Bibliografias temáticas / Ligand imine

Literatura científica selecionada sobre o tema "Ligand imine"

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Publicado: 13 de julho de 2024

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Artigos de revistas sobre o assunto "Ligand imine"

Hou, Lulu, Hongyu Ren e Baoli Guo. "Research progress of pre-transition metal olefin polymerization catalyst for salicylaldehyde imine". Journal of Polymer Science and Engineering 5, n.º 1 (8 de agosto de 2018): 281. http://dx.doi.org/10.24294/jpse.v5i1.281.

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Salicylaldehyde imine transition metal catalyst is a kind of olefin polymerization catalyst that is widely used in the coordination of salicylaldehyde imine ligand and pre-transition metal. Salicylaldehyde imine ligands have the characteristic of easily inserting diﬀerent substituents via organic synthesis. Therefore, the regulation of the polymerization activity, polymerization product, and product distribution can be achieved by changing the steric hindrance eﬀect, the electronic eﬀect, and the number of metal active sites near the catalytic active center. The development status of the transition metal catalyst of salicylaldehyde imide was summarized in this paper. The influence of the ligand structure of the salicylaldehyde imide transition metal catalyst on the catalytic performance, which involved the high selectivity of ethylene trimerization, ethylene/α-olefin, polar monomer copolymerization, ethylene polymerization production, ultra-high molecular weight polyethylene, and many other areas of olefin polymerization, was elaborated, providing references for further study and industrial applications of this catalyst.

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Khatua, Manas, Bappaditya Goswami e Subhas Samanta. "Dehydrogenation of amines in aryl-amine functionalized pincer-like nitrogen-donor redox non-innocent ligands via ligand reduction on a Ni(ii) template". Dalton Transactions 49, n.º 20 (2020): 6816–31. http://dx.doi.org/10.1039/d0dt00466a.

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Ferraz de Paiva, Raphael Enoque, Douglas Hideki Nakahata, Marcos Alberto de Carvalho, Fernando Rodrigues Goulart Bergamini e Pedro Paulo Corbi. "N,N′,N′′versus N,N′,Oimine-containing coordination motifs: ligand-directed synthesis of mononuclear and binuclear CuIIcompounds". Acta Crystallographica Section E Crystallographic Communications 73, n.º 10 (29 de setembro de 2017): 1563–67. http://dx.doi.org/10.1107/s2056989017013652.

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It is demonstrated here that tridentate imine ligands can control the nuclearity of copper(II) complexes based on the donor atoms present in the ligand. TheN,N′,N′′-donating imine ligand led to a mononuclear compound, namely dichlorido[N,N-dimethyl-N′-(pyridin-2-ylmethylidene)ethane-1,2-diamine]copper(II) monohydrate, [CuCl2(C10H15N3)]·H2O,1, while theN,N′,O-donating imine ligand produced a binuclear metal complex, namely μ2-chlorido-dichlorido(μ2-2-{[2-(dimethylamino)ethyl]iminomethyl}phenolato)(N,N-dimethylethylenediamine)dicopper(II) 0.11-hydrate, [Cu2(C11H15N2O)Cl3(C4H12N2)]·0.11H2O,2. The structure of2is a remarkable example of a binuclear copper(II) complex containing a single substituted 2-iminomethylphenolate ligand that has two copper(II) sites in square-pyramidal coordination.

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Bernhard, P., DJ Bull, WT Robinson e AM Sargeson. "The Synthesis and Properties of an Encapsulated Ruthenium(II) Ion by an N3S3 Macrobicyclic Ligand". Australian Journal of Chemistry 45, n.º 8 (1992): 1241. http://dx.doi.org/10.1071/ch9921241.

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The complex [ Ru(capten)]2+ ( capten = 1-methyl-3,13,16-trithia-6,10,19-triazabicyclo[6.6.6]- icosane ) has been synthesized from [ Ru ( dmf )6]2+ ( dmf = N,N- dimethylformamide ) and the free ligand . An X-ray crystallographic analysis of [ Ru ( capten )] (CF3SO3)2 at 138 K reveals a lel3 conformation of the ligand with an average II-N bond length of 2.136(5) � and an average RuII-S bond length of 2.284(8) � . Visible spectra and the redox potential (1.26 V v. n.h.e .) show that the RuII state is stabilized by c. 0.9 V relative to the complex with six nitrogen donor atoms. Oxidation of Ru11 to RuIIIin acetonitrile leads to dehydrogenation of the ligand to form an imine. Successive oxidations lead to a triimine species where all the imines are located in the ligand cap. These oxidation processes are inferred to take place through RuIV intermediates which decay by intramolecular 2e- steps to the imine.

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Eliseev, Ivan I., Nadezhda A. Bokach, Matti Haukka e Irina A. Golenya. "cis-Dichlorido(dimethyl sulfoxide-κS)(N,N,N′,N′-tetramethylguanidine-κN′′)platinum(II)". Acta Crystallographica Section E Structure Reports Online 69, n.º 2 (19 de janeiro de 2013): m117—m118. http://dx.doi.org/10.1107/s160053681300130x.

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In the title compound,cis-[PtCl2(C5H13N3)(C2H6OS)], the four-coordinate PtIIatom is bonded to one N atom of theN,N,N′,N′-tetramethylguanidine ligand, one dimethyl sulfoxide S atom and two chloride ligands, forming acis-square-planar geometry. The bond lengths and angles of the N—Pt—Cl functionality are typical for imine dichloridoplatinum(II) complexes. The H atom of the imino group is oriented towards the O atom of the sulfoxide group of a neighboring molecule and forms an N—H...O hydrogen bond.

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Adeleke, Adesola A., Sizwe J. Zamisa e Bernard Omondi. "Ag(I) Complexes of Imine Derivatives of Unexpected 2-Thiophenemethylamine Homo-Coupling and Bis-(E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine". Molbank 2021, n.º 2 (12 de junho de 2021): M1235. http://dx.doi.org/10.3390/m1235.

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Imines are fundamental organic compounds used as synthetic intermediates and as ligands in coordination chemistry. They are also found to be important pharmacophores in various bioactive compounds. In this report, two Schiff bases were prepared using the traditional condensation of 4-pyridinecarboxaldehyde with 2-thiophenemethylamine and 2-quinolinecarboxaldehyde with furfurylamine to form (E)-1-(pyridin-4-yl)-N-(thiophen-2-ylmethyl)methanimine (L1) and (E)-N-(furan-2-ylmethyl)-1-(quinolin-2-yl)methanimine (L2) respectively. L1 and L2 were complexed with silver perchlorate in 2:1 [M:L] stoichiometry to obtain complexes 1 and 2, respectively. The crystal structures of 1 and 2 were unequivocally determined by single-crystal X-ray diffraction analysis. The resulting structures revealed 2 to be a four-coordinate as expected. In contrast, an unexpected chemoselective hydrolytic cleavage of one mole of the (CH=N) imine ligands occurred in complex 2 and, further, the amines (thiophenemethylamine) homo-coupled to form a new imine ligand derivative in situ (L1a) before coordinating to the Ag(I) center along with L1. This observation described an alternative synthetic route to be explored to synthesize a diverse range of imine derivatives, which involves the Ag(I)-promoted homo-coupling of amines. Herein, the crystal structures of Ag(I) complexes of pyridinyl [Ag(L1)(L1a)]ClO4 (1) and quinolinyl [Ag(L2)2]ClO4 (2) Schiff bases are presented.

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Khalaf, Mai M., Hany M. Abd El-Lateef, Abdulrahman Alhadhrami, Fatma N. Sayed, Gehad G. Mohamed, Mohamed Gouda, Saad Shaaban e Ahmed M. Abu-Dief. "Synthesis, Spectroscopic, Structural and Molecular Docking Studies of Some New Nano-Sized Ferrocene-Based Imine Chelates as Antimicrobial and Anticancer Agents". Materials 15, n.º 10 (20 de maio de 2022): 3678. http://dx.doi.org/10.3390/ma15103678.

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The newly synthesized organometallic acetyl ferrocene imine ligand (HL) was obtained by the direct combination of 2-acetyl ferrocene with 2-aminothiophenol. The electronic and molecular structure of acetyl ferrocene imine ligand (HL) was refined theoretically and the chemical quantum factors were computed. Complexes of the acetyl ferrocene imine ligand with metal(II)/(III) ions (Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II)) were fabricated. They were inspected by thermal (DTG /TG), spectroscopic techniques (FT-IR, 1H NMR, mass, UV–Vis), molar conductivity, and CHNClM to explicate their structures. Studies using scanning electron microscope (SEM) were conducted on the free acetyl ferrocene imine ligand and its Cd(II) chelate to confirm their nano-structure. To collect an idea about the effect of metal ions on anti-pathogenic properties upon chelation, the newly synthesized acetyl ferrocene imine ligand and some of its metal chelates were tested against a variety of microorganisms, including Bacillus subtilis, Staphylococcus aureus, Salmonella typhimurium, Escherichia coli, Aspergillus fumigatus, and Candida albicans. The ligand and its metal chelate were tested for cytotoxic activity in human cancer (MCF-7 cell viability) and human melanocyte cell line HBF4. It was discovered that the Cd(II) chelate had the lowest IC50 of the three and thus had the prior activity. Molecular docking was utilized to investigate the interaction of acetyl ferrocene imine ligand (HL) with the receptors of the vascular endothelial growth factor receptor VEGFR (PDB ID: 1Y6a), human Topo IIA-bound G-segment DNA crystal structure (PDB ID: 2RGR), and Escherichia coli crystal structure (PDB ID: 3T88).

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Zabłocka, Maria, Alain Igau, Victorio Cadierno, Marek Koprowski e Jean-Pierre Majoral. "α-Phosphino-Imine Ligand Design". Phosphorus, Sulfur, and Silicon and the Related Elements 177, n.º 8-9 (agosto de 2002): 1965. http://dx.doi.org/10.1080/10426500213421.

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Zabierowski, Piotr, Janusz Szklarzewicz e Wojciech Nitek. "Disentangling steric and electronic factors in monomeric bis(2-bromo-4-chloro-6-{[(2-hydroxyethyl)imino]methyl}phenolato-κ2N,O)copper(II)". Acta Crystallographica Section C Structural Chemistry 70, n.º 7 (6 de junho de 2014): 659–61. http://dx.doi.org/10.1107/s2053229614012273.

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The title compound, [Cu(C9H8BrClNO2)2], is a square-planar complex. The potentially tridentate dibasic 2-bromo-4-chloro-6-{[(2-hydroxyethyl)imino]methyl}phenolate ligand coordinates in atrans-bis fashion to the CuIIcentreviathe imine N and phenolate O atoms. The CuIIatom lies on the centre of inversion of the molecule. The potentially coordinating hydroxyethyl group remains protonated and uncoordinated, taking part in intermolecular hydrogen bonds with vicinal groups, leading to the formation of a two-dimensional hydrogen-bond network with sheets parallel to the (10\overline{1}) plane. Substituent effects on the crystal packing and coordination modes of the ligand are discussed.

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Li, Mingyuan, Hu Zhang, Zhengguo Cai e Moris S. Eisen. "Norbornene polymerization and copolymerization with 1-alkenes by neutral palladium complexes bearing aryloxide imidazolin-2-imine ligand". Polymer Chemistry 10, n.º 21 (2019): 2741–48. http://dx.doi.org/10.1039/c9py00176j.

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Teses / dissertações sobre o assunto "Ligand imine"

Holub, Jan. "Generation of coordination architectures from dynamic covalent ligand libraries". Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAF060/document.

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La Chimie Dynamique Combinatoire basée sur les liaisions imines (-C=N-), avec l’aide de la chimie de coordination, donne accès à différentes types d’architectures metallosupramoléculaires et de réseaux dynamiques fonctionnels. Le travail effectué au cours de cette thèse traite de ces deux aspects. Dans un premier temps des structures de types grilles moléculaire et de type hélicate ont été synthétisés, à l’aide de métaux donnant une coordination octahédrale ou tétraédrale, et leurs propriétés dans un environnement dynamique ont été étudiées. Dans un deuxième temps des réseaux dynamiques, présentant des relations agoniste/antagoniste à travers l’échange des constituants aldéhydes et amines/hydrazines réseau, ont été étudiés. Ces systèmes permettent, à travers l’amplification d’un ou plusieurs constituants, une rééquilibration du réseau permettant l’implémentation de fonction tel que l’apprentissage et la prise de décision pour ces systèmes chimiques adaptifs. Un nouveau système, est présenté et étudié ici, permettant une redistribution stable même après le retrait du stimuli métallique (ajout/retrait d’un métal), permettant à ce système de réaliser un processing d’information : apprentissage, stockage, rappel et effacement
Dynamic Combinatorial Chemistry of imine-based dynamic covalent bonds (-C=N-), under the governance of coordination chemistry, can lead to different metallosupramolecular architectures and responsive functional systems. In this work these two aspects have been approached. Grids and helicates architectures based on aldehydes and amines/hydrazines backbones have been synthesised, in order to probe their behaviour in a dynamic network environment, using both octahedral and tetrahedral coordinating metal cations. Dynamic systems can be also represented by dynamic networks that define agonistic and antagonistic relationships between different constituents linked through component exchange. These networks can be switched through amplification of the best fittest constituent(s) in a dynamic set, allowing to access higher level functions such as training, learning, and decision making for adaptive chemical systems. A novel multi responsive system, able to be trained for information storage, has been studied, exhibiting a stable distribution even after removal of the metal stimuli, making this system able to perform information processing operations: training, storage, recall, and erase

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Prema, Dipesh. "Different coordination modes of bis(imine-ridine) and bis(quinaldine) ligands". Diss., Manhattan, Kan. : Kansas State University, 2007. http://hdl.handle.net/2097/267.

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Barner, Claudia Jane. "Part I. Coordination chemistry of high-valent osmium polyanionic chelating ligand complexes with imine, imido and nitrido ligands. : Part II. Asymmetric hydrogenation using a resolved chiral scandium hydride complex /". Diss., Pasadena, Calif. : California Institute of Technology, 1990. http://resolver.caltech.edu/CaltechETD:etd-06112007-095040.

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Magee, Chad Leroy Keller S. W. "The synthesis and characterization of 1,1'-disubstituted ferrocene imine Schiff base ligand systems for use as potential environmental heavy metal cationic sensors". Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/7117.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb. 23, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dr. Steven W. Keller, Dissertation Supervisor. Vita. Includes bibliographical references.

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Gunler, Zeynep Inci. "Synthesis Of N-(2-propylphenyl) Substituted Chiral Amino Alcohols And Their Usage In Enantioselective Diethylzinc Addition Reactions". Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613001/index.pdf.

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Chiral 1,2-amino alcohols were synthesized via newly developed &ldquo
intramolecular unsaturation transfer&rdquo
using cyclohexanone, propargyl bromide, and various chiral amino alcohols as starting components. These amino alcohols can be potential chiral ligands for many asymmetric transformation reactions. Therefore, their effectiveness as chiral ligands in diethylzinc addition to benzaldehyde and N-diphenylphosphinoyl imines were tested. Various parameters including temperature, solvent, ligand amount etc. were screened for the synthesized chiral ligands. In diethylzinc addition to benzaldehyde high enantioselectivity could not be obtained. When N-diphenylphosphinoyl imines were used as substrate good ee values up to 80% were achieved.

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Pierre, Fabrice. "Synthese et reduction electrochimique de complexes (#5-cyclopentadienyl) (#6-arene) fer(ii)pf#6 porteurs d'une fonction imine ou nitrone en position benzylique du ligand arene". Rennes 1, 1997. https://tel.archives-ouvertes.fr/tel-00343810.

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Ce memoire rapporte une etude de fonctionnalisation de complexes (cp fe arene)#+, dans un cadre fondamental d'activation de liaison c-h benzylique par les metaux de transition. La condensation entre le (cp fe diphenylmethane)#+ et le nitrosobenzene ou les nitrosotoluenes, initiee par 5% de t-buok, conduit a des melanges de complexes (cp fe benzophenone-n-arylnitrones)#+ et (cp fe benzophenone-anils)#+ (env. 80:20) avec de bons rendements (80-92%. Les complexes nitrones sont obtenus purs par recristallisation fractionnee (rdt. 22-35%). La condensation de nitrosoarenes varies r-ph-no (r = h, 2-me, 3-me, 4-me, 2-cl, 4-cl, 2-ch#2co#2me, 3-come, 4-come, 4-nme#2) sur le complexe (cp fe fluorene)#+ donne exclusivement des cations imines (cp fe fluorenone-anil)#+ (rdt. 57-95%), isoles a l'etat de melanges syn-anti (env. 30:70). La meme reaction avec l'o-nitrosobenzoate de methyle fournit un melange imine-nitrone (60:40). En raison du caractere oxydant eleve du nitrosobenzene, nous n'avons pu le condenser sur d'autres cations (cp fe arene)#+ (arene = toluene, ethylbenzene, indane, tetraline et 9,10-dihydroanthrancene). L'hydrolyse acide de ces cations imines et nitrones a ete abordee d'un point de vue cinetique par polarographie. L'hydrolyse a l'echelle preparative permet d'obtenir les complexes (cp fe benzophenone)#+ et (cp fe fluorenone)#+ avec de bons rendements (respectivement 91 et 82%). La reduction electrochimique en milieu hydro-organique basique des melanges de (cp fe benzophenone-n-arylnitrones)#+ et (cp fe benzophenone-anils)#+ permet de synthetiser les amines correspondantes (cp fe--(arylamino)diphenylmethane)#+ avec de bons rendements (85-90%). Les cations (cp fe-9-(arylamino)fluorene)#+ sont obtenus de la meme maniere (rdt. 70-88%) en milieu hydro-organique acide, a partir des derives correspondants (cp fe -fluorenone anil)#+ ou la nitrone (cp fe fluorenone-n-(2'-methoxycarbonyl phenyl)nitrone)#+. D'apres l'etude des deplacements chimiques en rmn #1h, l'isometre exo est forme majoritairement pendant l'electrosynthese des complexes 9-(arylamino) fluorenes (exo:endo env. 75:25). Nous expliquons ce resultat inattendu par une epimerisation endo exo subsequente a la reduction. Ces complexes amines sont reoxydes par o#2 en imine de depart dans des conditions douces (catalyse par al#2o#3).

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Tanh, Jeazet Harold Brice. "Metallo-supramolecular Architectures based on Multifunctional N-Donor Ligands". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-39665.

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Self-assembly processes were used to construct supramolecular architectures based on metal-ligand interactions. The structures formed strongly depend on the used metal ion, the ligand type, the chosen counter ion and solvent as well as on the experimental conditions. The focus of the studies was the design of multifunctional N-donor ligands and the characterization of their complexing and structural properties. This work was divided into three distinct main parts: The bis(2-pyridylimine), the bis(2-hydroxyaryl) imine and the tripodal imine / amine ligand approach. In the first part a series of bis(2-pyridylimine) derivatives having different linking elements were employed as building blocks for novel supramolecular architectures. Reaction of individual d-block metal salts with these ligands has led to the isolation of coordination polymers, a metallamacrocycle, double-stranded helicates, triple-stranded helicates as well as of circular meso-helicates. The nature of the spacer in the Schiff base ligands, the noncovalent weak interactions, such as hydrogen bond, face-to-face π-π and edge-to-face CH-π interactions, are all important factors influencing the architecture of the final products. Topological control of the assembly process of the hexanuclear meso-helicates is clearly associated with the bidentate coordination of the sulfate anion which directs the formation of a double- rather than a triple-stranded helicate around the octahedrally coordinated Cu(II). Surprisingly, the variation of the linker function in the ligands, which significantly changes the linking angle of the pyridylimine strands, has only a little influence of the resulting structure. Also the use of a mixture of ligands does not influence the meso-helicate topology; the result is the symmetrically mixed meso-helicate. The new iron(II) triple helicate [Fe2(L5)3](PF6)4 14 {L5 = bis[4-(2-pyridylmethyleneimino)phenyl]-1,1-cyclohexane} in its chloride form binds strongly to DNA as confirmed by induced circular dichroism signals in both the metal-to-ligand charge transfer (MLCT) and in-ligand bands of the helicate. The induced CD spectrum gives some evidence that [Fe2(L5)3]4+ interacts with the DNA in a single binding mode, which is consistent with major groove binding. The cytotoxicity of the new iron(II) triple helicate 14 was evaluated on human lung cancer A549 cells and compared with that of cisplatin and that of the previously reported iron(II) triple helicate [Fe2(L1)3]4+{L1 = bis[4-(2-pyridylmethyleneimino)phenyl]methane}. The first results show some distinguishing features for 14 obviously caused by the existing structural differences of the complexes. In the second part of the thesis, novel uranyl complexes of the bis(2-hydroxyaryl) imine ligands have been synthesized and characterized. 1D coordination polymers and mononuclear structures were formed. In all complexes a distorted hexagonal bipyramidal coordination geometry around the uranyl centre is observed. The imine nitrogen atoms of the ligands do not bind to the metal centre but interact strongly with the hydroxy group via H-bonding. DFT calculations made with L8 ( α,α’-Bis(salicylimino)-m-xylene) are in good agreement with the X-ray crystal structure data. Liquid-liquid extraction studies involving selected ligands and Eu(III) or U(VI) indicate remarkably high selectivity for U(VI) over Eu(III) at weak acidic pH conditions. We believe that the study made opens up new possibilities for uranyl ion extraction which could be interesting in view of the treatment of nuclear waste. In the third part of the thesis, a series of multifunctional tripodal ligands with different N-donor centres were used for U(VI) and lanthanide, Nd(III), Eu(III) and Yb(III), binding and extraction. Reaction of these metal ions with selected tripodal ligands afforded complexes which were characterized by ESI mass spectroscopy. The complex composition was found to be 1:1 in all cases. The extraction behaviour of the tripodal ligands towards Eu(III) and U(VI) was studied both in the absence and presence of octanoic acid as co-ligand using the extraction system Eu(NO3)3 or UO2(NO3)2–buffer–H2O/ ligand–CHCl3. These separation systems show a remarkably high selectivity for U(VI) over Eu(III). It is interesting to note that the addition of the octanoic acid to the extraction system leads to high synergistic effects. A series of Eu(III) extraction experiments were done to clarify the composition of the extracted complexes. The results clearly point to the formation of various species with changing composition.

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Mukherjee, Soumen. "Transition metal complexes with imine-phenolate and imino-benzosemiquinone ligands synthesis, characterization, and their catalytic reactivity /". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=971568197.

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Wietzke, Raphaël. "Complexation des éléments par des ligands tripodes azotés : application à l'extraction sélective des actinides(III)". Université Joseph Fourier (Grenoble), 1999. http://www.theses.fr/1999GRE10223.

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Ce travail s'inscrit dans le cadre des recherches sur la separation actinides(iii)/lanthanides(iii) par extraction liquide-liquide. Nous nous sommes interesses a l'etude de la chimie de coordination des lanthanides(iii) et de l'uranium(iii) (modele des actinides(iii)), dans le but de mettre en evidence des differences entre les deux familles et de mieux comprendre les processus moleculaires impliques dans l'extraction. Nous avons ainsi etudie la complexation des lanthanides(iii) et de l'uranium(iii) par des ligands tripodes contenant des azotes aromatiques. Plusieurs ligands tripodes azotes ont ete synthetises en variant la nature et le nombre des atomes donneurs. Les complexes de lanthanides(iii) ont ete caracterises a l'etat solide et en solution (grace a differentes techniques : rmn 1h, es-ms, luminescence, spectrophotometrie uv, conductimetrie). Des differences dans le type de coordination ont pu etre mises en evidence selon la nature des atomes donneurs du ligand. Les deux nouveaux ligands, tris(2-pyrazinylmethyl)amine (tpza) et tris(n,n-diethyl-2-carbamoyl-6-pyridylmethyl)amine (tpaa), ont montre une selectivite pour les actinides(iii) avec des performances interessantes en extraction liquide-liquide. La comparaison des complexes de lanthane(iii) et d'uranium(iii) a l'etat solide et en solution a permis de mettre en evidence des differences dans la nature de la liaison qui pourraient etre attribuees a un certain pourcentage de covalence dans la liaison.

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Boudier, Adrien. "Design, synthesis and characterization of new ligands and activators for the oligomerization of ethylene by iron complexes". Phd thesis, Université de Strasbourg, 2012. http://tel.archives-ouvertes.fr/tel-00868786.

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This thesis describes the development of new catalytic systems based upon iron complexes and their reactivity toward ethylene. First, we focused our interest on the synthesis of iron(III) precursors chelated by monoanionic ligand. Those complexes were obtained either by reaction of the monoanionic ligand with FeCl3 or through oxidation of the iron(II) complex. The second reaction led to binuclear complexes. Then, another aim of the thesis was to design new well-defined cocatalysts for the activation of iron complexes. The study of the reaction between an alcohol and the trimethylaluminum allowed us to reach this aim. Aluminum complexes adopted either a binuclear framework or a trinuclear one, depending on the nature of alcohol reagent. Besides this work, new iron(II) and nickel(II) complexes chelated by imino-imidazole ligands bearing a pendant donor function L were synthesized. All complexes have been evaluated for the oligomerization of ethylene in the presence of EtAlCl2 or MAO as cocatalyst. Only nickel complexes were active toward ethylene transformation.

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Capítulos de livros sobre o assunto "Ligand imine"

Pardasani, R. T., e P. Pardasani. "Magnetic properties of bis(heterodinuclear) [CuIINiII]2 complex with unsymmetrical discompartmental imine-oxime ligand". In Magnetic Properties of Paramagnetic Compounds, 650–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54237-8_384.

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Horozić, Emir, e Jasmin Suljagić. "Characterization and Investigation of Bioactivity of Copper(II) and Cobalt(II) Complexes with Imine Ligand". In New Technologies, Development and Application II, 624–32. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18072-0_73.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of mixed ligand nickel(II) complex with half unit of vicinal oxime-imine and chloride". In Magnetic Properties of Paramagnetic Compounds, 552–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_347.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of linear heterotrinuclear FeIIICuIINiII complex with 1,4,7-trimethyl-1,4,7-triazacyclononane and asymmetric dicompartmented imine–oxime ligand". In Magnetic Properties of Paramagnetic Compounds, 397–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_221.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of linear heterotrinuclear FeIIINiIICuII complex with 1,4,7-trimethyl-1,4,7-triazacyclononane and asymmetric dicompartmented imine-oxime ligand". In Magnetic Properties of Paramagnetic Compounds, 399–400. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_222.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of linear heterotrinuclear FeIIIMnIICuII complex with 1,4,7-trimethyl-1,4,7-triazacyclononane and asymmetric dicompartmented imine-oxime ligand". In Magnetic Properties of Paramagnetic Compounds, 401–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_223.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of linear heterotrinuclear CoIIICuIINiII complex with 1,4,7-trimethyl-1,4,7-triazacyclononane and asymmetric dicompartmented imine-oxime ligand". In Magnetic Properties of Paramagnetic Compounds, 1141–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54231-6_678.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of mixed ligand nickel(II) complex with half unit of vicinal oxime-imine and acetic acid". In Magnetic Properties of Paramagnetic Compounds, 541–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_341.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of mixed ligand nickel(II) complex with half unit of vicimal oxime-imine and monochloroethanoic acid". In Magnetic Properties of Paramagnetic Compounds, 543–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_342.

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Pardasani, R. T., e P. Pardasani. "Magnetic properties of mixed ligand nickel(II) complex with half unit of vicimal oxime-imine and dichloroethanoic acid". In Magnetic Properties of Paramagnetic Compounds, 545–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-54234-7_343.

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Trabalhos de conferências sobre o assunto "Ligand imine"

Romero, María J., Luis M. González-Barcia, Manuel R. Bermejo, M. Isabel Fernández e Esther Gómez-Fórneas. "Supramolecular self-assembly of a symmetric imine ligand functionalized with a dansyl fluorophore moiety". In The 20th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2016. http://dx.doi.org/10.3390/ecsoc-20-d002.

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Baral, Minati, Amit Gupta e B. K. Kanungo. "Development of a dipodal Schiff base ligand with N-imine and O-naphtholate donors: A potential chelator towards Cu(II) metal ion established through potentiometric and spectrophotometric studies". In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2015): 4th National Conference on Advanced Materials and Radiation Physics. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4929176.

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Al Janabi, Basma, Juan M. Ortigueira e Jose Manuel Vila. "Synthesis and X-ray Diffraction of Cyclopalladated Compounds Derived from Imine Ligands". In International Electronic Conference on Synthetic Organic Chemistry. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/ecsoc-26-13699.

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Harmošová, Michaela, Martin Kello, Mária Vilková, Erika Samoľová e Ivan Potočňák. "Synthesis, structure and anticancer activity of Zr(IV) complexes with Schiff bases derived from 8-hydroxyquinoline". In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.439h.

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The Schiff base 2-{[(2-hydroxyphenyl)imino]methyl}quinolin-8-ol (HLH) and its 5,7-dibromo- (HBrLH) and 5,7-diiodo-derivatives (HILH), which were prepared by multi-step organic synthesis, were used to synthesize [Zr(L)2]·2DMF (1), [Zr(BrL)2]·DMF (2), and [Zr(IL)2]·2DMF (3) complexes. The prepared products were characterized by elemental analysis, IR and NMR spectroscopy, which also monitored the stability of the prepared substances in DMSO, and in the case of HBrLH, HILH and 3, also by single crystal X-ray structural analysis. In the complex 3, two IL ligands are tetradentately bound to the central zirconium(IV) atom via two oxygen and two nitrogen atoms. DMF molecules are outside the coordination sphere. In complexes 1 and 2, we assume an analogous structure. Due to poor solubility, the in vitro cytostatic activity of only complex 2 and its ligand HBrLH was studied against 8 cancer cell lines of different origin (cervix, colon, pancreas, skin, breast, lung, liver and blood) and their selectivity was studied against healthy cell line BJ-5t (human dermal fibroblasts). HBrLH is comparably active to the reference drug, cisplatin, but complex 2 showed lower biological activity. Selectivity of 2 or HBrLH was not observed.

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Maneiro, Marcelino, Gustavo González-Riopedre, M. Isabel Fernández-García, Ana González-Noya, Rosa Pedrido e Laura Rodríguez. "Synthetic Route to Novel Asymmetric Tetradentate Ligands Containing Both Amino and Imino Groups". In The 18th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ecsoc-18-a018.

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Romero, María J., Sandra Fernández-Fariña, Luis M. González-Barcia, Rosa Pedrido, Ana M. González-Noya e Marcelino Maneiro. "Synthesis of two asymmetric half-salen imine-type ligands as precursors of polynuclear metal complexes". In The 21st International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2017. http://dx.doi.org/10.3390/ecsoc-21-04752.

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González-Díaz, Humberto, Eugenio Uriarte, Esther Lete, Nuria Sotomayor e Sonia Arrasate. "QSRR prediction of Enantioselectivity Complex Networks related to the addition of organolithium reagents to imines in presence of chiral ligands". In The 13th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2009. http://dx.doi.org/10.3390/ecsoc-13-00239.

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Silva, Laila Taniellen Rodrigues Da, Lucas Lopes Barbosa, Milane Da Silva Viana, Jorge Luis De Oliveira Borges e Athauany Nogueira Dos Santos. "RELAÇÃO DA RESPOSTA IMUNE INATA E ADAPTATIVA À INFECÇÃO DE PARASITOS HELMÍNTICOS". In I Congresso Brasileiro de Parasitologia Humana On-line. Revista Multidisciplinar em Saúde, 2021. http://dx.doi.org/10.51161/rems/1960.

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Introdução: A resposta imunológica envolve mecanismos especializados, como órgãos, células e componentes humorais que constituem o sistema inato e o adaptativo, afim de garantir a sobrevivência do hospedeiro. A resposta imune inata é uma resposta primária, rápida e inespecífica, pronta para atacar a qualquer momento. A resposta imune adaptativa tem os linfócitos T e B como principais células de defesa, desenvolvida após contato com vários antígenos imunogênicos. Objetivo: O presente trabalho busca discutir sobre a relação da resposta imune inata e adaptativa contra helmintos. Material e métodos: Trata-se de uma revisão integrativa, realizada através de levantamento bibliográfico, baseado em 12 artigos encontrados nas bases de dados do SciElo, Biblioteca Virtual em Saúde (BVS) e PUBMED, dos últimos 10 anos, utilizando os descritores: “imunidade inata e adaptativa”, “resposta imune contra helmintos”, empregando critérios de inclusão e exclusão preliminarmente definidos. Resultados: Por serem multicelulares, os helmintos conseguem ter uma certa resistência ao sistema imune, devido possuírem uma membrana densa, na qual por serem grandes podem sobreviver a destruição pelo mecanismo de fagocitose do sistema imune produzida pelos macrófagos, neutrófilos e células dendríticas. Entretanto, os eosinófilos conseguem destruir os helmintos com sua habilidade de degranulação, onde as células T da imunidade adquirida, conseguem induzir os linfócitos B a produzirem anticorpos IgE, ativando os eosinófilos que irão se ligar aos helmintos liberando os grânulos citoplasmáticos produzindo uma citotoxicidade, onde na ligação de IgE com mastócitos irá sintetizar histamina para eliminar os vermes. Em suma, pode ser observado que nas infecções helmínticas, existe um aumento da quantidade de IgE, pois o sistema imune desenvolve um meio hostil no intestino, afim de expelir os helmintos do organismo, produzindo assim esses anticorpos, onde os altos níveis de IgE, mastócitos e eosinófilos são tidas como características da infecção por helmintos. Conclusão: O sistema imunológico do corpo humano é eficiente contra parasitos helmínticos, que por sua vez, são um sério problema de saúde pública. Os eosinófilos são fundamentais para eliminação dos mesmos, interagindo a imunidade inata com a adaptativa, pois obtém a capacidade de degranulação após liberação de grânulos citoplasmáticos, necessitando da produção de IgE pelos linfócitos B.

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Oliveira, Nicolly Rayanne Flor, CAMILA SOUSA FARIAS ARAÚJO e MORGANNA POLLYNNE NÓBREGA. "VÍRUS DA IMUNODEFICIÊNCIA HUMANA (HIV): DA ETIOLOGIA AO TRATAMENTO EM DIAS ATUAIS". In II Congresso Brasileiro de Imunologia On-line. Revista Multidisciplinar em Saúde, 2022. http://dx.doi.org/10.51161/ii-conbrai/6205.

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Introdução: O vírus da imunodeficiência humana (HIV), é um retrovírus que apresenta tropismo por células do sistema imune, especialmente linfócitos TCD4. Objetivo: Estabelecer correlações entre a etiologia ao tratamento de pacientes soro positivo em dias atuais. Métodos: Trata-se de uma revisão bibliográfica descritiva literária de análises de 12 artigos em português e inglês publicados em periódicos nos bancos de dados PubMed, Scentific Eletronic library (Scielo) entre 2018 e 2021. Resultados: Na infecção por HIV os Linfócitos T são afetados primariamente, neste processo os Receptores CD4 e quimiocina dos Linfócitos ligam-se as glicoproteínas GP120 e GP41 viral, sabe-se que esta liga é essencial para entrada do vírus na célula, após o processo de penetração do agente viral, ocorre síntese de proteínas e ácidos nucléicos, maturação e por fim liberação de vírions para que possam infectar novas células. As principais consequências a célula hospedeira é neutralização da função imune, formação de sincícios, falha na comunicação entre as células imunológicas , modificações genéticas e alteração do fluxo de íons ,o prejuízo final é a morte das células TCD4 acarretando em imunossupressão. O aparecimento de mutações tem interferido na efetividade do tratamento, a resistência surge com maior frequência a lamivudina , inibidores de transcriptase reversa não análogos de nucleotídeos e InSTIs de primeira geração, o dolutegravir (DTG) é um inibidor de transferência de fita da integrasse (INSTI) de segunda geração que relacionado aos INSTIS de primeira geração (oraltegravir e elvitegravir )apresenta uma barreira genética maior para o desenvolvimento de resistência ao HIV-1. Conclusão: O tratamento atual é o coquetel antirretroviral 3 em 1 composto por Tenofovir (300mg), Lamivudina (300mg) e Efavirenz (600mg), que deve ser tomado diariamente para evitar a replicação viral descontrolada e formação da AIDS,com terapia antirretroviral (TARV) foi observado a diminuição considerável na morbidade e mortalidade em pacientes portadores do vírus, no entanto, o HIV pode estabelecer reservatórios que escapam tanto do sistema imunológico quanto da TARV.

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Soares, Diego Bezerra, Isabela Reis Manzoli, Lohraine Talia Domingues, Paulo Schumann Neto e Mariana Kely Diniz Gomes De Lima. "ASPECTOS IMUNOLÓGICOS DE PATOGENICIDADE DA LEISHMANIOSE TEGUMENTAR AMERICANA CUTÂNEA". In II Congresso Brasileiro de Saúde On-line. Revista Multidisciplinar em Saúde, 2021. http://dx.doi.org/10.51161/rems/1445.

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Introdução: A leishmaniose tegumentar americana cutânea é um tipo de doença infecciosa não contagiosa causada por um protozoário do gênero Leishmania sp. que acomete principalmente a pele e as mucosas. Ademais, a transmissão é pelo repasto sanguíneo do mosquito flebotomíneo infectado com a forma promastigota presente na saliva do inseto. Além disso, essa patologia caracteriza-se por um acometimento de lesão ulcerada indolor única ou múltipla. Objetivos: Devido a elevada prevalência no número de casos de leishmaniose cutânea na região norte brasileira essa doença pode ser definida como uma endemia, uma vez que foram registrados nessa macrorregião cerca de 30% de todos os casos notificados em 2017. Nesse contexto, é primordial mais estudos que esclareçam a padronização dessa enfermidade. Dessa forma, foi levantada a seguinte problemática “Como ocorrem os fatores imunológicos de patogenicidade da leishmaniose? ”.Materiais e Método: A pesquisa consiste em uma revisão de literatura retrospectiva, com o intuito de elucidar o papel imunológico de virulência da infecção por leishmaniose cutânea. Resultados: A partir desse estudo foi possível observar que durante a picada do mosquito já se libera uma substância vasodilatadora chamada Maxidilan presente na saliva do flebotomíneo capaz de inibir as células apresentadoras de Antígenos (APC) e a citocina IL-12 que são responsáveis por desencadear a ativação da resposta imune contra os patógenos, favorecendo assim a infecção. Outrossim, os mecanismo sinalizadores de células, a ligação do parasita e a influência dos co-estimuladores de determinadas citocinas corroboram a disseminação do parasita, uma vez que por meio da inibição das células que apresentam esse antígeno, a leishmania consegue através da sua forma ativa começar um mecanismo de tropismo migrando para as regiões de sua preferência infectante onde induz a estimulação de macrófagos fixos se ligando a eles por estimuladores e inibindo o processo de fagocitose. Conclusão: Por meio desse estudo observou-se um importante aspecto de patogenicidade associado aos aspectos imunológicos presentes durante a infecção que oferece vantagem ao parasita sobre o sistema imune do hospedeiro.

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