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Showing 1 to 20 of 26 for “"Multinuclear NMR"”.
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Multinuclear NMR Investigations of Sol-Gel Systems
The inorganic polymeric materials known as oxide glasses are normally prepared by the fusion of refractory oxides, followed by rapid cooling to avoid devitrification. A topic of current interest in materials research is the preparation of oxide glasses by the hydrolysis and polymerization of metal …
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Chelated fluoroboron cations : synthesis and multinuclear nmr studies
… ligand, has been systematically studied by using multinuclear solution and solid state nuclear magnetic resonance spectroscopy and fast atom bombardment mass spectrometry. Three new methods of synthesis of (DD)BF2+ cations are reported, and compared with the previous method of reacting a chelating …
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Multinuclear NMR studies of zeolites and heme-proteins
… origin, reveals itself in a variety of ways in NMR spectroscopy. In solids, where motions are highly restricted, the quadrupolar interaction is anisotropic and orientation dependent. The static and time dependent parts of the quadrupolar interaction play different roles in the nuclear magnetic …
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Multinuclear NMR Studies of Gallium Complexes in Aqueous Solution.
… was investigated by nuclear magnetic resonance (NMR) spectroscopy. Specifically, these studies include: characterization under various experimental conditions (pH, concentration, temperature etc.) of gallium citrate complexes, of gallium phosphate complexes, and of gallium complexes with EDTA …
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Multinuclear NMR Studies of Hemoproteins and Their Model Compounds
Nuclear magnetic resonance (NMR) in both solution and solid state has been used to study the active site structure of various hemoproteins, and the nature of the iron-oxygen bond in oxyhemoglobin. The first iron-57 NMR spectra of a metalloprotein, carbonmonoxymyoglobin, has been obtained, yielding …
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Multinuclear NMR studies on solution structures and dynamics of triosmium hydrido carbonyl phosphine cluster compounds
… have been studied by extensive $\sp{13}$C NMR studies, including $\sp{13}$C$\{\sp1$H$\}$ COSY and $\sp{13}$C spin saturation transfer experiments.
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Multinuclear NMR Investigations of Local Structure, Distortions and Redox Mechanisms in Layered Lithium Ion Battery Cathode Materials
… implementation impractical. Solid state NMR is a powerful tool to study local structure and ^{6/7}Li NMR has been used extensively to probe many aspects of local structure and dynamics in Li-ion batteries. Less commonly studied nuclei, such as ^{59}Co and ^{17}O can also offer …
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Bis-and tris (amidine) fluoroboron cations and related systems studies by Multinuclear NMR and fast atom bombardment mass spectometry
… species which were detected by 19p and 11B NMR spectrometry. The displacement reaction of CI- from these D.BFnCI3-n (n = 1 and 2) species by the second entering ligand is much faster than in other nitrogen donor containing systems which have been previously studied. Tetramethylguanidine, …
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Experimental study of physical-chemical factors in the sol-gel process
A variety of experimental techniques (multinuclear NMR, Raman, small angle neutron scattering, fluorescence polarization, viscosity, turbidity, static and dynamic light scattering experiments) have been employed to investigate the nature of the sol-gel process of tetramethyl orthosilicate; …
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Synthesis and Stability Studies of Novel Tellurium(IV) Compounds
… stability has been studied experimentally via multinuclear NMR spectroscopy (1H, 13C, 125Te NMR) in solution with accurate experiments in the presence of different equivalents of water. The experimental data have been combined with theoretical calculations that confirmed the stability trend. …
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Studies of alkali metal compounds in diesel fuel and small molecule activation chemistry
… were characterised by X-ray crystallography and multinuclear NMR spectroscopy. This revealed a remarkable set of structures, ranging from dimeric arrangements in polar solvents to polymeric arrangements in non-coordinating solvents. A highlight is the structure of the long chain sodium …
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Nanostructured hybrid organic/inorganic materials by the nanobuilding blocks (NBB) approach
… by means of FT-IR, ATR/FT-IR, RAMAN, multinuclear NMR spectroscopies, SEM, N2 physisorption, Thermal analyses (TG/DTA), DSC. NBBs were used to prepare methacrylate-based matrices, which were subsequently exploited in order to produce patternable films by the two photon polymerisation …
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Hydrothermal Reaction of Crystalline Albite, Sodium Aluminosilicate Glass, and a Rhyolitic-Composition Glass With Aqueous Solutions: A Solid State Study
… reactions using high-resolution solid-state multinuclear NMR spectroscopy in combination with SEM, XRD, IR spectroscopy, and electron microprobe analysis are investigated. For crystalline albite, there are no detectable bulk or surface structural changes due to aqueous attack, indicating that …
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Synthesis and Antimalarial evaluation of Gold Thiosemicarbazone Complexes and Polyamine-Thiosemicarbazone Dendrimers
… All the compounds were characterised by multinuclear NMR and FT-IR spectroscopies, mass spectrometry and elemental analysis. Gold(I) complexes 4.15 and 4.16 were further characterised by single X-ray crystallography. The synthesised ligands and complexes were tested for their …
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A Nuclear Magnetic Resonance Approach Towards Understanding Surface Modification and its Influence on Ni-rich Layered Oxides in Li-ion Batteries
… Meanwhile, <sup>27</sup>Al solid state (ss)NMR indicates that the chemical evolution of the coating is not correlated with coating thicknesses. Detailed structural and chemical evolution of the Al<sub>2</sub>O<sub>3</sub> coating at different stages of the electrochemical cycling process is …
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Development of Electrolyte Salts for Multivalent Ion Batteries
… the Chevrel phase cathode. Solid-state 23Na NMR analysis as well as DFT calculations show that chloride-containing electrolytes facilitate the co-insertion of Na into the cathode material. In chapter 5 the hydroboration of pyridines and CO2 in the presence of pinacolborane is presented. An …
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Synthesis of New Alkyn-1-ylsilanes. 1,1-Organoboration, 1,2-Hydroboration
… fully characterized for the first time by modern NMR spectroscopic techniques and in some cases by X-ray structural analysis. The monoalkyn-1-yl(chloro)silanes were treated with BEt3 at 373-393 K for prolonged periods of time (up to 30 d), and the reactivity of the products was explored. For the …
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Synthesis and Characterization of Ruthenium (II) Complexes and their Applications to Atom Transfer Radical Addition Reactions
… ,ith Cp#Ru(PPh3)2Cl, and characterized by multinuclear NMR spectroscopy and X-ray crystallography. We have explored the efficiency of these complexes as catalysts for the atom transfer radical addition (ATRA) of various chloro-substrates (CCl4, CHCl3, p-TsCl, CCl3CO2Et, and CH2ClCO2Et) to …
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Organic-inorganic hybrid materials: new functionalised polyoxotungstates
… structures are confirmed and investigated using multinuclear NMR (\(^1\)H, \(^{31}\)P and \(^{29}\)Si), IR, MS, EA, single crystal X-ray diffraction and Cyclic Voltammography. The derivatised polyoxotungstate clusters have the potential to take part in further reactions using the organic …
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