Academic literature on the topic 'III-Sb'
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Journal articles on the topic "III-Sb"
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Leuz, Ann-Kathrin, Hermann Mönch, and C. Annette Johnson. "Sorption of Sb(III) and Sb(V) to Goethite: Influence on Sb(III) Oxidation and Mobilization†." Environmental Science & Technology 40, no. 23 (December 2006): 7277–82. http://dx.doi.org/10.1021/es061284b.
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Sheldrick, W. S., and C. Martin. "Darstellung und Kristallstrukturen von Phenyliodoantimonaten(III). Strukturkorrelation für Halogenoantimonate(III) / Preparation and Crystal Structures of Phenyliodoantimonates(III). Structural Correlation for Haloantimonates(III)." Zeitschrift für Naturforschung B 46, no. 5 (May 1, 1991): 639–46. http://dx.doi.org/10.1515/znb-1991-0514.
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The phenyliodoantimonates(III) [Et4N][Ph2SbI2] (1), [Et4N]2[Ph2Sb2I6] (2) and [Hpy]3[Ph2Sb2I7] (3) have been prepared and their structures established by X-ray structural analysis. The anion [Ph2SbI2]⁻ displays a ψ-trigonal bipyramidal structure with axial Sb–I distances of 2.925(1) and 3.109(1) A. In the dimeric anions [Ph2Sb2I6]2- and [Ph2Sb2I7]3- the antimony atoms exhibit ψ-octahedral geometries. As observed for [Ph2SbI2]⁻, terminal Sb–I bonds in trans-position to one another display significantly different lengths. The anion [Ph2Sb2I7]3- displays Ci- symmetry with a bridging iodine atom at the crystallographic centre of symmetry. Long Sb—I distances of 3.404(1) A are observed to this atom. A structural correlation of opposite Sb–X distances (X = Cl, Br, I) in linear three centre X–Sb ··· X interactions is presented. The sum of the bond valences in iodoantimonates(III) is a minimum for symmetrical I–Sb–I three centre bonds, reflecting thereby the antibonding influence of the Sb 5 s-orbital. This influence is considerably smaller for bromoantimonates(III) and may be effectively neglected for chloroantimonates(III).
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Kirsch, R., A. C. Scheinost, A. Rossberg, D. Banerjee, and L. Charlet. "Reduction of antimony by nano-particulate magnetite and mackinawite." Mineralogical Magazine 72, no. 1 (February 2008): 185–89. http://dx.doi.org/10.1180/minmag.2008.072.1.185.
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AbstractThe speciation of antimony is strongly influenced by its oxidation state (V, III, 0, —III). Redox processes under anaerobic groundwater conditions may therefore greatly alter the environmental behaviour of Sb. Employing X-ray absorption and photoelectron spectroscopy, we show here that Sb(V) is reduced to Sb(III) by magnetite and mackinawite, two ubiquitous Fe(II)-containing minerals, while Sb(III) is not reduced further. At the surface of magnetite, Sb(III) forms a highly symmetrical sorption complex at the position otherwise occupied by tetrahedral Fe(III). The Sb(V) reduction increases with pH, and at pH values >6.5 Sb(V) is completely reduced to Sb(III) within 30 days. In contrast, at the mackinawite surface, Sb(V) is completely reduced across a wide pH range and within 1 h. The Sb(V) reduction proceeds solely by oxidation of surface Fe(II), while the oxidation state of sulphide is conserved. Independent of whether Sb(V) or Sb(III) was added, an amorphous or nano-particulate SbS3-like solid formed.
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Terry, Lee R., Thomas R. Kulp, Heather Wiatrowski, Laurence G. Miller, and Ronald S. Oremland. "Microbiological Oxidation of Antimony(III) with Oxygen or Nitrate by Bacteria Isolated from Contaminated Mine Sediments." Applied and Environmental Microbiology 81, no. 24 (October 2, 2015): 8478–88. http://dx.doi.org/10.1128/aem.01970-15.
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ABSTRACTBacterial oxidation of arsenite [As(III)] is a well-studied and important biogeochemical pathway that directly influences the mobility and toxicity of arsenic in the environment. In contrast, little is known about microbiological oxidation of the chemically similar anion antimonite [Sb(III)]. In this study, two bacterial strains, designated IDSBO-1 and IDSBO-4, which grow on tartrate compounds and oxidize Sb(III) using either oxygen or nitrate, respectively, as a terminal electron acceptor, were isolated from contaminated mine sediments. Both isolates belonged to theComamonadaceaefamily and were 99% similar to previously described species. We identify these novel strains asHydrogenophagataeniospiralisstrain IDSBO-1 andVariovorax paradoxusstrain IDSBO-4. Both strains possess a gene with homology to theaioAgene, which encodes an As(III)-oxidase, and both oxidize As(III) aerobically, but only IDSBO-4 oxidized Sb(III) in the presence of air, while strain IDSBO-1 could achieve this via nitrate respiration. Our results suggest that expression ofaioAis not induced by Sb(III) but may be involved in Sb(III) oxidation along with an Sb(III)-specific pathway. Phylogenetic analysis of proteins encoded by theaioAgenes revealed a close sequence similarity (90%) among the two isolates and other known As(III)-oxidizing bacteria, particularlyAcidovoraxsp. strain NO1. Both isolates were capable of chemolithoautotrophic growth using As(III) as a primary electron donor, and strain IDSBO-4 exhibited incorporation of radiolabeled [14C]bicarbonate while oxidizing Sb(III) from Sb(III)-tartrate, suggesting possible Sb(III)-dependent autotrophy. Enrichment cultures produced the Sb(V) oxide mineral mopungite and lesser amounts of Sb(III)-bearing senarmontite as precipitates.
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Herlinawati, Herlinawati, Buchari Buchari, and M. Bachri Amran. "Separation of Sb (V) and Sb (III) antimony compounds using anion exchange chromatography technique." Jurnal Pendidikan Kimia 12, no. 3 (December 30, 2020): 164–69. http://dx.doi.org/10.24114/jpkim.v12i3.21186.
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Separation of Sb (V) and Sb (III) antimony compounds using anion exchange chromatography technique have been done. To obtain the separation of Sb (V) and Sb (III) antimony compounds which is good in this study have been studied several parameters of separation in anion exchange chromatography technique. Parameters that influence the process of separation of Sb (V) and Sb (III) antimony compounds is the concentration and pH of the mobile phase (eluent) have been evaluated. The separation of Sb (V) and Sb (III) antimony compounds is good and optimum obtained using an eluent 200 mM phosphate buffer at pH 7 with a flow rate of 1 mL/min. Based on the optimum conditions for the separation of Sb (V) and Sb (III) antimony compounds with anion exchange chromatography method has generated value the capacity factor (k ') Sb (V) and Sb (III) obtained are respectively 1.77 and 3.01. While the value of selectivity (α), Number of theoretical plates (N) and Resolution (Rs) obtained are respectively 1.70; 369.48; and 1.48.
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Xi, Jianhong, and Mengchang He. "Removal of Sb(III) and Sb(V) from aqueous media by goethite." Water Quality Research Journal 48, no. 3 (August 1, 2013): 223–31. http://dx.doi.org/10.2166/wqrjc.2013.030.
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This study investigated the removal of Sb(III) and Sb(V) from aqueous media through their adsorption onto oxide minerals (goethite) under a set of conditions (initial Sb concentration, pH, reaction time, and interaction temperature). The kinetic studies suggested that the adsorption equilibriums for both Sb(III) and Sb(V) were achieved within 24 h. The adsorption data collected at three different temperatures were successfully modeled using both the Langmuir and Freundlich isotherms. The adsorption of Sb(III) onto goethite was greater than that of Sb(V) at the three investigated temperatures. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) were calculated from the dependence of the adsorption process on the reaction temperature, and the calculated parameters suggest that the adsorption of both Sb(III) and Sb(V) onto goethite is spontaneously endothermic. The adsorption of Sb(III) and Sb(V) on goethite was dependent on pH within the investigated pH range.
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Lehr, Corinne R., Des R. Kashyap, and Timothy R. McDermott. "New Insights into Microbial Oxidation of Antimony and Arsenic." Applied and Environmental Microbiology 73, no. 7 (February 16, 2007): 2386–89. http://dx.doi.org/10.1128/aem.02789-06.
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ABSTRACT Sb(III) oxidation was documented in an Agrobacterium tumefaciens isolate that can also oxidize As(III). Equivalent Sb(III) oxidation rates were observed in the parental wild-type organism and in two well-characterized mutants that cannot oxidize As(III) for fundamentally different reasons. Therefore, despite the literature suggesting that Sb(III) and As(III) may be biochemical analogs, Sb(III) oxidation is catalyzed by a pathway different than that used for As(III). Sb(III) and As(III) oxidation was also observed for an eukaryotic acidothermophilic alga belonging to the order Cyanidiales, implying that the ability to oxidize metalloids may be phylogenetically widespread.
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Wang, Qian, Thomas P. Warelow, Yoon-Suk Kang, Christine Romano, Thomas H. Osborne, Corinne R. Lehr, Brian Bothner, Timothy R. McDermott, Joanne M. Santini, and Gejiao Wang. "Arsenite Oxidase Also Functions as an Antimonite Oxidase." Applied and Environmental Microbiology 81, no. 6 (January 9, 2015): 1959–65. http://dx.doi.org/10.1128/aem.02981-14.
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ABSTRACTArsenic and antimony are toxic metalloids and are considered priority environmental pollutants by the U.S. Environmental Protection Agency. Significant advances have been made in understanding microbe-arsenic interactions and how they influence arsenic redox speciation in the environment. However, even the most basic features of how and why a microorganism detects and reacts to antimony remain poorly understood. Previous work withAgrobacterium tumefaciensstrain 5A concluded that oxidation of antimonite [Sb(III)] and arsenite [As(III)] required different biochemical pathways. Here, we show within vivoexperiments that a mutation inaioA[encoding the large subunit of As(III) oxidase] reduces the ability to oxidize Sb(III) by approximately one-third relative to the ability of the wild type. Further,in vitrostudies with the purified As(III) oxidase fromRhizobiumsp. strain NT-26 (AioA shares 94% amino acid sequence identity with AioA ofA. tumefaciens) provide direct evidence of Sb(III) oxidation but also show a significantly decreasedVmaxcompared to that of As(III) oxidation. TheaioBAgenes encoding As(III) oxidase are induced by As(III) but not by Sb(III), whereasarsRgene expression is induced by both As(III) and Sb(III), suggesting that detection and transcriptional responses for As(III) and Sb(III) differ. While Sb(III) and As(III) are similar with respect to cellular extrusion (ArsB or Acr3) and interaction with ArsR, they differ in the regulatory mechanisms that control the expression of genes encoding the different Ars or Aio activities. In summary, this study documents an enzymatic basis for microbial Sb(III) oxidation, although additional Sb(III) oxidation activity also is apparent in this bacterium.
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Zhu, Huijie, Qiang Huang, Mingyan Shi, Shuai Fu, Xiuji Zhang, Zhe Yang, Jianhong Lu, and Bo Liu. "Adsorption of Sb(III) from Aqueous Solution by nZVI/AC: A Magnetic Fixed-Bed Column Study." Nanomaterials 11, no. 8 (July 25, 2021): 1912. http://dx.doi.org/10.3390/nano11081912.
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The effectiveness of nanoscale zero-valent iron(nZVI) immobilized on activated carbon (nZVI/AC) in removing antimonite (Sb(III)) from simulated contaminated water was investigated with and without a magnetic fix-bed column reactor. The experiments were all conducted in fixed-bed columns. A weak magnetic field (WMF) was proposed to increase the exclusion of paramagnetic Sb(III) ions by nZVI/AC. The Sb(III) adsorption to the nZVI and AC surfaces, as well as the transformation of Sb(III) to Sb(V) by them, were both increased by using a WMF in nZVI/AC. The increased sequestration of Sb(III) by nZVI/AC in the presence of WMF was followed by faster nZVI corrosion and dissolution. Experiments were conducted as a function of the pH of the feed solution (pH 5.0–9.0), liquid flow rate (5–15 mL·min−1), starting Sb(III) concentration (0.5–1.5 mg·L−1), bed height nZVI/AC (10–40 cm), and starting Sb(III) concentration (0.5–1.5 mg·L−1). By analyzing the breakthrough curves generated by different flow rates, different pH values, different inlet Sb(III) concentrations, and different bed heights, the adsorbed amounts, equilibrium nZVI uptakes, and total Sb(III) removal percentage were calculated in relation to effluent volumes. At pH 5.0, the longest nZVI breakthrough time and maximal Sb(III) adsorption were achieved. The findings revealed that the column performed effectively at the lowest flow rate. With increasing bed height, column bed capacity and exhaustion time increased as well. Increasing the Sb(III) initial concentration from 0.5 to 1.5 mg·L−1 resulted in the rise of adsorption bed capacity from 3.45 to 6.33 mg·g−1.
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Mantha, Zoi, Manassis Mitrakas, Nikos Tzollas, Stelios Stylianou, Ioannis Katsoyiannis, and Anastasios Zouboulis. "Removal of Antimony Species, Sb(III)/Sb(V), from Water by Using Iron Coagulants." Water 10, no. 10 (September 25, 2018): 1328. http://dx.doi.org/10.3390/w10101328.
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Antimony (Sb) is classified as a toxic pollutant of high priority, because its effects on human health (toxicity) are similar to those of arsenic. However, unlike arsenic, the removal of antimony from polluted waters is still not well understood. In the present study the removal of common antimony species in water, namely, Sb(III) and Sb(V), was investigated by the addition of iron-based coagulants. The applied coagulants were Fe(II), Fe(III), and equimolar mixed Fe(II)/Fe(III) salts and the experiments were performed with realistic antimony concentrations in the range 10–100 μg/L, by using artificially polluted tap water solutions. Sb(III) removal by Fe(III) provided better adsorption capacity at a residual concentration equal to the drinking water regulation limit of 5 μg/L, that is, Q5 = 4.7 μg Sb(III)/mg Fe(III) at pH 7, which was much higher than the value achieved by the addition of Fe(II) salts, that is, Q5 = 0.45 μg Sb(III)/mg Fe(II), at the same pH value. Similarly, Sb(V) was more efficiently removed by Fe(III) addition, than by the other examined coagulants. However, Fe(III) uptake capacity for Sb(V) was found to be significantly lower, that is, Q5 = 1.82 μg Sb(V)/mg Fe(III), than the corresponding value for Sb(III). The obtained results can give a realistic overview of the efficiency of conventionally used iron-based coagulants and of their mixture for achieving Sb concentrations below the respective drinking water regulation limit and therefore, they can be subsequently applied for the designing of real-scale water treatment units.
Dissertations / Theses on the topic "III-Sb"
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Tournet, Julie. "III-Sb-based solar cells and their integration on Si." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS003/document.
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Les matériaux III-Sb ont prouvé leur potentiel pour la réalisation de composants opto-électroniques dans des domaines aussi variés que les télécommunications ou l'environnement. Cependant, ils restent une filière quasi-inexplorée pour les systèmes photovoltaïques classiques. Dans ce projet de recherche, nous voulons démontrer que les composants à base d'antimoniures sont des candidats prometteurs pour des cellules solaires à haute efficacité et bas coût. Leurs avantages sont multiples : non seulement offrent-ils un large panel d'alliages accordés en maille et des jonctions tunnel à basse résistivité, mais ils permettent aussi une croissance directe sur substrat de Si. Nous étudions donc les briques élémentaires d'une cellule solaire multi-jonction intégrée sur Si. Tout d'abord, nous développons la croissance et fabrication de cellules homo-épitaxiales en GaSb. Les caractéristiques tension-intensité (J-V) mesurées sont proches de l'état de l'art avec une efficacité sous un soleil de 5.9 %. Puis, nous intégrons une cellule à simple jonction GaSb sur un substrat de Si par épitaxie par jet moléculaire (EJM). Les analyses de diffraction X (DRX) et de microscopie à force atomique (AFM) montrent des propriétés de structure et morphologie proches de celles reportées pour des buffers métamorphiques similaires dans la littérature. Nous adaptons alors la configuration de la cellule pour éviter la haute densité de défauts à l'interface GaSb/Si. La cellule hétéro-épitaxiale a une efficacité réduite de 0.6 %. Ce résultat est néanmoins proche des dernières avancées sur les cellules GaSb sur GaAs, et ce, malgré un désaccord de maille plus important. Enfin, nous étudions l'épitaxie d'AlInAsSb. Cet alliage pourrait en théorie atteindre une grande gamme d'énergies de bande interdite tout en restant accordé sur GaSb. Néanmoins, il souffre d'une lacune de miscibilité importante, le rendant sujet à la ségrégation de phase. Il n'y a que peu de mentions de l'AlInAsSb dans la littérature, et toutes rapportent des conditions de croissance instables et des énergies de bande interdite plus basses qu'attendues. Nous réussissons à produire des couches de bonne qualité d'AlInAsSb dont la composition en Al varie de 0.25 à 0.75 et ne présentant aucun signe macroscopique de décomposition de phase. Toutefois, l'observation au microscope à transmission électronique (TEM) révèle des fluctuations de composition nanométriques. Les données de photoluminescence (PL) sont étudiées pour déterminer les propriétés électroniques de l'alliage. Les mesures d'efficacité quantique (QE) montrent que la sous-cellule du haut limite la performance de la cellule tandem. Des modélisations numériques des courbes J-V et QE sont utilisées pour identifier des pistes d'amélioration pour chaque brique élémentaireIII-Sb materials have demonstrated their potential for multiple opto-electronic devices, with applications stretching from communications to environment. However, they remain an almost unexplored segment for classical photovoltaic systems. In this research, we intend to demonstrate that III-Sb-based devices are promising candidates for high-efficiency, low-cost solar cells. Their benefits are two-fold: not only do they offer a wide range of lattice-matched alloys and low-resistivity tunnel junctions, but they also enable direct growth on Si substrates. We thus investigate the building blocks of a GaSb-based multi-junction solar cell integrated onto Si. First, we develop the photovoltaic growth and processing by fabricating homo-epitaxial GaSb cells. Intensity-voltage (J-V) measurements approach the state of the art with 1-sun efficiency of 5.9%. Then, we integrate a GaSb single-junction cell on a Si substrate by molecular beam epitaxy (MBE). X-ray diffraction (XRD) and atomic force microscopy (AFM) analysis show structural and morphological properties close to the best reported in the literature for similar metamorphic buffers. We further adapt the cell configuration to circumvent the high defect density at the GaSb/Si interface. The heteroepitaxial cell results in a reduced efficiency of 0.6%. Nevertheless, this performance is close the most recent advancements on GaSb heteroepitaxial cells on GaAs, despite a much larger mismatch. Last, we investigate the epitaxy of AlInAsSb. This alloy could in theory reach the widest range of bandgap energies while being lattice-matched to GaSb. However, it presents a large miscibility gap, making it vulnerable to phase segregation. AlInAsSb only counts few experimental reports in the literature, all referring to unoptimized growth conditions and abnormally low bandgap energies. We successfully grow good-quality layers with Al composition x_{Al} ranging from 0.25 to 0.75, showing no macroscopic sign of decomposition. Yet, transmission electron microscopy (TEM) observations point to nanometric fluctuations of the quaternary composition. Photoluminescence (PL) data is studied to determine the alloy's electronic properties. We eventually propose and fabricate a tandem cell structure, resulting in 5.2% efficiency. Quantum Efficiency (QE) measurements reveal that the top subcell is limiting the tandem performance. Numerical fits to both J-V and QE data indicate improvement paths for each building block
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Jones, S. A. "Characterisation and thermal analysis of antimony(III) oxy-compounds." Thesis, Liverpool John Moores University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380656.
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Jaimes, Edgar Hernando Lizarazo. "Estudo da atividade leishmanicida de novos complexos de Sb(III) e Bi(III) com ligantes polipiridínicos." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/SFSA-97ZV89.
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The activity of a series of polypyridyl compounds 2,2 '-bipyridine (bipy),
1,10-phenanthroline (Phen), dipyrido [3,2-d: 2', 3'-f]quinoxaline (dpq) and
dipyrido [3 0.2-a: 2 ', 3'-c]phenazine (dppz) was evaluated in vitro against
the promastigote form of Sb(III)-sensitive and resistant Leishmania
infantum chagasi and Leishmania amazonensis strains. All compounds were more active than potassium antimony tartrate, used as control drug. The bipy, Phen and dpq showed inhibitory concentration IC50 values in the nanomolar range. Two novel trivalent antimony(III) and bismuth(III) complexes with the nitrogen-donor heterocyclic ligand dipyrido[3,2-a:2',3'-c]phenazine (dppz) were synthesized and characterized as [Sb(dppz)Cl3]·H2O·CH3OH and [Bi(dppz)Cl3]. The crystal structure of Sb(III) complex was determined by X-ray crystallography. These complexes were evaluated for their activity
against the promastigote form of Sb(III)-sensitive and resistant
Leishmania strains. Both complexes were more effective than dppz alone in inhibiting the growth of Leishmania promastigotes and were at least 77 and 2400 times more active than potassium antimonyl tartrate in Sb(III)- sensitive and -resistant Leishmania, respectively. The cytotoxicity of dppz and its complexes against mouse peritoneal macrophages occurred at dppz concentrations at least 6-fold greater than those found to be active against Leishmania promastigotes. To investigate the role of the metal in the improved antileishmanial activity of dppz, the activity of the Sb(III) complex was compared between the Sb-resistant mutants and their respective parental sensitive strains. The lack of cross-resistance to the Sb(III)-dppz complex together with the much lower activity of antimonyl tartrate, SbCl3 and BiCl3 strongly support the model that the metal is not active by itself but improves the activity of dppz through complexation.
Five Sb(III) complexes with 2,2'-bipyridine (bipy), 1,10-phenanthroline
(Phen), dipyrido [3,2-d: 2',3'-f]quinoxaline (dpq) were prepared and
characterized as: [Sb(bipy)Cl3], [Sb(bipy)Cl2], [Sb(Phen)Cl3],
[Sb(Phen)Cl2] e [Sb(dpq)Cl3]. The crystal structures of the complexes with 1,10-phenanthroline were determined for the first time by X ray diffraction. These complexes were evaluated for their activity against Sb(III)-sensitive and resistant Leishmania promastigotes. The leishmanicidal activities of these complexes were higher than those of potassium antimonyl tartrate. All the complexes obtained from the SbCl3 salt were more active than the salt itself. On the other hand, than SbCl2 salt was found to be highly active and more effective than the
[Sb(bipy)Cl2] complex. The coordination of Sb (III) caused a significant improvement in the activity of Phen complex against parasites of L. infantum chagasi. Studies of the interaction of these compounds with a peptide model of the zinc finger domain of the HIV-1 NCp7 proteín (KGC), showed that these complexes formed new species with the peptide. Studies of Phen interaction with the Zn(II)-KGC system, indicated that Phen induceds the ejection of Zn(II) from the zinc finger domain.A atividade da série de compostos polipiridínicos 2,2´-bipiridina (bipy), 1,10-fenantrolina (phen), dipirido[3,2-d:2´,3´-f]quinoxalina (dpq) e dipirido[3,2-a:2',3'-c]fenazina (dppz) foi avaliada contra formas promastigotas, sensíveis e resistentes ao Sb(III), em cepas de Leishmania infantum chagasi e Leishmania amazonensis. Todos os compostos foram mais ativos que o medicamento usado como controle, o tartarato de antimônio e potássio. O grupo bipy, phen e dpq apresentou valores de concentração inibitória CI50 na ordem de nmol L-1, enquanto que os compostos do dppz apresentaram na ordem de µmol L-1. Foram sintetizados e caracterizados por métodos de análises físico-químicos dois compostos inéditos de Sb(III) e Bi(III) com o ligante dipirido[3,2-a:2´,3´-c]fenazina (dppz): [Sb(dppz)Cl3] e [Bi(dppz)Cl3]. As estruturas cristalinas desses complexos foram determinadas por difração de raios X de monocristal. A atividade desses complexos foi avaliada contra formas promastigotas sensíveis e resistentes ao Sb(III) em cepas de Leishmania infantum chagasi e Leishmania amazonensis. A toxicidade do ligante e dos complexos foi avaliada em macrófagos peritoneais de camundongo. Os valores da concentração inibitória CI50 dos complexos em promastigotas de Leishmania foram muito menores que a concentração citotóxica CC50 em macrófagos peritoneais de camundongo. Para o dppz, e os complexos de Bi(III) e Sb(III), o índice de seletividade, calculado como CC50/CI50, foi 12,5, 4,8 e 7,0, respectivamente. Foram preparados e caracterizados por métodos de análises físico-químicos cinco complexos de Sb(III) contendo os derivados polipiridínicos 2,2´- bipiridina (bipy), 1,10-fenatrolina (phen) e dipirido[3,2-d:2´,3´- f]quinoxalina (dpq): [Sb(bipy)Cl3], [Sb(bipy)?Cl2], [Sb(phen)Cl3], [Sb(phen)?Cl2] e [Sb(dpq)Cl3]. As estruturas cristalinas dos complexos da 1,10-fenantrolina foram determinadas pela primeira vez por difração de raios X. A atividade desses complexos foi avaliada contra formas promastigotas sensíveis e resistentes ao Sb(III) em cepas de Leishmania infantum chagasi e Leishmania amazonensis. A atividade leishmanicida de todos os complexos foi muito superior quando comparados com a droga controle, o tartarato de antimônio(III) e potássio . Todos os complexos obtidos a partir do sal SbCl3 apresentaram-se muito mais ativos que o sal. Em contraste, o complexo [Sb(bipy)?Cl2] apresentou menor atividade que o sal ?SbCl2. A coordenação do Sb(III) promoveu melhora significativa da atividade nos complexos da phen contra parasitas de L. infantum chagasi. Os estudos de interação desses complexos com um modelo peptídico derivado da proteína nucleocapsídica NCp7 do vírus HIV (KGC) mostraram a capacidade desses complexos de formar novas espécies com o peptídeo. Os estudos de interação da phen com o sistema Zn(II)-KGC, mostraram a capacidade da phen para ejetar o Zn(II) do domínio dedo de zinco.
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VIEIRA, FLAVIA DE ALMEIDA. "DEVELOPMENT OF AN ANALYTICAL METHOD FOR THE DETERMINATION OF TMSB, SB(V) AND SB(III) IN CLINICAL SAMPLES BY IC-ICPMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2003. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4472@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROA administração de antimoniais no tratamento da leishmaniose é uma rara oportunidade para estudar o metabolismo de antimônio e das suas espécies químicas. Tais estudos são de grande relevância, uma vez que não se tem conhecimento sobre os metabólitos formados no corpo humano e da sua possível importância na erradicação dos parasitas causadoras da doença, assim como sobre os mecanismos de eliminação deste elemento tóxico. Ao contrário do arsênio, existem poucas metodologias reportadas para a análise de especiação de antimônio em amostras clínicas. O presente trabalho é uma continuação de pesquisas realizadas e publicadas anteriormente, nas quais a técnica de espectrometria de massas (ICPMS) acoplada à cromatografia iônica de alta eficiência IC-(HPLC) foi utilizada para separação e quantificação, em linha, de antimoniato de N-metil glucamina, Sb(V) e Sb(III) em amostras de plasma e urina. Assim, serão apresentados resultados recentes obtidos com o emprego de uma coluna com melhor resolução (Metrosep - A Supp5; 250 mm x 4,0 mm; Metrohm, Suíça) na separação de trimetil antimônio (TMSb), Sb(V) e Sb(III). Testes de otimização mostraram que uma solução de EDTA (0,006 mol L-1, pH 4,7) é adequada como fase móvel para a separação das três espécies. Os tempos de retenção para TMSb, Sb(V) e Sb(III) foram de 44,2 s, 150,6 s e 548,4 s, respectivamente, permitindo uma perfeita e repetitiva (DPR <3 por cento) separação dessas espécies. Repetitividades melhores que 4 por cento foram também obtidas na quantificação das áreas dos três picos cromatográficos correspondentes. Curvas analíticas, construídas a partir de soluções padrão das espécies em solução aquosa e em amostras de urina fortificadas, apresentaram ótima linearidade com coeficientes de correlação maiores que 0,999. Para volumes de amostra de 100 uL, injetados na coluna e utilizando-se o espectrômetro ELAN 5000 (PE-Sciex, EUA) como detector multielementar, em combinação com o nebulizador concêntrico tipo Meinhard e uma câmara ciclônica, limites absolutos de quantificação de 0,02 ng de antimônio foram obtidas para as três espécies estudadas. Testes de estabilidade mostraram que Sb(V) sofre alterações químicas já em intervalos de tempo relativamente curtos (maiores que 8h em água, e que 4h em urina fortificada) enquanto que TMSb e Sb(III) evidenciaram estabilidades consideravelmente maiores em ambos os meios.
Clinical applications of antimonials in the treatment of leishmaniasis are a unique opportunity to study the metabolism of antimony and its species in the human body. As little is known about antimony metabolism, studies are required to improve the knowledge about the excretion mechanism of this toxic element; in particular, those which deal with antimony metabolites and the action of antimonials for the eradication of leishmaniasis causing parasites. In contrast with its chemical analogue arsenic, only a few methods concerning antimony speciation in clinical samples have been described in the literature. The aim of the present work was to improve a method previously developed to separate and quantify N-methyl meglumine antimoniate, Sb(V) and Sb(III) in blood plasma and urine samples by using anion exchange high performance liquid chromatography (IC-HPLC) coupled with inductively-coupled plasma mass spectrometry (ICPMS). Results on the application of an ion chromatography column (Metrosep - A Supp5; 250 mm x 4.0 mm; Metrohm, Swiss) with better resolution for the separation of TMSb, Sb(V) and Sb(III) are presented. The optimum conditions for the separation of the three species were established with 0.006 mol L-1 EDTA at pH 4.7 as the mobile phase. The retention times for TMSb, Sb(V) and Sb(III) were 44,2 s, 151,6 s and 548,4 s, respectively. A robust linear relationship between concentration and peak area was obtained for the three species, both, in aqueous standard solutions and spiked urine samples, with an associated correlation factor higher than 0,999. Relative standard deviations below 4 percent have been obtained in the peak area quantification mode. When using the ELAN 5000 (PerkinElmer-Sciex, EUA) equipped with a concentric Meinhard nebulizer in combination with a cyclonic spray chamber as detector, and employing a 100-uL injection loop in the HPLC system, typical absolute limits of quantification were 0.02 ng of Sb for each of the three antimony species studied. Stability tests showed that Sb(V) suffers chemical alterations within a short time period (>8h in aqueous solutions and >4h in spiked urine), whereas TMSb and Sb(III) presented better stability conditions in both solutions.
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Siqueira, Graciane Ramos de. "Síntese, caracterização e estudo da atividade biológica de complexos dos elementos pnictogênicos Sb(III) e Bi(III) com ligantes ditiois multifuncionais." Universidade Federal de Minas Gerais, 2013. http://hdl.handle.net/1843/SFSA-9GATWH.
Full textAbstract:
This present work discusses the synthesis and characterization of
multifunctional di(tri)thiols ligands and their complexes with the pnictogenics elements Sb(III) and Bi(III). In addition, it is reported a brief biological study, especially antibacterial, exhibited by the complexes obtained. Chapter 1 contains a collection of short texts which describe the
organosulfured compounds, especially thiols, and compounds of antimony and bismuth and their medicinal properties, besides the epidemiological problems of the ulcer caused by Helycobacter pylori, the leishmaniasis and the bacterial infections. Moreover, it is presented the rationale, the relevance and objectives of the work. In Chapter 2 is presented the results concerning the preparation of the multifunctional di(tri)thiols ligands I: bis(2-tiolethyl)amine, II:bis(2-tiolethyl)ether, III:
bis(3-tiolpropyl)sulfide and IV: tris(2-tiolethyl)amine, besides their di(tri)chlorinated and di(tri)isotioureide precursors. All the compounds in question were characterized by conventional techniques such as melting point or boiling point and infrared and nuclear magnetic resonance (1H and 13C) spectroscopy. In Chapter 3 it is described the process of synthesis and characterization of the pnictogenic elements complexes with the ligands obtained with success Ia: Bi{[HN(CH2CH2S)2]Cl}, Ib: {Sb[HN(CH2CH2S)2]Cl}, IIa: {Bi[O(CH2CH2S)2]Cl}, IIb:
{Sb[O(CH2CH2S)2]Cl}, IIIa: {Bi[S(CH2CH2CH2S)2]Cl} and IIIb: {Sb[S(CH2CH2CH2S)2]Cl}. The successfully obtained complexes were characterized by techniques like elemental analysis and infrared and multinuclear magnetic resonance (1H, 13C) spectroscopy. The
crystal structures of the complexes obtained with the ligand I - Ia and Ib - were also determined by X-ray diffraction. Both series of bismuth and antimony complexes underwent initial evaluation of antibacterial activity , described in Chapter 4 . It is presented initial profiles of growth
inhibiting of Gram-positive and Gram-negative bacteria, all of them human pathogens: S. aureus, L. monocytogenes, B. cereus, S. sanguinis, E. coli and S. typhimurium. Finally, Chapter 5 presents the conclusions and the perspectives obtained in the operation of this work, followed by the references and required attachments.O presente trabalho aborda a síntese e caracterização de ligantes di(tri)tiois multifuncionais e seus complexos formados com os elementos pnictogênicos Sb(III) e Bi(III). Além disso, relata-se um breve estudo biológico, sobretudo antibacteriano, exibido pelos complexos obtidos. O Capítulo 1 contém uma coleção de breves textos que descrevem os compostos organossulfurados, sobretudo os tiois, e os compostos de bismuto e antimônio e suas propriedades medicinais, além dos problemas epidemiológicos da úlcera causada por Helycobacter pilori, da leishmaniose e das infecções bacterianas. Ademais, são apresentadas as justificativas, relevância e objetivos do trabalho. No tocante ao Capítulo 2, são apresentados os resultados referentes à preparação dos ligantes di(tri)tiois multifuncionais I: bis(2-tioletil)amina, II: bis(2-tioletil)éter, III: bis(3-tiolpropil)sulfeto e IV: tris(2-tioletil)amina, além de seus precursores di(tri)clorados e di(tri)isotioureídos. Todos os compostos em questão foram caracterizados por técnicas convencionais como ponto de fusão ou ebulição e espectroscopias na região do infravermelho e de ressonância magnética nuclear (1H e 13C). No Capítulo 3 são descritos os processos de síntese e caracterização de complexos dos elementos pnictogênicos com os ligantes obtidos com sucesso Ia: {Bi[HN(CH2CH2S)2]Cl}, Ib: {Sb[HN(CH2CH2S)2]Cl}, IIa: {Bi[O(CH2CH2S)2]Cl}, IIb: {Sb[O(CH2CH2S)2]Cl}, IIIa: {Bi[S(CH2CH2CH2S)2]Cl} e IIIb: {Sb[S(CH2CH2CH2S)2]Cl}. Os complexos obtidos com sucesso foram caracterizados por técnicas como análise elementar e espectroscopias na região do infravermelho e de ressonância magnética multinuclear (1H, 13C). As estruturas cristalográficas dos complexos inéditos obtidos com o ligante I ¿ Ia e Ib ¿ foram também determinadas por difração de raios X. Ambas as séries de complexos de bismuto e antimônio foram submetidas à avaliação inicial de atividade antibacteriana, descrita no Capítulo 4. São apresentados perfis iniciais de inibição do crescimento de bactérias Gram-positivas e Gramnegativas, todas patógenos ao ser humano: S. aureus, L. monocytogenes, B. cereus, S. sanguinis, E. coli e S. typhimurium. Finalmente o Capítulo 5 apresenta as Conclusões e Perspectivas obtidas com a realização desse trabalho, seguidas das referências bibliográficas e dos anexos necessários.
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Dumas, Eddy. "Synthèse et caractérisation de polyoxomolybdates et de polyoxovanadates réduits en présence d'un hétéroélement possédant une paire d'électrons libre : As(III) et Sb(III)." Versailles-St Quentin en Yvelines, 1998. http://www.theses.fr/1998VERS0014.
Full textAbstract:
Le @thème de ce travail est l'étude de la réactivité de complexes oxo de mentaux de transition en milieu réducteur, ainsi que la synthèse et la caractérisation d'hétéropolyoxomolybdates réduits et d'hétéropolyoxovanadates réduits. L'hétéroélement utilisé, As(III) ou Sb(III), présente la particularité de posséder une paire libre susceptible d'induire une stéréochimie originale lors des processus de polycondensation. Les synthèses dites classiques (conditions de température et de pression ordinaires) et les synthèses hydrothermales ont été développées en parallèle pour l'étude des différents systèmes. . .
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Silva, Andreza Cristina Souza [UNESP]. "'ZN IND.7'SB IND. 2'O IND. 12' contendo Ce(III), Pr(III) ou Eu(III): investigação de suas propriedades estruturais e ópticas para potencial aplicação como cintilador." Universidade Estadual Paulista (UNESP), 2012. http://hdl.handle.net/11449/97923.
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A matriz estudada é uma cerâmica a base de Zn7Sb2O12, que possui estrutura do tipo espinélio inverso. A dopagem desta cerâmica com íons TR gera materiais com propriedades diferentes das da fase original que podem apresentar melhor desempenho. Estudos preliminares, onde foram feitas dopagens do tipo Zn7-3xTR2xSb2O12 [TR = Ce(III), Pr(III) e Eu(III)], confirmaram a alta capacidade de absorção dos íons TR nesta estrutura pela manifestação de luminescência destes sistemas saturados. Ademais, as propriedades ópticas das amostras dopadas com Eu(III) auxiliaram na avaliação da ocupação dos íons dopantes na estrutura do Zn7Sb2O12. Assim, o principal objetivo deste trabalho foi a utilização da matriz Zn7Sb2O12 como estrutura hospedeira dos dopantes Eu(III), Pr(III) e Ce(III), estudando suas características estruturais e espectroscópicas e investigando suas potencialidades como material cintilador. Como objetivo secundário, tentou-se confeccionar uma fibra policristalina a partir do material em pó contendo 9% de Eu(III), através da técnica de fusão de zona com laser. A análise estrutural dos sistemas estudados confirmou a formação da fase α-Zn7Sb2O12 e pôde-se identificar uma pequena fração das fases β-Zn7Sb2O12 e Zincita de ZnO, cuja variação foi associada ao tipo do íon dopante. Dados de espectroscopia no IV confirmaram que a ocupação dos dopantes na rede do semicondutor não é substitucional aos sítios de Sb(V) ou Zn(II). Desta forma, a partir da espectroscopia de luminescência, os diversos sítios não substitucionais foram investigados utilizando tanto excitação UV-VIS quanto raios X. No caso do sistema contendo Eu(III) observou-se que, sob excitação via raios X, todos os sítios emitem por meio de um mecanismo...
The matrix studied is a ceramic based on Zn7Sb2O12 with inverse spinel type structure. The doping of this ceramic with RE ions generates materials with different properties from the original phase that can perform better. In preliminary studies the Zn7-3xRE2xSb2O12 [RE = Ce(III), Pr(III) and Eu(III)] doped samples were produced and the high absorption capacity of RE ions in this structure was confirmed due to the manifestation of luminescence of these saturated systems. Moreover, the optical properties of samples doped with Eu(III) showed to be useful to evaluate the occupation of dopant in the Zn7Sb2O12 structure. Thus, the main objective of this study was to use the Zn7Sb2O12 as a host lattice for Eu(III), Pr(III) and Ce(III) as doping ions, the study of their structural and spectroscopic characteristics and the investigation of its potential as a scintillator material. As a secondary objective, we tried to fabricate a fiber from the polycrystalline powder material containing 9% of Eu(III) using the technique of laser floating zone (LFZ). Structural analysis of the studied systems confirmed the formation of Zn7Sb2O12 α-phase and it was also identified a small fraction of the Zn7Sb2O12 β-phase and the Zincita ZnO phase, whose variation was associated with the type of dopant ion. IR spectroscopy data confirmed that the occupation of the semiconductor dopants in the network is not substitutional in relation to Sb(V) or Zn(II) sites. Thus, from the luminescence spectroscopy, the various non-substitutional sites were investigated using both UV-VIS and X-ray excitation sources. In the case of the system containing Eu(III) it was observed that under X-ray excitation all sites emit, that are associated with an intrinsic optical mechanism of the defects generated in the system under that ionizing radiation, while the UVVIS... (Complete abstract click electronic access below)
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Silva, Andreza Cristina Souza. "'ZN IND.7'SB IND. 2'O IND. 12' contendo Ce(III), Pr(III) ou Eu(III) : investigação de suas propriedades estruturais e ópticas para potencial aplicação como cintilador /." Araraquara : [s.n.], 2012. http://hdl.handle.net/11449/97923.
Full textAbstract:
Resumo: A matriz estudada é uma cerâmica a base de Zn7Sb2O12, que possui estrutura do tipo espinélio inverso. A dopagem desta cerâmica com íons TR gera materiais com propriedades diferentes das da fase original que podem apresentar melhor desempenho. Estudos preliminares, onde foram feitas dopagens do tipo Zn7-3xTR2xSb2O12 [TR = Ce(III), Pr(III) e Eu(III)], confirmaram a alta capacidade de absorção dos íons TR nesta estrutura pela manifestação de luminescência destes sistemas saturados. Ademais, as propriedades ópticas das amostras dopadas com Eu(III) auxiliaram na avaliação da ocupação dos íons dopantes na estrutura do Zn7Sb2O12. Assim, o principal objetivo deste trabalho foi a utilização da matriz Zn7Sb2O12 como estrutura hospedeira dos dopantes Eu(III), Pr(III) e Ce(III), estudando suas características estruturais e espectroscópicas e investigando suas potencialidades como material cintilador. Como objetivo secundário, tentou-se confeccionar uma fibra policristalina a partir do material em pó contendo 9% de Eu(III), através da técnica de fusão de zona com laser. A análise estrutural dos sistemas estudados confirmou a formação da fase α-Zn7Sb2O12 e pôde-se identificar uma pequena fração das fases β-Zn7Sb2O12 e Zincita de ZnO, cuja variação foi associada ao tipo do íon dopante. Dados de espectroscopia no IV confirmaram que a ocupação dos dopantes na rede do semicondutor não é substitucional aos sítios de Sb(V) ou Zn(II). Desta forma, a partir da espectroscopia de luminescência, os diversos sítios não substitucionais foram investigados utilizando tanto excitação UV-VIS quanto raios X. No caso do sistema contendo Eu(III) observou-se que, sob excitação via raios X, todos os sítios emitem por meio de um mecanismo... (Resumo completo, clicar acesso eletrônico abaixo)Abstract: The matrix studied is a ceramic based on Zn7Sb2O12 with inverse spinel type structure. The doping of this ceramic with RE ions generates materials with different properties from the original phase that can perform better. In preliminary studies the Zn7-3xRE2xSb2O12 [RE = Ce(III), Pr(III) and Eu(III)] doped samples were produced and the high absorption capacity of RE ions in this structure was confirmed due to the manifestation of luminescence of these saturated systems. Moreover, the optical properties of samples doped with Eu(III) showed to be useful to evaluate the occupation of dopant in the Zn7Sb2O12 structure. Thus, the main objective of this study was to use the Zn7Sb2O12 as a host lattice for Eu(III), Pr(III) and Ce(III) as doping ions, the study of their structural and spectroscopic characteristics and the investigation of its potential as a scintillator material. As a secondary objective, we tried to fabricate a fiber from the polycrystalline powder material containing 9% of Eu(III) using the technique of laser floating zone (LFZ). Structural analysis of the studied systems confirmed the formation of Zn7Sb2O12 α-phase and it was also identified a small fraction of the Zn7Sb2O12 β-phase and the Zincita ZnO phase, whose variation was associated with the type of dopant ion. IR spectroscopy data confirmed that the occupation of the semiconductor dopants in the network is not substitutional in relation to Sb(V) or Zn(II) sites. Thus, from the luminescence spectroscopy, the various non-substitutional sites were investigated using both UV-VIS and X-ray excitation sources. In the case of the system containing Eu(III) it was observed that under X-ray excitation all sites emit, that are associated with an intrinsic optical mechanism of the defects generated in the system under that ionizing radiation, while the UVVIS... (Complete abstract click electronic access below)
Orientador: Ana Maria Pires
Coorientador: Marian Rosaly Davolos
Banca: Silvania Lanfredi
Banca: Marco Antonio Utrera Martines
Mestre
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Pereira, Fernanda Antonia. "Estudo da interação do As(III) com modelo "zinc finger" da proteína NCp7 HIV-1 e complexos de Bi(III) e Sb(III) com ligantes contendo 2-mercapto-imidazol." Universidade Federal de Minas Gerais, 2010. http://hdl.handle.net/1843/SFSA-8DFJ9Z.
Full textAbstract:
The ejection of zinc from its coordination site in Zn-finger protein can be promoted by other metal species through competitive binding. This is considered as a promising strategy to inactivate the Zn-finger protein and for the design of new and more efficient drugs. A study of the As(III) interaction with the CCHC zinc finger domain of the NCp7 protein of HIV-1 has been carried out using the fluorescence and circular dichroism spectroscopies. This study allowed a better understanding of the ability of As(III) to promote Zn ejection and brought new insights into the role of glutathione as a biomolecule that can facilitate the ejection of Zn. The exactly mechanism is not yet known, but the fluorescence and circular dichroism data shows the importance of the participation of glutathione in the system formed. The competition between As(III) and Zn(II) was evaluated in phosphate buffers of different pHs. Sb(III) and Bi(III) compounds with 2-mercapto-imidazole- and
-mercapto-benzimidazole-type ligands have been synthesized. These complexes involve coordination of the metal specie with the S-atom from thiol group and the N-atom from imidazole, just like occurs in the zinc finger domains. Five new complexes, SbCl(Bzmiz)2.CH3OH, BiCl(Bzmiz).CH3OH, BiCl2(Bzmiz).2H2O, SbCl2(Miz) and BiCl2(Miz) were successfully obtained. Physico-chemical characterization was performed using NMR, FTIR and UV-vis spectroscopies, elementar analyses, conductimetric analyses and thermogravimetric analyses. Four crystals were also obtained from these complexes, except for the SbCl2(Miz) complex. X-Ray diffraction analyses of these crystals are in course.A ejeção do zinco promovida pela sua competição com outra espécie metálica pelo sítio de coordenação da proteína é tida como uma estratégia de inativação da proteína podendo possivelmente ser aplicada para síntese de novos fármacos mais eficazes. O estudo da interação do As(III) com modelo de peptídeo dedo de zinco CCHC da proteína NCp7 de HIV-1 foi realizado utilizando-se as técnicas espectroscópicas de fluorescência e dicroísmo circular. Esse estudo permitiu uma melhor compreensão sobre a habilidade do As(III) de promover a ejeção do Zn e o papel da glutationa como biomolécula facilitadora na ejeção do zinco. O exato mecanismo ainda não é conhecido, mas os dados de fluorescência e dicroísmo circular obtidos nos mostraram a importância da participação da glutationa no sistema formado. A competição entre As(III) e Zn(II) foi avaliada em diferentes pHs em tampão fosfato. Foram sintetizados compostos de Sb(III) e Bi(III) com os ligantes 2-mercapto-imidazol e 2-mercapto-benzimidazol. Os complexos envolvendo tais ligantes conservam como característica a coordenação da espécie metálica com S de grupo tiol e N de imidazol, assim como ocorre em domínios dedos de zinco. Obtivemos como resultados das sínteses, cinco complexos inéditos, bCl(Bzmiz)2.CH3OH, BiCl(Bzmiz).CH3OH, BiCl2(Bzmiz).2H2O, SbCl2(Miz) e BiCl2(Miz). A caracterização físico-química desses complexos foi feita por RMN, espectroscopias FTIR e UV-Vis, análises elementar (CHN), condutimetria e termogravimetria. Foram obtidos cristais de quatro dos cinco compostos sintetizados, não obtendo cristais apenas para o complexo SbCl2(Miz). Estudos de difração de raios X estão em andamento.
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Mohammad, Rezek Mahmoud Salim. "The Electronic Band Structure Of Iii (in, Al, Ga)-v (n, As, Sb) Compounds And Ternary Alloys." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606292/index.pdf.
Full textAbstract:
In this work, the electronic band structure of III (In, Al, Ga) - V (N, As, Sb)
compounds and their ternary alloys have been investigated by density functional
theory (DFT) within generalized gradient approximation (GGA) and empirical
tight binding (ETB) calculations, respectively.
The present DFT-GGA calculations have shown direct band gap structures
in zinc-blende phase for InN, InAs, InSb, GaN, and GaAs. However, indirect
band gap structures have been obtained for cubic AlN, AlSb and AlAs com-
poundshere, the conduction band minima of both AlN and AlAs are located at X symmetry point, while that of AlSb is at a position lying along Gamma- X direction. An important part of this work consists of ETB calculations which have been parameterized for sp3d2 basis and nearest neighbor interactions to study the band gap bowing of III(In
Al)- V(N
As
Sb) ternary alloys. This ETB model provides a satisfactory electronic properties of alloys within reasonable calculation time compared to the calculations of DFT. Since the present ETB energy parameters reproduce successfully the band structures of the compounds at ¡
and X symme- try points, they are considered reliable for the band gap bowing calculations of the ternary alloys. In the present work, the band gap engineering of InNxAs1¡
x, InNxSb1¡
x, InAsxSb1¡
x, Al1¡
xInxN, Al1¡
xInxSb and Al1¡
xInxAs alloys has been studied for total range of constituents (0 <
x <
1). The downward band gap bowing seems the largest in InNxAs1¡
x alloys among the alloys considered in this work. A metallic character of InNxAs1¡
x, InNxSb1¡
x and InAsxSb1¡
x has been ob- tained in the present calculations for certain concentration range of constituents (N
As) as predicted in the literature. Even for a small amount of contents (x), a decrease of the electronic e®
ective mass around ¡
symmetry point appears for InNxAs1-x, InNxSb1-x and InAsxSb1-x alloys manifesting itself by an increase of the band curvature. The calculated cross over from indirect to direct band gap of ternary Al alloys has been found to be consistent with the measurements. As a last summary, the determinations of the band gaps of alloys as a function of contents, the concentration range of con- stituents leading to metallic character of the alloys, the change of the electronic effective mass around the Brillioun zone center (Gamma) as a function of alloy contents, the cross over from indirect to direct band gap of the alloys which are direct on one end, indirect on the other end, are main achievements in this work, indispensable for the development of mate- rials leading to new modern circuit components.
Books on the topic "III-Sb"
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Cheng, Russell. The Pearson and Johnson Systems. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198505044.003.0009.
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This chapter re-examines two of the best-known systems of parametric distributions: the Pearson and the Johnson. It is shown that, in the Pearson system, Pearson Types III and V are boundary embedded models of the main Types I, IV, and VI. A comprehensive way of finding the best type to fit is given using appropriate score statistics to guide a systematic search of all model types, including symmetric boundary models. Maximum likelihood estimation is used and details of its numerical implementation are given. Type IV can be a difficult model to fit. A method is discussed for this model that is reasonably robust, subject to certain restrictions on the parameter values. The same examination is made of the Johnson system where the lognormal, SL family is shown to be an embedded subsystem of both the main subsystems SB and SU. Two real data examples are given.
Book chapters on the topic "III-Sb"
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Esser, N., and E. Speiser. "Sb monolayer-terminated III–V(110) surfaces." In Physics of Solid Surfaces, 572–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53908-8_137.
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Rattunde, M., J. Schmitz, C. Mermelstein, R. Kiefer, and J. Wagner. "III-Sb-based Type-I QW Diode Lasers." In Mid-infrared Semiconductor Optoelectronics, 131–57. London: Springer London, 2006. http://dx.doi.org/10.1007/1-84628-209-8_3.
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Sawyer, Jeffery F., and Ronald J. Gillespie. "The Stereochemistry of Sb(III) Halides and Some Related Compounds." In Progress in Inorganic Chemistry, 65–113. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470166352.ch2.
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Aiken, Lewis R. "Individual Testing of School-Age Children I: SB-IV and WISC-III." In Assessment of Intellectual Functioning, 83–116. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4757-9304-8_4.
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Duke, C. B., C. Mailhiot, A. Paton, K. Li, C. Bonapace, and A. Kahn. "Atomic and Electronic Structure of p (1 × 1) Overlayers of Sb on the (110) Surfaces of III-V Semiconductors." In The Structure of Surfaces, 317–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82493-7_51.
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Villars, P., K. Cenzual, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, I. Savysyuk, and R. Zaremba. "Ni9(Bi,Sb)2S8." In Landolt-Börnstein - Group III Condensed Matter, 837. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22847-6_720.
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Villars, P., K. Cenzual, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, I. Savysyuk, and R. Zaremba. "(Fe,Zn)20(Sb,As)16O48S4." In Landolt-Börnstein - Group III Condensed Matter, 61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22847-6_16.
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Wang, Yong Qing, Jian Qing Wu, and Jianer Zhou. "Antistatic Ceramic Tiles Modified by Sb-Doped SnO2." In High-Performance Ceramics III, 279–80. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.279.
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Zhou, Min, Li Dong Chen, Chu De Feng, and Xiang Yang Huang. "Synthesis and Electrical Transport Properties of TiCo1-xPdxSb Half-Heusler Compounds." In High-Performance Ceramics III, 405–8. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-959-8.405.
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Gershman, Evgeny, and Sergey Zhevnenko. "Isothermes of Surface and Grain Boundary Tension of Cu-Based Alloys with Sb, Sn, In." In Diffusion in Solids and Liquids III, 608–15. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908451-51-5.608.
Full textConference papers on the topic "III-Sb"
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Jagupilla, S. C., D. G. Grubb, and M. Wazne. "Immobilization of Sb(III) and Sb(V) Using Steel Slag Fines." In GeoCongress 2012. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412121.409.
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Feihui Li and Wei Wang. "Electrochemical reduction process of Sb(III) on Au substrate." In 2007 26th International Conference on Thermoelectrics (ICT 2007). IEEE, 2007. http://dx.doi.org/10.1109/ict.2007.4569509.
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Greene, Andrew, Shailesh Madisetti, Michael Yakimov, Vadim Tokranov, and Serge Oktyabrsky. "Development of III-Sb Technology for p-Channel MOSFETs." In Selected Papers from the Workshop on Frontiers in Electronics 2013 (WOFE-13). WORLD SCIENTIFIC, 2014. http://dx.doi.org/10.1142/9789814656917_0002.
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Jamaluddin, Nur Amirah, and Ibrahim Baba. "Synthesis and structural characterization of new dithiocarbamate complexes from Sb(III) and Bi(III)." In THE 2013 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2013 Postgraduate Colloquium. AIP Publishing LLC, 2013. http://dx.doi.org/10.1063/1.4858751.
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Huffaker, D. L., G. Balakrishnan, M. Mehta, M. N. Kutty, P. Rotella, S. Krishna, and L. R. Dawson. "Monolithically Integrated III-Sb Superluminescent Light Emitting Diodes on Si (100) Substrates." In CLEO 2007. IEEE, 2007. http://dx.doi.org/10.1109/cleo.2007.4452988.
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Mermelstein, Carmen, M. Rattunde, J. Schmitz, Rudolf Kiefer, Martin Walther, and Joachim Wagner. "Physics and applications of III-Sb-based type-I QW diode lasers." In Symposium on Integrated Optoelectronic Devices, edited by Jerry R. Meyer and Claire F. Gmachl. SPIE, 2002. http://dx.doi.org/10.1117/12.467945.
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Tatebayashi, J., A. Jallipalli, M. N. Kutty, S. H. Huang, N. Nuntawong, G. Balakrishnan, L. R. Dawson, and D. L. Huffaker. "Monolithically integrated III-Sb based laser diodes grown on miscut Si substrates." In Integrated Optoelectronic Devices 2008, edited by Alexey A. Belyanin and Peter M. Smowton. SPIE, 2008. http://dx.doi.org/10.1117/12.775340.
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Huffaker, D. L., G. Balakrishnan, A. Jallipalli, M. N. Kutty, S. H. Huang, and L. R. Dawson. "Monolithically integrated III-Sb diode lasers on Si using interfacial misfit arrays." In Optics East 2007, edited by Achyut K. Dutta, Yasutake Ohishi, Niloy K. Dutta, and Andrei V. Lavrinenko. SPIE, 2007. http://dx.doi.org/10.1117/12.737224.
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Zheng, Limin. "LOCA Event Tree Analysis for Qinshan Phase III CANDU-6 PHWR NPP." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29746.
Full textAbstract:
Qinshan Phase III is the first commercial pressurized heavy water reactor (PHWR) NPP in China, and it uses CANDU-6 design developed by AECL. Based on plant design and operation experience, the event tree analysis model has been developed for both small break LOCA (SB-LOCA) and large break LOCA (LB-LOCA), which is an important aspect of operational Probabilistic Safety Assessment (PSA). Both SB-LOCA and LB-LOCA event tree analysis have been performed for Qinshan Phase III CANDU-6 PHWR NPP (TQNPC). And the event sequence development and plant damage status (PDS) were provided in the analysis. It reflects actual plant configuration and response under a certain event, and various break type and locations were also considered in the event tree analysis, e.g. Pressure Tube Rupture, Pressure Tube and Calandria Tube Rupture, Feeder Breaks, Pressurizer Relief/Steam Bleed Valves Fail Open, Liquid Relief Valves Fail Open, etc.
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Ahirwar, P., D. Shima, T. J. Rotter, S. P. R. Clark, S. J. Addamane, C. P. Hains, L. R. Dawson, et al. "TEM based analysis of III-Sb VECSELs on GaAs substrates for improved laser performance." In SPIE LASE, edited by Jennifer E. Hastie. SPIE, 2013. http://dx.doi.org/10.1117/12.2005301.
Full textReports on the topic "III-Sb"
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Haige, Ralf, Ashwani Vij, Jerry Boatz, Stefan Schneider, and Thorsten Schroer. First Structural Characterization of Binary As(III) and Sb(III) Azides. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada417695.
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Huffaker, Diana, Seth Hubbard, and Andrew Norman. Development of III-Sb Quantum Dot Systems for High Efficiency Intermediate Band Solar Cells. Office of Scientific and Technical Information (OSTI), July 2015. http://dx.doi.org/10.2172/1347995.
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