilidade, síntese e caracterização dos complexos de ácido fítico com os íons Fe(II) e Fe(III) ». UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2007. http://tede2.uepg.br/jspui/handle/prefix/696.

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The phytic acid depending on the pH value presents high potential quelante, quelanting metallic ions, inhibiting the production of species reactivates of oxygen, responsible for the destruction oxidative in biological systems. That potential quelante has been basing several applied studies to the antioxidant action in foods products, in environmental controls and as antioxidant in the human organism. The objective of this work was to study the degree of interaction of the phytic acid with the metallic ions Fe(II) and Fe(III), of biological importance, in near conditions of the physiologic and the stability of these complexes. Potentiometric titration were driven to determine the constants of formation of the complexes phytic acid-Fe(II) and phytic acid-Fe(III) in solution, under conditions of inert atmosphere, it ionic strength 0,1 mol.L-1 (KCl) at 36±0,1 ºC. For the system phytic acid- Fe(II), were determined seven constant of formation, corresponding to seven species formed in the range p[H] from 2,0 to 12,0. The first constant of formation of the complex phytic acid- Fe(II), it presented log K = 16,06 for the specie [MHL]9-, indicating that a great affinity exists among the ligand monoprotonated with the metal. For the system phytic acid-Fe(III) were determined seven constant of formation, seven species were detected in the range p[H] from 2,5 to 12,0. The first constant of formation of the complex presented log K = 18,87, very high value for the species [ML]9-, this denoted a strong interaction among the ligand deprotonated and the metallic ion. Studies spectroscopy in the region of the UV-Vis, were performed to accompany the formation of the complexes of the phytic acid with the metallic ions Fe(II) and Fe(III). In the studies of UV-Vis of the phytic acid in absence of the metallic ions, not occurred any absorption in the area of wavelength from 200 to 800 nm. Already for the ligand in the presence of the metallic ions two absorption bands were detected in 216 and 279 nm for the phytic acid-Fe(II) and 218 and 274 nm for the phytic acid Fe(III). Those are bands of transfer of electrons of the ligand for the metallic ion with formation of the linking coordinative. The complexes phytic acid-Fe(II) and phytic acid-Fe(III) were synthesized from the data potentiometric and characterized by absorption spectroscopy in the area of the infrared. The spectra for the system phytic acid in presence of the ions Fe(II), synthesized in pH=7,4, and Fe(III), pH=7,1, showed displacements in the areas of frequency of the groups O=PO3H2 of the phytic acid free. Those displacements, evidence that the ligant is coordinated to the metallic ions. Through the termogravimetry it verified that in the interval from 30 to 780 ºC the loss of total mass of the complex phytic acid-Fe(II) it was of 24,43 %. Of the room temperature up to 185 ºC, occurred the liberation of molecules of hydration water. In superior temperatures of this value the mass losses were relative to the decomposition of the compound, with liberation of constitution water and decomposition of the organic matter, with formation of double pyrophosphate of potassium and Fe(II) and potassium metaphosphate. The phytic acid-Fe(III) complexes presented thermal behavior similar to the complex phytic acid-Fe(II), however for the complex phytic acid-Fe(III) synthesized in pH 7,1 the loss of total mass of it was of 25,64 % in the area from 30 to 800 ºC, while the compound synthesized in pH 9,9 presented a loss of total mass of 31,98 % in the interval of temperature from 30 to 845 ºC. The obtained data, for the three complexes, indicate that the ligand is coordinated with the metallic ions so much in values of low pH as to you value of higher pH.
O ácido fítico dependendo do valor de pH apresenta alto potencial quelante, complexando íons metálicos, inibindo assim a produção de espécies reativas de oxigênio, responsáveis pela destruição oxidativa em sistemas biológicos. Esse potencial quelante tem fundamentado diversos estudos aplicados à ação antioxidante em produtos alimentícios, em controles ambientais e como antioxidante no organismo humano. O objetivo deste trabalho foi estudar o grau de interação do ácido fítico com os íons metálicos Fe(II) e Fe(III), de importância biológica, em condições próximas às fisiológicas e a estabilidade destes complexos. Titulações potenciométricas foram conduzidas para determinar as constantes de formação dos complexos ácido fítico-Fe(II) e ácido fítico-Fe(III) em solução, sob condições de atmosfera inerte, força iônica 0,100 mol.L-1 (KCl) a 36±0,1 ºC. Para o sistema ácido fítico- Fe(II), determinaram sete constantes de formação, correspondente a sete espécies formadas na faixa de p[H] de 2,0 a 12,0. A primeira constante de formação do complexo ácido fítico- Fe(II), apresentou log K=16,06 para a espécie [MHL]9-, indicando que existe uma grande afinidade entre o ligante monoprotonado com o metal. Para o sistema ácido fítico-Fe(III) foram determinadas sete constantes de formação, sete espécies foram detectadas na faixa de p[H] de 2,5 a 12,0. A primeira constante de formação do complexo apresentou log K=18,87, valor muito elevado para a espécie [ML]9-, isto denotou uma forte interação entre o ligante totalmente deprotonado e o íon Fe(III). Estudos espectroscópicos na região do UV-Vis foram realizados para acompanhar a formação dos complexos do ligante com os íons metálicos Fe(II) e Fe(III). Nos estudos de UV-Vis do ácido fítico em ausência dos íons metálicos não ocorreu nenhuma absorção na faixa de comprimento de onda de 200 a 800 nm. Já para o ligante na presença dos íons metálicos foram detectadas duas bandas de absorção em 216 e 279 nm para o ácido fítico-Fe(II) e 218 e 274 nm para o ácido fítico Fe(III). Essas são bandas de transferência de elétrons do ligante para o íon metálico com formação da ligação coordenativa. Os complexos ácido fítico-Fe(II) e ácido fítico-Fe(III) foram sintetizados a partir dos dados potenciométricos e caracterizados por espectroscopia de absorção na região do infravermelho. Os espectros para o sistema ácido fítico em presença do íon Fe(II), sintetizado em pH=7,4, e Fe(III), pH=7,1, mostraram deslocamentos nas regiões de freqüência dos grupamentos O=PO3H2 do ácido fítico livre. Esses deslocamentos evidenciam que o ligante encontra-se coordenado aos íons metálicos. Através da termogravimetria constatou-se que no intervalo de 30 a 780 ºC, a perda de massa total do complexo ácido fítico-Fe(II) foi de 24,43 %. Da temperatura ambiente até 185 ºC, ocorreu a liberação de moléculas de água de hidratação. Em temperaturas superiores deste valor as perdas de massa foram relativas à decomposição do complexo, com liberação de água de constituição e decomposição da matéria orgânica, com formação de pirofosfato duplo de potássio e Fe(II) e metafosfato de potássio. Os complexos ácido fítico-Fe(III) apresentaram comportamento térmico semelhante ao complexo ácido fítico-Fe(II), porém, para o complexo ácido fítico-Fe(III) sintetizado em pH 7,1 a perda de massa total do foi de 25,64 % na faixa de 30 a 800 ºC, enquanto que o complexo sintetizado em pH 9,9 apresentou uma perda de massa total de 31,98 % no intervalo de temperatura de 30 a 845 ºC. Os dados obtidos, para os três complexos, indicam que o ligante encontra-se coordenado com os íons metálicos tanto em valores de pH baixo como em valores de pH mais elevados.
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Nasri, Habib. « Synthese et caracterisation de porphyrines de fe(ii) et fe(iii) : modelisation du site actif du centre p460 present dans l'hydroxylamine oxydoreductase de la bacterie nitrosomonas europaea ». Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13149.

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Synthese de modeles du site actif du cytochrome p460 a l'etat reduit. Donc synthese et caracterisation d'une serie de complexes (fe(ii) (or)t piv pp)**(-) ou or=ome, oph, ophf::(4), oac; et des complexes fe(iii)cltpivpp, fe(iii)(oac)tpivpp, fe(iii)(so::(3)cf::(3))(h::(2)o)tpivpp
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Wang, Lei. « Photodégradation de pollutants organiques induite par des complexes Fe(III)-carboxylate en solutions aqueuses ». Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2008. http://tel.archives-ouvertes.fr/tel-00728829.

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La photodégradation de l'herbicide 2,4-D (acide 2,4-dichlorophénoxyacétique) et de son principal photoproduit (2,4-DCP) en présence de trois complexes Fe(III)-carboxylate (citrate, pyruvate, tartrate) a été étudiée. Les rendements quantiques de disparition du 2,4-D augmentent dans cet ordre : Fe(III)-TAr < Fe(III)-Cit < Fe(OH)2+ < Fe(III)-Pyr. Le même mécanisme de dégradation du 2,4-D est observé pour les trois complexes de fer et correspond à celui déjà décrit avec des processus généraux de radicaux hydroxyle. Le 2,4-D est dégradé sélectivement en 2,4-DCP, qui après formation de différents photoproduits peut être minéralisé complètement en H2O, Cl- et CO2. La formation de radicaux hydroxyles, obtenue sous irradiation des solutions de complexes Fe(III)-carboxylate a été confirmée par spectroscopie RPE. Ce travail montre que la présence de complexes Fe(III)-carboxylate peut avoir un impact considérable sur le devenir de polluants organiques présents dans les compartiments aquatiques naturels.
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Livres sur le sujet "Complexes de Fe(III)"

1

Khan, Tasneem A. Chemistry of organogold (I) & (III) complexes. Manchester : UMIST, 1997.

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W, Buchler J., dir. Metal complexes with Tetrapyrrole Ligands III. Berlin : Springer, 1995.

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Harris, J. Robin, et Jon Marles-Wright, dir. Macromolecular Protein Complexes III : Structure and Function. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-58971-4.

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Cañadillas-Delgado, Laura. Magnetic interactions in oxo-carboxylate bridged gadolinium (III) complexes. Hauppauge, N.Y : Nova Science Publishers, 2010.

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Wright, J. P. The synthesis of organogold(III) complexes with potential medicinal interest. Manchester : UMIST, 1995.

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Zemnuhova, L., R. Davidovich, A. Udovenko, A. Panasenko, E. Kovaleva, N. Makarenko, G. Fedorischeva et V. Logvinova. FLUORIDE COMPLEXES OF ANTIMONY(III). SYNTHESIS, STRUCTURE, PROPERTIES, AND APPLICATION. ru : Publishing Center RIOR, 2023. http://dx.doi.org/10.29039/978-5-6050261-1-2.

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In the monograph the synthesized and studied at the Institute of Chemistry, FEB RAS, and described in the literature fluoride and complex fluoride compounds, including multiligand fluoroacidocomplex antimony(III) compounds obtained from aqueous hydrofluoric acid solution, their crystal structures, properties and applications are analyzed, discussed and systematized. The monograph consists of an introduction, 5 chapters, and a conclusion. The regularities of the synthesis of complex compounds based on antimony(III) fluoride are described in chapter 1. The crystal structures of fluoride and halogen containing antimony(III) complex compounds and their comparative analysis are presented in chapter 2. The results of NQR-spectroscopic investigations and conclusions about the main regularities of 121,123Sb NQR parameter changes are presented in chapters 3 and 4. Ecotoxicological properties of fluoride and complex fluoride compounds of antimony(III) are considered in Chapter 5. The present monograph can be interest for crystallography researchers and chemists working in the field of metal fluoride complexes as well as for Ph.D. and graduate students.
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1978-, O'Shea Brian W., Heger Alexander et Abel Tom G. 1970-, dir. First stars III : Santa Fe, New Mexico, 15-20 July 2007. Melville, N.Y : American Institute of Physics, 2008.

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Barrow, Maureen. Chemistry of some organometallic complexes derived from Iron bis-Triphenylphosphite Tricarbonyl, Fe{P(OPh } (CO). Dublin : University College Dublin, 1998.

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Klüglein, Nicole. Bacterial Fe(III) reduction and Fe(II) oxidation : Relevance for magnetite formation in the environment and the mechanism of nitrate-dependent Fe(II) oxidation. [S.l : s.n.], 2014.

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El-Naby, Sultan Ahmed Abd. A study of the reactions of nucleophiles with [(Indenyl)Fe(CO)2([eta]1-dppa)]BF4 a=m,e,p. Dublin : University College Dublin, 1997.

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Chapitres de livres sur le sujet "Complexes de Fe(III)"

1

Plyusnin, Victor, Ivan Pozdnyakov, Eugeny Glebov, Vjacheslav Grivin et Nikolai Bazhin. « Intermediates in Photochemistry of Fe(III) Complexes in Water ». Dans The Role of Ecological Chemistry in Pollution Research and Sustainable Development, 65–76. Dordrecht : Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2903-4_7.

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Ye, Zhonghui, Qing Lin, Yun He, Min Liu et Yanfang Xia. « Magnetic Studies in Complexes Derived from the Reaction of Fe(III) Salen Base Complexes and Hexacyanoferrate ». Dans Lecture Notes in Electrical Engineering, 807–14. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4847-0_99.

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Bratu, I., V. Chis, L. David, O. Cozar, GH Bora, P. Legrand et J. P. Huvenne. « IR and EPR Studies of Some Fe(III)-Complexes With Antiinflammatory Drugs ». Dans Spectroscopy of Biological Molecules, 557–58. Dordrecht : Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0371-8_257.

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Hockertz, Joachim M., Steen Steenken, Claudia Stockheim et Karl Wieghardt. « Radicals in Aqueous Solution from Fe(III) Complexes with Macrocyclic Ligands Containing Phenolates ». Dans Free Radicals in Biology and Environment, 133–44. Dordrecht : Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-017-1607-9_10.

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Benkelberg, H. J., U. Deister et P. Warneck. « OH Quantum Yields for the Photodecomposition of FE(III) Hydroxo Complexes in Aqueous Solution and the Reaction of OH with Hydroxymethanesulfonate ». Dans Physico-Chemical Behaviour of Atmospheric Pollutants, 263–69. Dordrecht : Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0567-2_41.

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Klein, M., et F. Renz. « Chemical tuning of high-spin complexes based on 3- and 4-hydroxy-pentadentate-Fe (III) complex-units investigated by Mössbauer spectroscopy ». Dans ICAME 2005, 1001–7. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-49853-7_49.

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Renz, F., P. Kerep, D. Hill et M. Klein. « Complexes based on ethylene- and propylene-bridged-pentadentate-Fe(III)-units allow interplay between magnetic centers and multistability investigated by Mössbauer spectroscopy ». Dans ICAME 2005, 981–87. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-49853-7_46.

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Sorenson, John J. R., Lee S. F. Soderberg, Max L. Baker, John B. Barnett, Louis W. Chang, Hamid Salari et William M. Willngham. « Radiation Recovery Agents : Cu(II), Mn(II), Zn(II), OR Fe(III) 3,5-Diisopropylsalicylate Complexes Facilitate Recovery from Ionizing Radiation Induced Radical Mediated Tissue Damage ». Dans Advances in Experimental Medicine and Biology, 69–77. Boston, MA : Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5730-8_10.

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Nakazawa, Hiroshi, et Masumi Itazaki. « Fe–H Complexes in Catalysis ». Dans Iron Catalysis, 27–81. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14670-1_2.

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Schmidtke, Hans-Herbert, C. W. Bradford et M. J. Cleare. « Pentaammineiridium(III) Complexes ». Dans Inorganic Syntheses, 243–47. Hoboken, NJ, USA : John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132432.ch42.

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Actes de conférences sur le sujet "Complexes de Fe(III)"

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Shukla, Kritika, Ashutosh Mishra et Pradeep Sharma. « Synthesis, characterization, XRD and EXAFS studies of Fe(III) complexes ». Dans PROF. DINESH VARSHNEY MEMORIAL NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS : NCPCM 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5098717.

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Zhou, Danna, Jie Wang, Liwei Hou, Jing Xu et Yan Zhao. « Photochemistry of Fe(III)-Tetracycline Complexes in Aqueous Solution under UV Irradiation ». Dans 2012 Third International Conference on Digital Manufacturing and Automation (ICDMA). IEEE, 2012. http://dx.doi.org/10.1109/icdma.2012.144.

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Prajapat, Garima, Uma Rathore, Rama Gupta et N. Bhojak. « Thermal and biological evolution of Fe(III)-Sulfanilamide complexes synthesized by green strategy ». Dans 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032831.

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Vidya, G. V., S. S. Meena, Pramod Bhatt, V. Sadasivan et S. Mini. « Spectroscopic studies on Fe(II) and Fe(III) complexes of 5-aryl azo substituted lH-pyrimidine-2,4-dione ». Dans PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE : RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810574.

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Ermolaeva, A. A., O. M. Lavrova et E. V. Tovkaleva. « Study of the prediction of biological activity and toxicity of Fe (III) complexes with organic ligands ». Dans ACTUAL PROBLEMS OF ORGANIC CHEMISTRY AND BIOTECHNOLOGY (OCBT2020) : Proceedings of the International Scientific Conference. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0070194.

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Ridhorkar, B. D., A. A. Ramteke, Y. K. Vyawahare et A. R. Yaul. « Synthesis, characterization and biological screening of Ti(III), Cr(III), Fe(III) and UO2(VI) mononuclear complexes of hydrazone Schiff base ligand containing NON moiety ». Dans NATIONAL CONFERENCE ON PHYSICS AND CHEMISTRY OF MATERIALS : NCPCM2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0061306.

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Prananto, Yuniar P., Ade H. Rafika, Sasti G. Fadhilah, Muhammad M. Khunur et Rachmat T. Tjahjanto. « Effect of type of Fe(III) salts and reaction temperature in the synthesis of Fe(III)-Mn(II)-Tartrate heteronuclear complex ». Dans CHEMISTRY BEYOND BORDERS : INTERNATIONAL CONFERENCE ON PHYSICAL CHEMISTRY : The 1st Annual Meeting of the Physical Chemistry Division of the Indonesian Chemical Society. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0174980.

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Sow, Ibrahima Sory, Michel Gelbcke, Franck Meyer, Dong Yang, Koen Robeyns, Véronique Fontaine et François Dufrasne. « Synthesis and antibacterial, antimycobacterial and antifungal activities of the complexes of Fe(II), Fe(III), Cu(II), Zn(II) and Ni(II) of aliphatic hydroxamic acids ». Dans 6th International Electronic Conference on Medicinal Chemistry. Basel, Switzerland : MDPI, 2020. http://dx.doi.org/10.3390/ecmc2020-07384.

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« Synthesis, characterization and biological properties of new Codeine Fe(III) complex ». Dans International Conference on Medicine, Public Health and Biological Sciences. CASRP Publishing Company, Ltd. Uk, 2016. http://dx.doi.org/10.18869/mphbs.2016.65.

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LUCCA, B. A. D., C. A. L. GRAÇA et A. C. S. C. TEIXEIRA. « DEGRADAÇÃO DE ENROFLOXACINA PELO PROCESSO FOTO-FENTON-LIKE UTILIZANDO COMPLEXO DE Fe(III)-TARTARATO COMO FONTE DE Fe (II) ». Dans XXII Congresso Brasileiro de Engenharia Química. São Paulo : Editora Blucher, 2018. http://dx.doi.org/10.5151/cobeq2018-pt.0075.

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Rapports d'organisations sur le sujet "Complexes de Fe(III)"

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Shen, Wen-Tang. A polarographic study of Fe(II) and Fe(III) complexes with catechol. Portland State University Library, janvier 2000. http://dx.doi.org/10.15760/etd.2795.

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Nieland et Ying. L52105 Improvement in Performance in the Mark III Elastic Wave. Chantilly, Virginia : Pipeline Research Council International, Inc. (PRCI), décembre 2003. http://dx.doi.org/10.55274/r0011087.

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The Elastic Wave (EW) technology has a proven record of detecting longitudinal cracking in gas and liquid pipelines. However, the historical dig success rate for this inspection tool is only 1 in 4; i.e. for every four excavations carried out by pipeline operators, following an EW inspection, typically a crack or crack field will only be found at one of those excavations. This project set out to: Understand the ultrasonic data available to the inspection tool, establish whether there is information in the raw signal to differentiate between cracks and non-cracks, develop potential crack discrimination techniques, and determine how the on-board electronics and off-board software should be changed to capture this ultrasonic data and enable more reliable defect classification leading to a significantly improved dig success rate. The project has been completed. A validated FE ultrasonic simulation model was produced. An automatic defect classification technique has been developed, which exploits differences in the frequency responses from crack and lamination signals. Experimental results show that 97% of defects can be classified correctly with this technique. A suitable on-board data compression technique was identified and a feasibility study showed that it could be implemented by modifying the EW tool and analysis software.
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Kemner, K. M., S. D. Kelly, Bill Burgos et Eric Roden. Reaction-based reactive transport modeling of Fe(III). Office of Scientific and Technical Information (OSTI), juin 2006. http://dx.doi.org/10.2172/896240.

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Alexandar, Irina, Nikolay Kaloyanov, Veneta Parvanova, Christian Girginov et Alexander Zahariev. Antimicrobial Activity of Bi(III) Complexes with Some Sulphonic Acids. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, août 2021. http://dx.doi.org/10.7546/crabs.2021.08.06.

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Neal, Andrew. Molecular Mechanism of Bacterial Attachment to Fe(III)-Oxide Surfaces. Office of Scientific and Technical Information (OSTI), juin 2006. http://dx.doi.org/10.2172/896798.

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Maurice, P. Dissolution of Fe(III)(hydr)oxides by an Aerobic Bacterium. Office of Scientific and Technical Information (OSTI), décembre 2004. http://dx.doi.org/10.2172/837302.

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Roden, Eric E., et Matilde M. Urrutia. Advanced Experiment Analysis of controls on Microbial FE(III) Oxide Reduction. Office of Scientific and Technical Information (OSTI), juin 1999. http://dx.doi.org/10.2172/828053.

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Kelley, D. Kinetics and mechanisms of the reactions of alkyl radicals with oxygen and with complexes of Co(III), Ru(III), and Ni(III). Office of Scientific and Technical Information (OSTI), octobre 1990. http://dx.doi.org/10.2172/6454295.

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Burgos, William D., Eric E. Roden et Gour-Tsyh Yeh. Reaction-Based Reactive Transport Modeling of Fe(III) and U(V) Reduction. Office of Scientific and Technical Information (OSTI), juin 2005. http://dx.doi.org/10.2172/893413.

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Lovley, Derek R. Mechanisms for Electron Transfer Through Pili to Fe(III) Oxide in Geobacter. Office of Scientific and Technical Information (OSTI), mars 2015. http://dx.doi.org/10.2172/1172030.

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