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Showing 1 to 18 of 18 for “"Chelating Ligand"”.
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Systematic Studies on the Chelating Ligand Effects of Novel Borafluoronium Ions
… characterization of borafluoronium ions via a ligand-based strategy using bidentate amine and phosphine bases as chelating agents to cationic boronium ions.The borafluoronium complexes A–C were synthesized in high yields (80%–95%) and characterized using NMR spectroscopy and single crystal …
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Modified Organoclay Containing Chelating Ligand for Adsorption of Heavy Metals in Solution.
<p>Presence of a chelating ligand in the clay structure significantly improves its ability to immobilize heavy metals from contaminated sludge or wastewater. Two-step modification procedure comprising sequential pillaring and grafting of chelating agent to the modified clay is …
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The palladium-catalyzed synthesis of organic amines
Chapter 1. The chelating ligand bis[2-(diphenylphosphino)phenyl] ether (DPEphos), in combination with palladium acetate, forms a highly active catalyst system for the coupling of anilines with aryl bromides. The bisphosphine is easily prepared in large quantity and at low cost by a known procedure. …
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Investigating the Tyrosine-Histidine Linkage in the Copper B Site of Cytochrome C Oxidase: Model Studies Utilizing a Zinc Imidazole-Phenol Containing Complex
A chelating ligand (BPAIP) was synthesized incorporating an ortho substituted imidazole-phenol moiety. The resultant Zn(II) complex, [Zn(BPAIP)(Br)]+, was found to exhibit a decreased pK A (8.24) and increased oxidation potential relative to the unbound BPAIP. In addition, the stability of …
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A Computational Study on 18+δ Organometallics
… complexes of Co(CO)3 and ReBr(CO)3, with the chelating ligand 2,3-bisphosphinomaleic anhydride, in 19- and 18-electron forms. The SBKJC-21G effective core potential and associated basis set was used for metals (Co/Re) and the 6-31G* basis set was used for all other elements. The differences of …
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Site-Selective Anion Exchange in a Palladophosphorane
Reported here are studies on the chemoselective ligand substitution at a palladophosphorane possessing two potential sites of chloride substitution. Ligation of palladium(II) chloride with a tridentate chelating ligand (L, P(N(o-N(2-pyridyl)C₆H₄)₂) results in formation of a complex comprising a d⁸ …
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Magnetic resonance investigations of pH in microemulsions
… of the paramagnetic species Cu(II), with the chelating ligand triethylenetetramine. However, it was found that MR contrast agents were not required for probing the pH in reverse micelles of the CTAB and Triton-X microemulsions. Magnetic resonance imaging of the bromate- sulfite reaction in a …
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Studies with dithizone : the extraction of thallium (III)
… complex: the dithizone acts as a bidentate chelating ligand co-ordinating through the nitrogen and sulphur atoms. Ethanol (solvent of recrystallisation) co-ordinates in the fifth position.
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Ligand design for molecule-based magnetic and/or conducting materials
… preparation of a new family of tetracarboxamide ligands. Four new ligands I-III have been prepared and characterized and the coordination chemistry of these ligands is presented. This project was then extended to exploit 4,4’-bipyridine as a covalent linker between two N3O2 macrocyles. In this …
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Nonspectator Reactivity of Nontrigonal Tricoordinate Phosphorus Ligands
… geometrically deformed tricoordinate phosphorus ligands that diverge from traditional supporting roles of phosphines in transition metal catalysis. Chapter 1 presents an overview of the chemistry of higher coordinate phosphorus ligands in transition metal complexes. Chapter 2 describes …
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X-ray crystal structures of: [Rh2(N-{2,4,6-CH3}C6H2)COCH3)4]•2NCC6H4 AND Ba1.5[Fe(C10H13N2O7)][Co(CN)6]•9H2O; two crystallographic challenges
… atom (nearly octahedral) was coordinated to one chelating ligand (derived from ethylenediaminetetraacetic acid) and the nitrogen of a cyanide ligand. The carbon of the cyanide ligand was bound to cobalt (octahedral). Thus, the cyanide ligand serves as a bridge between the two metals.</p>
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Palladium catalysis in the synthesis of polyaniline-related materials
… amination of aryl halides and triflates. The chelating ligand bis[2-(diphenylphosphino) phenyl] ether (DPEphos), in combination with palladium acetate, forms a highly active catalyst system for the coupling of anilines with aryl bromides. A modification in the experimental procedure for aryl …
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Improved Synthesis, Separation, Transition Metal Coordination and Reaction Chemistry of a New Binucleating Tetraphosphine Ligand
… complexes based on linear tetraphosphine ligand, PEt2CH2CH2(Ph)PCH2P(Ph)CH2CH2PEt2, et,ph-P4. Under conditions tested no alcohol products were detected. However we have observed formation of a small amount of oxidative cleavage products. Results from studies of oxidative cleavage reactions …
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Investigating the Cluster Chemistry of α-Methyl-2-pyridine methanol (mpmH) with Select 3d Ions
… chemistry of the potentially chiral bridging, chelating ligand, α-methyl-2-pyridinemethanol (mpmH) with select 3d ions for the discovery of polynuclear clusters with single molecule magnet (SMM) properties. Chapter 1 introduces the theory of molecular magnetism, SMMs and the concepts of chiral …
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Exploring Siderophore-Mineral Interaction Using Force Microscopy and Computational Chemistry
… compared to aluminum. Attachment of the ligand to each surface was directed by steric forces within the molecule and coulombic interactions between the siderophore oxygens and the metals in the mineral. Chelating ligand pairs coordinated with neighboring metal atoms in a bidentate, …
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Design and synthesis of components for optically active metal-organic frameworks (MOFs) and synthetic routes to diverse deuterium labelled α-diazoacetates, α-diazoacetamides, α-diazoketones, and the antibiotic azaserine
… linker providing a highly effective chelating ligand. α-Diazocarbonyl compounds are useful intermediates for various chemical transformations. Although known since the mid-1800s, they still offer an area for future studies and development of preparative methods as well as …
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Poly(p-xylylene) Nanotubes Prepared via the Tubes by Fiber Templates Process as Catalytic Nanoreactors
… (TEMPO) catalyst or a bipyridine ligand. The bidentate chelating ligand was then used to immobilize copper. In order to test the tube catalysts, suitable model reactions were conducted: The TEMPO-functionalized tubes were used for the oxidation of benzyl alcohol, resulting in > 98 …
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NEW NCN-PLATINUM(II) COMPLEXES WITH LUMINESCENT PROPERTIES
… new compounds. These complexes have a terdentate chelating ligand with the general scaffold of a 1,3-di(2-pyridyl)benzene and were designed following different strategies: i) Complexes PtCl1-PtCl7 have unsubstituted pyridines and different groups in position 5 of the benzene ring, i.e. a mesityl, …