Bibliographies thématiques / Compounds Containing Polydentate Chelators

Littérature scientifique sur le sujet « Compounds Containing Polydentate Chelators »

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Publié le 18 mai 2024

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Articles de revues sur le sujet "Compounds Containing Polydentate Chelators"

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Baral, Minati, B. K. Kanungo et Peter Moore. « Synthesis of cis, cis-1,3,5-trisubstituted cyclohexane based chelators with polyfunctional pendant arms ». Journal of Chemical Research 2005, no 1 (janvier 2005) : 43–45. http://dx.doi.org/10.3184/0308234053431149.

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Some novel organic compounds of the type: cis, cis-1,3,5-tris(X)cyclohexane, where X= –CONH(CH2)2NH2, –CONH(CH2)3NH2, –CONH(CH2)2NCH –C6H4OH, CONH(CH2)3NCHC6H4OH, which are expected to function as potential polydentate chelators have been synthesised from 1,3,5-benzenetricarboxylic acid through multi-steps reactions. 1,3,5-benzenetricarboxylic acid was reduced to cis, cis-1,3,5-tris(ethylcarboxylate)cyclohexane, which on reaction with excess of 1,2-diaminoethane and 1,2-diaminopropane afforded two new compounds. Condensation of the obtained derivatives with three equivalents of salicylaldehyde resulted the formation of two new Schiff base compounds. All the compounds were characterised by a combination of elemental analysis, mass, IR, UV-Vis, 1H NMR and 13C NMR spectroscopy.
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Polivanova, A. G., I. N. Solovieva, D. O. Botev, D. Y. Yuriev, A. N. Mylnikova et M. S. Oshchepkov. « Bifunctional gallium cation chelators ». Fine Chemical Technologies 17, no 2 (31 mai 2022) : 107–30. http://dx.doi.org/10.32362/2410-6593-2022-17-2-107-130.

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Objectives. The chemistry of 67Ga and 68Ga radionuclides plays a key role in nuclear medicine for applications in radiopharmaceuticals, in particular, in noninvasive in vivo molecular imaging techniques. The use of radiometals for labeling biomolecules typically requires the use of bifunctional chelators, which contain a functional group for covalent bonding with the targeting vector in addition to the polydentate fragment coordinating the metal. The aim of the present review article is to analyze the currently accumulated experimental material on the development and application of bifunctional chelators of gallium cations in medical research, as well as to identify the main requirements for the structure of the chelator and its complexes with 68Ga, which are used to create effective Gabased pharmaceutical preparations.Results. The review analyzed macrocyclic bifunctional chelators forming stable in vivo complexes with 68Ga and acyclic chelators, whose main advantage is faster complexation kinetics due to the short half-life of 68Ga. The advantages and disadvantages of both types of ligands were evaluated. In addition, a critical analysis of the binding constants and the conditions for the formation of complexes was presented. Examples of the influence of the geometry, lipophilicity, and total charge of the metal complex on the biodistribution of target radiopharmaceuticals were also given.Conclusions. Despite the progress made in the considered areas of bifunctional chelators, the problem of correlating the chemical structure of a metal-based radiopharmaceutical with its behavior in vivo remains important. Comparative studies of drugs having an identical targeting vector but containing different bifunctional chelating agents could help further elucidate the effectof metal chelate moiety on pharmacokinetics. In order to create effective bifunctional chelating agents, it is necessary to take into account such factors as the stability and inertness of the chelator and its complexes under physiological conditions, lipophilicity, complexation kinetics, chelation selectivity, combinatoriality of the basic structure, along with economic aspects, e.g., the availability of raw materials and the complexity of the synthesis scheme.
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Bogdanova, Irina, Dmitriy Andreev, Boris Skulin, Valentina Grabel'nyh, Nina Sosnovskaya et Nikolay Korchevin. « THE USE OF POLYDENTATE CHALCOGEN-CONTAINING LIGANDS IN THE TECHNOLOGY OF BRILLIANT NICKEL PLATING ». Modern Technologies and Scientific and Technological Progress 1, no 1 (17 mai 2021) : 17–18. http://dx.doi.org/10.36629/2686-9896-2021-1-1-17-18.

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. Neutral chalcogen-containing polydentate compounds were used for the first time to obtain shiny nickel coatings from Watts electrolyte. The main technological parameters of electrolysis that ensure the production of the highest quality coatings are identified.
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Herrero, Santiago, et Miguel A. Usón. « Stereochemical nomenclature for octahedral coordination compounds containing polydentate ligands : a comprehensive proposal ». Dalton Transactions, no 37 (2008) : 4993. http://dx.doi.org/10.1039/b806050a.

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Egbers, Philipp H., Tilmann Harder, Boris P. Koch et Jan Tebben. « Siderophore purification with titanium dioxide nanoparticle solid phase extraction ». Analyst 145, no 22 (2020) : 7303–11. http://dx.doi.org/10.1039/d0an00949k.

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The study of bacterial metal chelators, so called siderophores, requires robust analytical methods that selectively target and extract strong iron-binding compounds from complex samples containing a plethora of organic molecules.
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Raptopoulou, Catherine P. « Heterometallic Complexes Containing the NiII-LnIII-NiII Moiety—Structures and Magnetic Properties ». Crystals 10, no 12 (8 décembre 2020) : 1117. http://dx.doi.org/10.3390/cryst10121117.

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This review summarizes the structural characteristics and magnetic properties of trinuclear complexes containing the NiII-LnIII-NiII moiety and also oligonuclear complexes and coordination polymers containing the same trinuclear moiety. The ligands used are mainly polydentate Schiff base ligands and reduced Schiff base ligands and, in some cases, oximato, β-diketonato, pyridyl ketone ligands and others. The compounds reported are restricted to those containing one, two and three oxygen atoms as bridges between the metal ions; examples of carboxylato and oximato bridging are also included due to structural similarity. The magnetic properties of the complexes range from ferro- to antiferromagnetic depending on the nature of the lanthanide ion.
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Zubenko, Anastasia D., Anna A. Shchukina et Olga A. Fedorova. « Synthetic Approaches to the Bifunctional Chelators for Radio­nuclides Based On Pyridine-Containing Azacrown Compounds ». Synthesis 52, no 07 (16 décembre 2019) : 1087–95. http://dx.doi.org/10.1055/s-0039-1691540.

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Synthetic ways to introduce functional groups (CO2Me, CO2H, OCH2CO2H, OCH2C≡CH, CH2OH, CH2Cl, CH2N3) into the pyridine ring of pyridine-containing azacrown compounds are described. These groups were introduced at position-4 of the pyridine ring, while keeping the macrocyclic carboxylate groups available for metal chelation. The derivatives were obtained by macrocyclization reaction of 4-substituted, trimethyl pyridine-2,4,6-tricarboxylate or by modification of methyl ester group in pyridine fragment of macrocycles. Obtained derivatives can be applied for preparing radiotherapeutic agents by conjugation to different vector biomolecules for targeted drug delivery to cancer cells without damaging healthy tissue.
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Lazarev, N., B. Petrov, A. Piskunov, P. Pochekutova et V. Semenov. « Temperature Dependences of the Saturated Vapor Pressure of Tin (IV) Complexes with Polydentate Ligands ». Bulletin of the South Ural State University series "Chemistry" 14, no 1 (2022) : 95–104. http://dx.doi.org/10.14529/chem220111.

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The present paper is a continuation of the previously pursued studies of thermal properties of the Sn(IV) complexes with tridentate iminopyridine ligands. The study of thermal properties including temperature dependences of the saturated vapor pressure for Sn(IV) complexes with the tridentate iminopyridine ligands by differential scanning calorimetry (DSC) and the Knudsen effusion method leads to the use of the studied compounds as luminescent materials, as well as components for nonlinear optics. Coordination compounds of tin (IV) containing tridentate Schiff bases were chosen as objects of research: 2,4-di-tert-butyl-6-((phenyl (pyridin-2-yl)methylene)amino)phenolatotrichlorotin(IV) (1), 4-methyl-2-((phenyl (pyridin-2-yl)methylene)amino)phenolatotrichlorotin(IV) (2), 4-chloro-2-((phenyl (pyridin-2-yl)methylene)amino) phenolatotrichlorotin(IV) (3). These compounds were obtained by tem-plate synthesis from tin tetrachloride, various o-aminophenols, and α-carbonyl substituted pyri-dines; they contain an iminopyridine function and are capable of covalently binding to a metal by a phenolic group. Phase transitions of compounds 1–3 were studied by DSC in the temperature range 25–500 °C. For all studied complexes an endothermic transition correlated to melting was revealed. The melting points of the studied compounds were taken to be the temperature values corresponding to the onset of the transition, according to the standard Netzsch Software Proteus method: 300, 320 and 330 °C for 1–3, respectively. The temperature dependences of the saturated vapor pressure were obtained for the studied complexes, using the Knudsen effusion method with the weight recording of the amounts of sublimated substances. As a result of the experiments it was found that compounds 1–3 sublimated in the temperature ranges of 239–244, 228–260 and 226–256 °C, respectively. Thermodynamic parameters of sublimation processes were calculated.
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Gacesa, Ranko, Andrea A. P. Tripodi, Agostino Cilibrizzi, Antonella Leggio, Robert Hider et Vincenzo Abbate. « Solid-Phase Synthesis and In-Silico Analysis of Iron-Binding Catecholato Chelators ». International Journal of Molecular Sciences 21, no 20 (12 octobre 2020) : 7498. http://dx.doi.org/10.3390/ijms21207498.

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Siderophores are iron-complexing compounds synthesized by bacteria and fungi. They are low molecular weight compounds (500-1500 Daltons) possessing high affinity for iron(III). Since 1970 a large number of siderophores have been characterized, the majority using hydroxamate or catecholate as functional groups. The biosynthesis of siderophores is typically regulated by the iron levels of the environment where the organism is located. Because of their exclusive affinity and specificity for iron(III), natural siderophores and their synthetic derivatives have been exploited in the treatment of human iron-overload diseases, as both diagnostic and therapeutic agents. Here, solid-phase approach for the preparation of hexadentate, peptide-based tricatecholato containing peptides is described. The versatility of the synthetic method allows for the design of a common scaffolding structure whereby diverse ligands can be conjugated. With so many possibilities, a computational approach has been developed which will facilitate the identification of those peptides which are capable of providing a high affinity iron(III) binding site. This study reports an integrated computational/synthetic approach towards a rational development of peptide-based siderophores.
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Grim, Samuel O., Samuel A. Sangokoya, Ian J. Colquhoun, William McFarlane et Raj K. Khanna. « Polydentate ligands containing phosphorus. 11. Synthesis of three new anionic tripod ligands, their neutral precursors, and related compounds ». Inorganic Chemistry 25, no 16 (juillet 1986) : 2699–704. http://dx.doi.org/10.1021/ic00236a009.

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Thèses sur le sujet "Compounds Containing Polydentate Chelators"

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黎寶韻 et Po-wan Lai. « Synthesis, structural characterization and photophysical properties oflanthanide complexes containing polydentate amide ligands ». Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B42576180.

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Lai, Po-wan. « Synthesis, structural characterization and photophysical properties of lanthanide complexes containing polydentate amide ligands ». Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B42576180.

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Straistari, Tatiana. « Synthesis and study of coordination compounds of cobalt, copper, palladium and nickel with polydentate ligands containing sulfur ». Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4352.

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Ce travail porte sur la synthèse, la caractérisation et l’évaluation en catalyse de réduction des protons en dihydrogène, de nouveaux complexes de Ni(II), Co(III), Cu(II) et Pd(II) basés sur des ligands de type thiosemicarbazone. La nature de l’espèce catalytique active a été étudiée par voltampérométrie cyclique et des propositions de mécanisme ont été formulés sur la base de calcul quantique de type DFT.Le premier chapitre introduit le contexte scientifique. Le second chapitre concerne la synthèse et la caractérisation des ligands de type N2S2 et des complexes mononucléaires associés de Ni, Cu et Pd. Le troisième chapitre présente la synthèse et la caractérisation de complexes binucléaires de Co et trinucléaire de Ni.Les études électrochimiques de ces complexes dans le DMF en présence d’une source de protons, nous a permis d’évaluer leur efficacité catalytique. Nos résultats montrent que les complexes du Cu et du Pd présentent une vague irréversible spécifique pour la réduction des protons, mais une décomposition est observée durant l’électrolyse. Par contre, les complexes de Ni et de Co ont montré une stabilité électrochimique ainsi que de bonnes performances catalytiques. En particulier, le nouveau complexe mononucléaire de Ni présente des propriétés catalytiques remarquables qui le classent parmi les meilleurs catalyseurs de la réduction des protons décrits dans la littérature. L’ensemble de ce travail fourni une description complète du comportement électrochimique des ligands de type N2S2 complexés à des métaux de transition. Il permet d’envisager des développements futurs dans l’amélioration des propriétés catalytiques de ces complexes
This work focuses on the synthesis, the characterization and the catalytic evaluation in the reduction of protons into dihydrogen, of new complexes of Ni(II), Co(III), Cu(II) and Pd(II) based ligands Type thiosemicarbazone. The catalytically active species during the process of the proton reduction was studied by cyclic voltammetry and mechanisms were formulated on the basis quantum chemical calculation.The first chapter introduces the scientific context, the goals and the main objectives of this work. The second chapter concerns the synthesis and the characterization of the N2S2 ligands and their associated mononuclear complexes, Ni, Cu and Pd. The third chapter presents the synthesis and the characterization of binuclear Co and trinuclear Ni based on N2S2 ligand.Electrochemical studies of these complexes in DMF in the presence of a proton source (trifluoroacetic acid), allowed us to evaluate their catalytic efficiency. Our results show that Cu and Pd complexes have a specific irreversible wave for the reduction of protons, but decomposition is observed during electrolysis, which makes these uninteresting complexes for the reduction of protons.On the contrary, Ni and Co complexes showed an electrochemical stability and good catalytic performances. In particular, the new mononuclear Ni complex exhibits remarkable catalytic properties that rank it among the best catalysts for the reduction of protons reported in the literature. All this work provided a complete description of the electrochemical behavior of N2S2 thiosemicarbazone ligands complexed to transition metals. It allows considering future developments in improving the catalytic properties of these complexes
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Chapitres de livres sur le sujet "Compounds Containing Polydentate Chelators"

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Pardasani, R. T., et P. Pardasani. « Magnetic properties of methoxy bridged binuclear copper(II) complex containing Cu2O2 butterfly core with polydentate open structure ligand ». Dans Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 6, 1205–7. Berlin, Heidelberg : Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65056-1_431.

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Pardasani, R. T., et P. Pardasani. « Magnetic properties of phenoxy-hydroxy bridged binuclear copper(II) complex containing Cu2O2 butterfly core with polydentate open structure ligand ». Dans Magnetic Properties of Paramagnetic Compounds, Magnetic Susceptibility Data, Volume 6, 1208–11. Berlin, Heidelberg : Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-65056-1_432.

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Shivhare, Ruchi, Kishor Danao, Deweshri Nandurkar, Vijayshri Rokde, Ashwini Ingole, Amol Warokar et Ujwala Mahajan. « Schiff Base as Multifaceted Bioactive Core ». Dans Schiff Base in Organic, Inorganic and Physical Chemistry [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108387.

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Schiff bases are the condensation products of primary amines and carbonyl compounds, which are becoming more and more significant. Schiff bases are imine or azomethine (–C=N–) functional group containing compounds that are produced through a nucleophile addition process. Excellent chelators called Schiff bases have a place in both qualitative and quantitative analysis of metals in aqueous media. Schiff bases were discovered to be auxiliary scaffolds and adaptable pharmacophore for the creation and production of numerous bioactive leads compounds, and this special quality made them accessible for a wide range of biological applications. Schiff bases exhibit significant biological properties including analgesic, anti-inflammatory, antibacterial, anticonvulsant, anti-tubercular, anticancer, antioxidant, anthelmintic antiglycation, and antidepressant activities. In situ cross-linked hydrogel systems are created using the Schiff bases, which are frequently utilized in coordination, organometallic chemistry, and tissue engineering applications. The role of Schiff bases to the design and creation of new lead with potential biological functions is highlighted in this chapter. Researchers’ interest in obtaining the most conclusive and suggestive information on the numerous Schiff bases that have been important for therapeutic purposes over the last few decades and their use in coordination complexes has been maintained by this bioactive core.
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