Relevant bibliographies by topics / Fe2+ complexes

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Academic literature on the topic 'Fe2+ complexes'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Fe2+ complexes"

1

De, Rajib Lai, and Heinrich Vahrenkamp. "Synthesen neuer Fe–P-Käfigverbindungen / Syntheses of New Fe–P Cage Compounds." Zeitschrift für Naturforschung B 41, no. 3 (March 1, 1986): 273–82. http://dx.doi.org/10.1515/znb-1986-0302.

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Four reaction types were used with the aim of obtaining new cage compounds of composition Fex(CO)y(PR)z- with R = Me, Ph, Tol: oxidation of the compounds Fe2(CO)6(PHR)2, photolysis thereof, reaction between RPCF and Fe2(CO)82- . and reaction between P-Cl containing iron complexes and Fe(CO)42_. Besides several known products, e.g. Fe3(CO)9(PR)2 or Fe4(CO)11(PR)2, and derivatives of the Fe2(CO)6(PRX)2 butterfly type complexes, the new octabisvalene shaped compounds Fe4(CO)2(PR)4 with R = Me, Ph, Tol were obtained and confirmed by a crystal structure analysis for R = Me, Side products of the oxidative conversions were Fe4(CO)12(P2Me2)(MeP-C2H4-PMe) and Fe4(CO)12(P2Tol2)(PHTol)2 which can be derived from the octabisvalene type. Side products of the irradiative conversions were Fe3(CO)8(PPh)(PHPh)2 and (CO)3Fe(μ-PHPh)2Fe(CO)(C6H8). the structure of the latter being proved crystallographically.
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Hasinoff, Brian B. "Oxyradical production results from the Fe3+–doxorubicin complex undergoing self-reduction by its α-ketol group." Biochemistry and Cell Biology 68, no. 12 (December 1, 1990): 1331–36. http://dx.doi.org/10.1139/o90-195.

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A variety of different measures have been used to compare the self-reduction of the Fe3+ complexes of doxorubicin and daunorubicin. The Fe3+ –doxorubicin complex exhibited a much faster rate of (i) O2 consumption, (ii) self-reduction under Ar to the Fe2+ complex, (iii) aerobic reduction of ferricytochrome c, (iv) scavenging of Fe2+ by bipyridine, (v) hydroxyl radical production measured by electron paramagnetic resonance spin-trapping experiments, and (vi) inactivation of the cytochrome c oxidase activity of beef heart submitochondrial particles, than did the corresponding Fe3+ –daunorubicin complex. In contrast to Fe3+ –doxorubicin, the Fe3+ –daunorubicin complex displayed only a fast phase of inhibition of the cytochrome c oxidase activity, indicating that the initial binding of these two Fe3+ –drug complexes is very similar. All of these results indicate that Fe3+ –doxorubicin undergoes a much faster self-reduction to the Fe2+ complex and hence a much greater rate of production of damaging oxyradicals when the Fe2+ is reoxidized by O2 or H2O2. The addition of the α-ketol acetol to Fe3+–daunorubicin resulted in greately increased rates of (i) ferricytochrome c reduction, (ii) Fe2+ production, and (iii) hydroxyl radical production. These results support the hypothesis that the α-ketol functional group of doxorubicin (which is not present on daunorubicin and is the only structural difference between these two compounds) reduces the Fe3+ while undergoing oxidation itself.Key words: doxorubicin, adriamycin, iron, self-reduction, oxyradical.
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Herberhold, Max, Wolfgang Feger, and Ulf Thewalt. "Umsetzungen von Ferrocenyl-lithium mit Carbonyleisen-Komplexen / Reactions of Ferrocenyl Lithium with Carbonyliron Complexes." Zeitschrift für Naturforschung B 45, no. 4 (April 1, 1990): 447–56. http://dx.doi.org/10.1515/znb-1990-0407.

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The reaction of cis-Fe(CO)4Br, with ferrocenyl lithium, FcLi, leads to the binucleara hexacarbonyldiiron complexes Fe2,(CO)6(μ-Br)(μ-CFc) (7), Fe,(CO)6(μ-COFc)2 (8) and Fe2(CO)6(μ-C2Fc2O) (9)b. Addition of FcLi to Fe(CO)5 gives the ferrocenoyl tetracarbonylferrate anion which was characterized as the salt NEt4+[Fe(CO)4(FcCO)]- (10); 9 is obtained after reaction of the anion with Meerwein’s salt, Me3O+BF4-.The reaction of Fe2(CO)9 with FcLi, followed by methylation with Me3O+BF4-, results in the formation of Fe2(CO)8[μ2-C(OMe)Fc] (11) which can be extracted from the product mixture using pentane. Chromatography of the product mixture over silica, however, leads preferentially to the formation of trinucleara complexes of the type Fe3(CO)9(μ3-COMe)(μ3-CR) (R = Fc (12), OMe (13) and O(CH2)4OMe (14)) in addition to 9; the same products are obtained starting from Fe3(CO)12. No complexes could be isolated which contained a direct iron σ-ferrocenyl bond. The structures of the new complexes were deduced from their infrared, mass, 1H and 13C NMR spectra. The bis(ferrocenoyl)-bridged compound 8 was also characterized by an X-ray crystallographic structure analysis.
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Maxton, D. G., R. P. H. Thompson, and R. C. Hider. "Absorption of iron from ferric hydroxypyranone complexes." British Journal of Nutrition 71, no. 2 (February 1994): 203–7. http://dx.doi.org/10.1079/bjn19940127.

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The absorption of 59Fe from preparations of FeSO4 and the ferric hydroxypyranone complexes maltol and ethyl maltol was studied by whole-body counting in normal subjects and patients with Fe deficiency. Fe in the Fe3+ complexes was in general absorbed almost as well as Fe2+. It is concluded that the absorption of Fe3+ from hydroxypyranone complexes is much greater than that from simple Fe3+ salts; this may prove an efficient and less toxic form of Fe for the treatment of deficiency.
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Hamdan, lmad I., and Motasem Taha. "Spectrophotometric and Conductometric Study of the Complexation of Ranitidine to Fez+, Fe3+, Al*, Mg*+, Cu", Ni2+ and PtP+ Metal Ions: Pharmaceutical Implications." Scientia Pharmaceutica 68, no. 4 (October 12, 2000): 357–67. http://dx.doi.org/10.3797/scipharm.aut-00-33.

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Complexation properties of ranitidine (Ran) with Fe2+, Fe3+, A13+, Mg2+, Cu2+, Ni2+ and Pb2+ were studied using UV/V|S spectroscopy and conductometric titrations respectively. Ranitidine was found to form 1:1 complexes in methanol or aqueous buffer (pH 6.5) with all cations except magnesium. In case of Fe3+ complexes of the formula [(Fe3+)2Ran] were evident.
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Lindenberger, Heide, Reiner Birk, Olli Orama, Gottfried Huttner, and Heinz Berke. "Ketenylidentriphenylphosphoran-Komplexe / Ketenylidenetriphenylphosphorane Complexes." Zeitschrift für Naturforschung B 43, no. 6 (June 1, 1988): 749–57. http://dx.doi.org/10.1515/znb-1988-0619.

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AbstractKetenylidenetriphenylphosphorane complexes of the type LnMC(CO)PPh3 LnM = CpMn(CO)2 (2a), CpRe(CO)2 (2b) and Fe(CO)4 (3) are obtained by CO substitution reactions. The synthesis of 3 at 80 °C is accompanied by the formation of a Fe2(CO)6 compound with a bridging α-metallated formyl(triphenylphosphane)carbido ligand. From ethylation of 3 arises an Fe2(CO)6 ferrol-type complex 5.
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Hassan, Kamaledin. "Characterization of granites by 57Fe Mössbauer spectroscopy." Mineralogia 40, no. 1-4 (January 1, 2009): 95–106. http://dx.doi.org/10.2478/v10002-009-0008-x.

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Characterization of granites by 57Fe Mössbauer spectroscopyTwo granite complexes in Egypt, a sodic type and an aluminous type are characterized by Mössbauer spectroscopy. Mössbauer spectra (MS) of the sodic granite show a major doublet of ferric (Fe3+) iron that is attributable to octahedral coordination (M1) sites plus/minus a tetrahedron Fe3+ doublet plus/minus a doublet of ferrous (Fe2+) iron on the M1 sites plus/ minus another Fe2+ (M1) doublet and a sextet of Fe3+. The sextet is attributed to α-Fe2O3 (hematite) and the other Fe components are due to NaCaFeSi2O6 (aegirine-augite) plus/minus minor contributions from (Ca2(Mg, Fe)5(Si, Al)8O22(OH)2 (magnesium-hornblende). Changes in the quadrupole splitting and width line of Fe2+ ions are likely composition-related. The MS of the aluminous-type granite, on the other hand, shows evidence only of single doublets containing Fe2+ or Fe3+ in the octahedral M1 sites, with parameters that remain almost constant. This consistency implies that the existing minerals - K(Mg, Fe2+)3 (Al, Fe3+)Si3O10(OH, F)2 (biotite), (Mg, Fe)6(Si, Al)4O10(OH)8 (clinochlore), (Na, K)Ca2(Fe, Mg)5(Al, Si)8O22(OH)2 (ferrohornblende and magnesiohornblende) - have similar iron positions. The intensity of iron oxidized (Fe3+/ΣFe) for the sodic granite is 79.1 to 100% and for the aluminous granite, 28.4 to 38.2%. The observed Fe3+/ΣFe differences between the two granites are source-related and consistent with distributions of other redox-sensitive elements.
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De Grave, E., J. Vandenbruwaene, and E. Elewaut. "An 57Fe Mossbauer effect study on glauconites from different locations in Belgium and Northern France." Clay Minerals 20, no. 2 (June 1985): 171–79. http://dx.doi.org/10.1180/claymin.1985.020.2.02.

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AbstractSixteen glauconite samples from different locations in Belgium and Northern France were investigated by 57Fe Mössbauer spectroscopy at room temperature. The spectra were fitted with three Fe3+ and two Fe2+ doublets, both Fe species occupying M1(trans) and M2(cis) sites in the T-O-T layers. The third Fe3+ doublet was assigned to interlayer ferric complexes. The observed Mössbauer parameters did not show significant variations from sample to sample. No direct relation between K and Fe content was observed, although within some distinct groups (e.g. Bande Noire, Cenomanian) the amount of Fe2+ increased with increasing K content.
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Kneifel, Charles L., Harold L. Friedman, and Marshall D. Newton. "Calculation of the Thermodynamic Solvent Isotope Effect for Ferrousand FerricIons in Water." Zeitschrift für Naturforschung A 44, no. 5 (May 1, 1989): 385–94. http://dx.doi.org/10.1515/zna-1989-0506.

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Molecular dynamics simulations of molecular models of Fe2+ and Fe3+ in water (L2O = H2O or D2O) are used to generate various correlation functions that characterize the respective hexaaquo hydration complexes. The static Fe2+-oxygen and Fe2+-hydrogen correlation functions are compared in detail with the first difference neutron diffraction results of Enderby et al. for Ni2+ . Velocity autocorrelation functions and corresponding power spectra are generated and analyzed for those modes of hydration shell water molecules whose reduced masses are most sensitive to the changes from H2O to D2O. Various approximations are applied to these data to calculate the solvent isotope effect on the difference in hydration free energies for Fe2+ and Fe3+ . These different approximations all lead to the qualitative conclusion that the net solvent isotope effect reflects a large degree of cancellation between the OL stretching modes and the librational modes. The simulation results generally agree with the results of earlier quantum chemical calculations applied to the same system, but in some respects the new results are not as realistic as the earlier ones. It is proposed that the agreement with experiment would be improved by changes in the model potential which are motivated by other, independent considerations.
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Shoukry, Mohamed, and Safaa Hassan. "Thermodynamic investigation of the binary and ternary complexes involving 1-aminocyclopropane carboxylic acid with reference to plant hormone." Open Chemistry 12, no. 3 (March 1, 2014): 318–24. http://dx.doi.org/10.2478/s11532-013-0374-5.

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AbstractComplex formation equilibria of 1-aminocyclopropane carboxylic acid (ACC) and 3,3-bis(1-methylimidazol-2-yl) propionic acid (BIMP) with metal ions Cu2+, Ni2+, Co2+, Zn2+, Mn2+ and Fe2+ were investigated. ACC forms 1:1 and 1:2 complexes in addition to the hydrolysed form of the 1:1 complex, except in the case of Mn2+ and Fe2+, where the hydrolysed complex is not formed. BIMP forms 1:1 and 1:2 complexes in addition to the hydrolsed form of the 1:1 complex in the case of Mn2+ and Cu2+, however the hydrolysed complex is not detected for Ni2+, Co2+, Zn2+ and Fe2+. The concentration distribution diagrams of the complexes were determined. The Fe2+-complex with BIMP is exothermic and the thermodynamic parameters were calculated. The effect of organic solvent on the acid dissociation constants of 1-aminocyclopropane carboxylic acid (ACC) and 3,3-bis(1-methylimidazol-2-yl) propionic acid (BIMP) and the formation constants of Fe2+ complexes were investigated. Fe2+ forms a mixed-ligand complex with ACC and BIMP with stoichiometric coefficients 1:1:1. The formation constant was determined. The ternary complex is enhanced by back donation from the negatively charged 1-aminocyclopropane carboxylate to the π-system of BIMP. From the concentration distribution diagram, the ternary complex prevails in the physiological pH range.
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Dissertations / Theses on the topic "Fe2+ complexes"

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Ducouret-Cérèze, Annie. "Etude Mössbauer de l'ion Fe2+ dans les structures quadratiques K2FeF4 et Ba2FeF6, interprétée dans un modèle vibronique de complexe moléculaire." Le Mans, 1987. http://www.theses.fr/1987LEMA1032.

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L'étude des propriétés électroniques, magnétiques et vibroniques de l'ion Fe2+ (haut spin) dans les fluorures quadratiques K2FeF4 et Ba2FeF6 et les composés diamagnétiques isotypes contenant du zinc fait l'objet du mémoire. Les résultats de Spectrométrie Mössbauer dont certains sont obtenus sous champ magnétique, complétés par ceux de diffraction de neutrons, ont été analysés d'abord dans un modèle de champ cristallin statique qui permet d'expliquer qualitativement le comportement antiferromagnétique, plan facile de K2FeF4 et axe facile de Ba2FeF6. Mais pour rendre compte correctement des courbes de variation thermique de la séparation quadripolaire SQ(T) des deux composés il faut introduire le couplage avec les vibrations du réseau. Un modèle d'hamiltonien vibronique qui diagonalise les termes de champ cristallin statique, le couplage spin-orbite, le couplage Jahn-Teller dynamique linéaire avec deux modes actifs B1g et B2g de vibration du complexe moléculaire FeF6, a fourni un ajustement très satisfaisant de SQ pour les deux fluorures. Les fréquences des modes, les constantes de couplage, les paramètres de champ statique et les paramètres hyperfins obtenus pour les deux composés sont compatibles avec les données de dynamiques de réseau.
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Petzold, Holm, Paul Djomgoue, Gerald Hörner, J. Matthäus Speck, Tobias Rüffer, and Dieter Schaarschmidt. "1H NMR spectroscopic elucidation in solution of the kinetics and thermodynamics of spin crossover for an exceptionally robust Fe2+ complex." Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-210226.

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A series of Fe2+ spin crossover (SCO) complexes [Fe(5/6)]2+ employing hexadentate ligands (5/6) with cis/trans-1,2-diamino cyclohexanes (4) as central building blocks were synthesised. The ligands were obtained by reductive amination of 4 with 2,2′-bipyridyl-6-carbaldehyde or 1,10-phenanthroline-2-carbaldehyde 3. The chelating effect and the rigid structure of the ligands 5/6 lead to exceptionally robust Fe2+ and Zn2+ complexes conserving their structure even in coordinating solvents like dmso at high temperatures. Their solution behavior was investigated using variable temperature (VT) 1H NMR spectroscopy and VT Vis spectroscopy. SCO behavior was found for all Fe2+ complexes in this series centred around and far above room temperature. For the first time we have demonstrated that the thermodynamics as well as kinetics for SCO can be deduced by using VT 1H NMR spectroscopy. An alternative scheme using a linear correction term C1 to model chemical shifts for Fe2+ SCO complexes is presented. The rate constant for the SCO of [Fe(rac-trans-5)]2+ obtained by VT 1H NMR was validated by Laser Flash Photolysis (LFP), with excellent agreement (1/(kHL + kLH) = 33.7/35.8 ns for NMR/LFP). The solvent dependence of the transition temperature T1/2 and the solvatochromism of complex [Fe(rac-trans-5)]2+ were ascribed to hydrogen bond formation of the secondary amine to the solvent. Enantiomerically pure complexes can be prepared starting with R,R- or S,S-1,2-diaminocyclohexane (R,R-trans-4 or S,S-trans-4). The high robustness of the complexes reduces a possible ligand scrambling and allows preparation of quasiracemic crystals of [Zn(R,R-5)][Fe(S,S-5)](ClO4)4·(CH3CN) composed of a 1 : 1 mixture of the Zn and Fe complexes with inverse chirality
Dieser Beitrag ist aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich
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Tahiri, Mohamed. "Phtalocyanines de fer(i) et de fer(0) : synthese, structure et reactivite." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13043.

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Synthese et caracterisation d'une serie de complexes monoreduits de phtalocyanine de fer de type (fe pc r::(8))**(-) ou r=och::(3), ch::(3), h, cl et cn. On donne les structures par rx de composes monoanioniques et dianionique fe pc**(-) et fe pc**(2-). Proprietes chimiques de fe pc**(2-). De tels especes peuvent etre des modeles d'intermediaires formes dans la reaction de la phenylhydrazine sur la metmyoglobine ou dans le metabolisme de substrats suicides par cytochrome p450
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Gourdon, André. "Synthèse et étude structurale de clusters de fer contenant un hétéroatome du type carbure, nitrure, phosphure." Paris 6, 1986. http://www.theses.fr/1986PA066404.

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Nuel, Didier. "Etude de la reactivite de fragments alkylidynes dans des clusters trinucleaires du fer." Toulouse 3, 1986. http://www.theses.fr/1986TOU30206.

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Reactivite des complexes fe::(3)(co)::(9)(cch::(3))(coc::(2)h::(5)) ou fe::(3)(co)::(10)(cch::(3))(h). Les reactions de couplage des groupes alkylidynes avec les algues sont faciles. L'action de co a mis en evidence le couplage reversible dans des conditions douces de 2 fragments alkylidynes. En general, la presence du coordinat hydruro rend les reactions plus complexes
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Navarre, Didier. "Carbonylation des complexes μ-alkylideniques." Paris 6, 1986. http://www.theses.fr/1986PA066101.

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Synthèse et carbonylation des complexes μ-alkylidene, en particulier fe-μ-méthylène. Mise en évidence de la réaction de dicarboxylation correspondant à l'insertion d'une molécule de Co dans chaque liaison du C en pont. Le premier intermédiaire est un complexe acyl.
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Chabut, Barbara. "Complexes binucléaires à fer non-heminique : activité biomimétique et échange de ligands." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10234.

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Notre travail s'inscrit dans le cadre de la recherche de complexes modeles de sites actifs binucleaires d'enzymes a fer non heminique et plus particulierement de l'hemerythrine et de la methane monooxygenase. Pour cela, nous avons synthetise des composes dans lesquels le centre binucleaire est dissymetrique, c'est a dire que les deux ions metalliques sont dans des environnements differents. Ainsi lors de la synthese de complexes a valence mixte, fe#i#i#ife#i#i, l'ion ferrique est dans un environnement n#3o#3 alors que l'ion ferreux se trouve dans un environnement n#2o#3x, un ligand exogene completant sa sphere de coordination. Notre projet s'articule ensuite principalement autour de deux axes : - l'etude de la structure electronique du centre a fer suivant les conditions de solvatation et d'hydratation du milieu, donc suivant la nature du ligand x. On montre par ces experiences que les proprietes spectroscopiques et electrochimiques des complexes varient suivant si x est une molecule d'acetonitrile ou une molecule d'eau et, de plus, lors de l'oxydation de la forme fe#i#i#ife#i#i-oh#2 il se produit une deprotonation spontanee pour conduire a une espece fe#i#i#ife#i#i#i-oh. - la capacite des complexes a catalyser des reactions d'hydroxylation de substrats, en presence de donneurs d'oxygene. Les resultats obtenus indiquent que les complexes possedent une activite monooxygenase et, de plus, en presence de toluene, il se produit une hydroxylation en position ortho pour donner comme produit d'oxydation l'ortho-cresol, ce qui modelise la reactivite de la toluene-2-monooxygenase. Enfin, dans une derniere partie, nous presentons la structure d'un nouveau complexe possedant une entite fe#i#i#i#2(-oh)#2.
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Marty-Tommasi, Laurence. "Modélisation du centre actif de métalloprotéines à fer non hème. Complexes du fer avec des analogues de PQQ et des ligands à donneurs soufre et N-imidazole." Toulouse 3, 1995. http://www.theses.fr/1995TOU30022.

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La premiere partie de ce travail concerne la synthese et l'etude des proprietes de quatre complexes du fer. Ils sont constitues d'analogues de synthese du pqq (pyrroloquinoleine quinone), dont deux sont sous forme reduite et un sous forme orthoquinonique. Les etudes par spectroscopie infrarouge, mossbauer et susceptibilite magnetique des quatre complexes, ont mis en evidence differentes nuclearites dependant de la stoechiometrie fe/l et du ph de la reaction. Trois sont caracterises par un rapport fe/2l (deux mononucleaires et un polynucleaire). Le quatrieme complexe dont la determination de la structure moleculaire a permis de mettre en evidence la forme dimere et le mode de coordination monodente pontant du carboxylate, est caracterise par un rapport fe/l. Le site de chelation privilegie des analogues de la forme reduite du pqq est constitue par l'azote pyridinique, la fonction acide adjacente a cet azote et l'oxygene methoxy ou hydroxy. Par contre le site de chelation privilegie de l'analogue de la forme oxydee fait intervenir les oxygenes quinoniques. La deuxieme partie de notre travail concerne la modelisation du centre actif des nitriles hydratases. Nous avons realise la synthese de quatre ligands bidentes renfermant simultanement des donneurs soufres et azotes. A partir de ces ligands, nous avons synthetise huit complexes du fer(ii) et etudie leurs proprietes spectrales (infrarouge, mossbauer) et magnetiques. Trois des quatre ligands conduisent a quatre complexes de stoechiometrie 2l/fe alors que le ligand 1h-benzimidazole-2-ethanethiol donne des complexes de stoechiometrie 3l/2fe: fe#i#i#2(lh)#3, x, ymeoh avec x = acetate, perchlorate ou chlorure, y = 1 ou 1,5. Le complexe fe#i#i(lh)#2, h#2o qui renferme deux ligands benzenethiol,2-(1h-benzimidazole-2-yl), lh#2 possede des caracteristiques (environnement de ligands de type n#2os#2) compatibles avec la modelisation du site actif des nitrile hydratases
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Etienne, Michel. "Réactivité de complexes dinucléaires hydrure et alcénylidène ponte du fer vis-a-vis d'hydrocarbures cyanes insatures (mono et dicyanoacétylène, tétracyanoethylène)." Brest, 1988. http://www.theses.fr/1988BRES2009.

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Preparation de complexes avec des coordinats cyano-4 butadienyldene portants. On obtient egalement des complexes dinucleaires avec le tricyano-3,4,4 butadienylidene-1,3. Mecanisme ses reactions de migration de l'hydrogene allylique
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10

Ierno, Hélène. "Modélisation chimique de protéines fer-soufre : synthèses et caractérisations physico-chimiques de nouveaux agrégats à ligands imidazoles." Université Joseph Fourier (Grenoble ; 1971-2015), 1995. http://www.theses.fr/1995GRE10151.

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Durant ces dernieres annees, de nombreuses proteines fer-soufre ont ete decouvertes dont le site actif est relie a l'apoproteine par des ligands non-cysteinyles ; elles presentent des proprietes spectroscopiques et electrochimiques particulieres, liees a la nature des acides amines impliques dans la coordination du cur fer-soufre. Pour modeliser la coordination d'histidines sur les centres fer-soufre, nous avons prepare des agregats a ligands imidazoles neutres. Notre demarche synthetique fait intervenir des centres fer-soufre deja formes, a ligands halogenures, sur lesquels nous realisons une reaction d'echange de ligands. De premiers essais de coordination de ligands azotes neutres sur des agregats 2fe-2s nous ont amenes a definir certains criteres pour les ligands a cycles imidazoles en vue de leur coordination. L'utilisation de ces ligands nous a ensuite permis d'isoler de nouveaux composes fer-soufre qui presentent des proprietes oxydo-reductrices proches de celles des proteines fer-soufre a ligands histidines. Enfin, nous avons etudie la reactivite des ligands imidazoles par rapport a des agregats 4fe-4s
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Books on the topic "Fe2+ complexes"

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Great Britain. Further Education Unit. FEU research projects: Current or completed. London: FEU, 1986.

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Unit, Further Education. FEU research projects: Current or completed. London: the Unit, 1987.

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Unit, Further Education. FEU research projects: Current or completed. London: the Unit, 1985.

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Unit, Further Education. FEU research projects: Current or completed. London: the Unit, 1986.

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Unit, Further Education. FEU research projects: Current or completed : March 1987. London: FEU, 1987.

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Majerus, Raymond. Thge effect of diethylenetriamine on the formatioan of (cu2+-, ni2+-, fe3+-) amyl xanthate ion complexes. Sudbury, Ont: Laurentian University Press, 1996.

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Fu bian han shu yu ji fen bian huan. Beijing Shi: Gao deng jiao yu chu ban she, 2003.

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Fu bian han shu yu ji fen bian huan. 4th ed. Beijing: Gao deng jiao yu chu ban she, 2013.

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McDougall, Mary A. (Mary Ann) and Li Yirong, eds. Jing ren de dian fen jian zhong fa: The starch solution : eat the foods you love, regain your health, and lose the weight for good. Taibei Shi: Tian xia za zhi gu fen you xian gong si, 2014.

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Hadda, Lamia, ed. Médina. Florence: Firenze University Press, 2021. http://dx.doi.org/10.36253/978-88-5518-248-5.

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Dedicated to the medina in the Mediterranean space, this book is essentially based on detailed historical and photographic research into the characteristics of city design and its evolution, as well as some case studies from direct experience. The main objective of the present study consists of its documentary and evocative value, without forgetting the analysis of the multiple architectural spaces with monumental complexes of extraordinary cultural importance arranged according to precise hierarchies and specific uses. The research summarises the different experiences from this immense Arab-Muslim architectural heritage and its urban evolution. These aspects are expressed both by the large number of case studies (from Cordoba to Palermo, passing through Fez, Séfrou, Marrakech and Tunis) as well as by the quality of the built spaces as a whole. The several contributions show an urban framework that is still legible and significant, consisting of grids of houses with forms, structures and functions that show a concentration of spaces, places and monuments stratified over time and developed in the Mediterranean countries, producing extremely diverse situations.
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Book chapters on the topic "Fe2+ complexes"

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Chu, Z. X., M. H. Mu, F. Z. Wang, and H. X. Shao. "Effects of CeCl3 on the Chi-Protein Complexes of Cucumber Chloroplasts in Relation to Fe2+." In Photosynthesis: from Light to Biosphere, 2909–12. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0173-5_682.

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Hauser, Andreas, Nahid Amstutz, Sandra Delahaye, Asmaâ Sadki, Sabine Schenker, Regula Sieber, and Mohamed Zerara. "Fine Tuning the Electronic Properties of [M(bpy)3]2+ Complexes by Chemical Pressure (M=Fe2+, Ru2+, Co2+, bpy=2,2′-Bipyridine)." In Structure and Bonding, 81–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b11307.

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Fritscher, Thomas, and Wolf-Udo Zammert. "Modell mit mehreren Konstanten / Complex Models." In FEM-Praxis mit ANSYS®, 169–72. Wiesbaden: Vieweg+Teubner Verlag, 1993. http://dx.doi.org/10.1007/978-3-322-85605-0_27.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of cyanide bridged mixed-valence dinuclear Fe2 organometallic complex." In Magnetic Properties of Paramagnetic Compounds, 521–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_284.

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Schnidman, Evan A., and William D. MacMillan. "ECB Sentiment: Decoding a Complex Monetary Union." In How the Fed Moves Markets, 115–25. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1057/9781137432582_12.

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Mitsugi, Jin, Kazuhide Ando, and Yumi Senbokuya. "A FEM for Complex Deployable Structure Analysis." In IUTAM-IASS Symposium on Deployable Structures: Theory and Applications, 281–90. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-015-9514-8_30.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of hetero-tetrametallic, Fe2(III)-Cu2(II) complex with a ketoanil." In Magnetic Properties of Paramagnetic Compounds, 869–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54237-8_498.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of hetero tetrametallic, Fe2(III)-Ni2(II) complex with a ketoanil." In Magnetic Properties of Paramagnetic Compounds, 736–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_445.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of hetero tetrametallic, Fe2(III)-Co2(II) complex with a ketoanil." In Magnetic Properties of Paramagnetic Compounds, 1185–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_702.

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Pardasani, R. T., and P. Pardasani. "Magnetic properties of hetero tetrametallic, Fe2(III)-Co2(II) complex with a ketoanil." In Magnetic Properties of Paramagnetic Compounds, 1187–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_703.

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Conference papers on the topic "Fe2+ complexes"

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Suzuki, R. "Level density in complex scaling method." In FEW-BODY PROBLEMS IN PHYSICS: The 19th European Conference on Few-Body Problems in Physics. AIP, 2005. http://dx.doi.org/10.1063/1.1933001.

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Rotschild, C., M. Saraf, A. Barak, R. A. El-Ganainy, E. Lifshitz, D. N. Christodoulides, and M. Segev. "Complex Nonlinear Opto-Fluidity." In Frontiers in Optics. Washington, D.C.: OSA, 2008. http://dx.doi.org/10.1364/fio.2008.fme2.

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Myo, T. "Continuum structures of halo nuclei in the complex scaling method." In FEW-BODY PROBLEMS IN PHYSICS: The 19th European Conference on Few-Body Problems in Physics. AIP, 2005. http://dx.doi.org/10.1063/1.1932978.

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Bringas, F. "Trajectory of complex energies of three-atomic systems for large scattering lengths." In FEW-BODY PROBLEMS IN PHYSICS: The 19th European Conference on Few-Body Problems in Physics. AIP, 2005. http://dx.doi.org/10.1063/1.1932956.

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Boukhriss, Ali, Tamou Nasser, and Ahmed Essadki. "Power control for a doubly fed induction generator." In 2012 International Conference on Complex Systems (ICCS). IEEE, 2012. http://dx.doi.org/10.1109/icocs.2012.6458549.

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Mitra, A. N., Anju Sharma, and Bani Mitra-Sodermark. "A new Baryon quantum number in complex h.o. basis." In The 14th international conference of few-body problems in physics. AIP, 1995. http://dx.doi.org/10.1063/1.48174.

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Heimann, Adriana, Alexander Hammerstrom, Tiffany Cummings, Allison Murrie, and Brett Pertunen. "CONTROLS ON IRON ISOTOPE VARIATIONS OF COMPLEX FE-TI OXIDES AT HIGH-TEMPERATURE: EFFECT OF FE3+/FE2+ RATIOS AT THE SKAERGAARD LAYERED-MAFIC INTRUSION, GREENLAND." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-359803.

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McCoy, Michael L., Rasoul Moradi, and Hamid M. Lankarani. "FEA Robustness Verification in the Modeling of 1-D Stress Wave Propagation for a Split Hopkinson Bar (SHB) Test." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89091.

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Impact loading on mechanical structures and components produces stress conditions that are large in magnitude and fluctuate with time which are difficult for the engineer to assess for design. The Stress Wave Propagation (SWP) is a classical methodology to account for these large stress levels. Due to the highly mathematical approach of stress wave theory along with consideration of boundary conditions interactions in the struck solid, the stress wave propagation method generates closed solutions to impact problems that are only 1-D in nature [1, 2]. In engineering practice, most mechanical problems are more complex than 1-D and thus numerical methods need to be applied to provide engineering solutions. The Finite Element Method (FEM) is a numerical technique that is commonly used in static and dynamic loading conditions to provide engineering solution to complex geometry and loading. In this paper, the FEM is examined to determine if this methodology is robust enough to accurately represent Stress Wave Propagation in solid mediums by the capturing wave propagation velocities, boundary reflections and transmissions along with large transient stress magnitudes using simple 2-D axisymmetrical elements. The most complex 1-D problem and perhaps the most practical solved problem by the Stress Wave Propagation is the Split Hopkinson Bar (SHB) test. The purpose of this test is to determine the dynamic strength of materials. A finite element (FE) model of an as-built SHB test apparatus was developed. In the same function as the strain gages, two nodes were used to extract the strain time histories from the FE model of the apparatus bars. It was found that the pseudo-strain gages of the FEA compared well to the SWP theory. The pulse magnitudes of strains, strain rates and stress were found extremely similar and exhibited magnitudes within 4% between SWP and direct examination. This model replicating a dynamic impact event demonstrated that the FEA can be used to solve complex impact problems involving stress wave propagation with the use of simple 2-D axisymmetric elements reducing computation time.
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Putz, Francis E. "Transitioning to a complex adaptive system approach to natural forest management in the Tropics." In Secondo Congresso Internazionale di Selvicoltura = Second International Congress of Silviculture. Accademia Italiana di Scienze Forestali, 2015. http://dx.doi.org/10.4129/2cis-fep-tra.

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Luo, Ren C., and Yong H. Kim. "Representation and recognition of 3-D curved objects using complete 3-D range data." In Medical Imaging '90, Newport Beach, 4-9 Feb 90, edited by Murray H. Loew. SPIE, 1990. http://dx.doi.org/10.1117/12.18896.

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Reports on the topic "Fe2+ complexes"

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

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Niang, Aladji Babacar, Gane Samb Lo, and Moumouni Diallo. Asymptotic laws of summands I: square integrable independent random variables. Arxiv, August 2021. http://dx.doi.org/10.16929/hs/imhotep.2021.x.002.

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This paper is part of series on self-contained papers in which a large part, if not the full extent, of the asymptotic limit theory of summands of independent random variables is exposed. Each paper of the series may be taken as review exposition but specially as a complete exposition expect a few exterior resources. For graduate students and for researchers (beginners or advanced), any paper of the series should be considered as a basis for constructing new results. The contents are taken from advanced books but the organization and the proofs use more recent tools, are given in more details and do not systematically follow previous one. Sometimes, theorems are completed and innovated
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Inkenbrandt, Paul. Time Series Analyses of a Great Basin Groundwater-Fed Wetland Complex, Juab County, Utah: Climate Effects on Groundwater-Dependent Wetlands. Utah Geological Survey, May 2020. http://dx.doi.org/10.34191/ri-282.

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Khalifa, Hesham. Modular fabrication and characterization of complex silicon carbide composite structures Advanced Reactor Technologies (ART) Research Final Report (Feb 2015 – May 2017). Office of Scientific and Technical Information (OSTI), August 2017. http://dx.doi.org/10.2172/1373739.

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Williams, D. B. ,. Watanabe, M. and Burke, M. G. Quantitative Microanalysis with high Spatial Resolution: Application of FEG-DTEM XEDS Microanalysis to the Characterization of Complex Microstructures in Irradiated Low Alloy Steet. Office of Scientific and Technical Information (OSTI), November 2001. http://dx.doi.org/10.2172/938978.

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Dare, S. A. S., D. E. Ames, P. C. Lightfoot, S.-J. Barnes, and G. Beaudoin. Trace elements in Fe-oxide minerals from fertile and barren igneous complexes: investigating their use as a vectoring tool for Ni-Cu-PGE sulphide mineralization. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296688.

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Diggs-McGee, Brandy, Eric Kreiger, Megan Kreiger, and Michael Case. Print time vs. elapsed time : a temporal analysis of a continuous printing operation. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41422.

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In additive construction, ambitious goals to fabricate a concrete building in less than 24 hours are attempted. In the field, this goal relies on a metric of print time to make this conclusion, which excludes rest time and delays. The task to complete a building in 24 hours was put to the test with the first attempt at a fully continuous print of a structurally reinforced additively constructed concrete (ACC) building. A time series analysis was performed during the construction of a 512 ft2 (16’x32’x9.25’) building to explore the effect of delays on the completion time. This analysis included a study of the variation in comprehensive layer print times, expected trends and forecasting for what is expected in future prints of similar types. Furthermore, the study included a determination and comparison of print time, elapsed time, and construction time, as well as a look at the effect of environmental conditions on the delay events. Upon finishing, the analysis concluded that the 3D-printed building was completed in 14-hours of print time, 31.2- hours elapsed time, a total of 5 days of construction time. This emphasizes that reports on newly 3D-printed constructions need to provide a definition of time that includes all possible duration periods to communicate realistic capabilities of this new technology.
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Agrawal, Asha Weinstein, and Hilary Nixon. What Do Americans Think About Federal Tax Options to Support Transportation? Results from Year Twelve of a National Survey. Mineta Transportation Institute, June 2021. http://dx.doi.org/10.31979/mti.2021.2101.

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This report summarizes the results from the twelfth year of a national public opinion survey asking U.S. adults questions related to their views on federal transportation taxes. A nationally-representative sample of 2,516 respondents completed the online survey from February 5 to 23, 2021. The questions test public opinions about raising the federal gas tax rate, replacing the federal gas tax with a new mileage fee, and imposing a mileage fee just on commercial travel. In addition to asking directly about support for these tax options, the survey collected data on respondents’ views on the quality of their local transportation system, their priorities for federal transportation spending, their knowledge about gas taxes, their views on privacy and equity matters related to mileage fees, travel behavior, and standard sociodemographic variables. This large set of variables is used to identify personal characteristics and opinions correlated with support for the tax options. Key findings include that large majorities supported transportation improvements across modes and wanted to see the federal government work towards making the transportation system well maintained, safe, and equitable, as well as to reduce the system’s impact on climate change. Findings related to gas taxes include that only 2% of respondents knew that the federal gas tax rate had not been raised in more than 20 years, and 71% of respondents supported increasing the federal gas tax by 10 cents per gallon if the revenue would be dedicated to maintenance. With respect to mileage fees, roughly half of respondents supported some form of mileage fee, whether that was assessed on all travel or just on commercial travel, 62% believe that low-income drivers should pay a reduced mileage fee rate, and 52% think that electric vehicles should pay a lower rate than gas and diesel vehicles. The analysis of trends across the survey series, which has run from 2010 to 2011, shows that support for both higher gas taxes and a hypothetical new mileage fee has risen slowly but steadily, and Americans’ experience with COVID over the past year has not disrupted those trends. Finally, support for the tax and fee options varies mostly by most personal characteristics, but there are frequently large differences correlated with age, community type, and political affiliation.
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Dare, S. A. S., D. E. Ames, P. C. Lightfoot, S. J. Barnes, and G. Beaudoin. Mineral chemistry and supporting databases for TGI4 project on "Trace elements in Fe-oxides from fertile and barren igneous complexes: Investigating their use as a vectoring tool in the intrusions that host Ni-Cu-PGE deposits". Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293640.

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Lines, Lisa M., Florence K. L. Tangka, Sonja Hoover, and Sujha Subramanian. People with Colorectal Cancer in SEER-Medicare: Part D Uptake, Costs, and Outcomes. RTI Press, May 2020. http://dx.doi.org/10.3768/rtipress.2020.rr.0037.2005.

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Limited information exists about enrollment in Part D prescription coverage by Medicare beneficiaries with cancer. Part D coverage may increase access to medicines. This study evaluated patterns of Part D uptake and costs and assessed the effects of coverage on hospitalizations and emergency department (ED) use among people with colorectal cancer (CRC). We analyzed Surveillance, Epidemiology, and End Results (SEER)–Medicare linked data on fee-for-service (FFS) Medicare beneficiaries with at least 36 months of follow-up who were diagnosed with CRC at any point from January 2007 through December 2010, and a matched cohort of beneficiaries without cancer. Dual (Medicare/Medicaid) enrollees were excluded because they are automatically enrolled in Part D. Among beneficiaries with CRC (n=12,774), 39 percent had complete Part D coverage, defined as coverage in the diagnosis year and 2 subsequent years; the rate was 38 percent in the matched comparison cohort (P=.119). Among those with complete Part D coverage, there was no significant difference in annual prescription drug costs between people with CRC ($3,157, 95% confidence interval [CI]: $3,098–$3,216) and without ($3,113, 95% CI: $3,054–$3,172). Among people with CRC, odds of ED use ranged from unchanged to marginally higher for those with no or partial Part D coverage, (adjusted odds ratio: 1.09, 95% CI: 1.00–1.18), compared with those with complete Part D coverage. Lack of continuous Part D coverage was associated with more ED use among Medicare FFS beneficiaries with CRC in 2007–2013. Among people with Part D coverage, prescription drug costs varied little between those with CRC and matched beneficiaries without cancer.
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