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Showing 1 to 12 of 12 for “"11B NMR"”.
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Synthetic studies of sodium aminodiboranate salts with electronwithdrawing substituents
… species with sodium hydride. IR, 1H NMR, 13C NMR, and 11B NMR spectra are reported for all of these compounds, along with the crystal structures of N-trimethylsilyl¬amino¬diboranate and N-methyl-N-trimethylsilylaminodiboranate. Comparisons of 11B NMR chemical shifts suggest that …
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Nanoparticles as strengthening agents in polymer systems
… component of guar gum) has been investigated by 11B NMR spectroscopy. By comparison with the 11B NMR of boric acid and phenyl boronic acid complexes of 1,2-diols [HOCMe2CMe2OH, cis-C6H 10(OH)2, trans-C6H10(OH) 2, o-C6H4(OH)2], 1,3-diols (neol-H2), monosaccharides (L-fucose, mannose and galactose) …
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Bis-and tris (amidine) fluoroboron cations and related systems studies by Multinuclear NMR and fast atom bombardment mass spectometry
… cation 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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Development of new methods in solid-state NMR
… the information that may be extracted using NMR. MAS is able to remove first-order quadrupolar broadening but can only reduce the second-order contribution to the linewidth. The MQMAS and STMAS techniques have enabled high-resolution NMR spectra of half-integer quadrupolar nuclei in the solid …
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Activation of diboron reagents: The development of mild conditions for the synthesis of unique organoboron compounds
… extraordinary activity was observed. UV-Vis, 11B NMR, and solvent kinetic isotope experiments were employed to gain insight into the mechanism, which showed the possibility of autocatalysis. Attempts to control stereoselectivity were not successful, although these results were rationalized by …
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Implementation of Solution and Solid Sate Nuclear Magnetic Resonance (NMR) Spectroscopic Techniques for Quantitative and Qualitative Analysis of Molecular Species
… of part I (application of solution state NMR spectroscopy in pharmaceutical sciences) is to apply NMR techniques in different pharmaceutical projects. In chapter3, a real-time quantification of in vitro Bortezomib (BTZ) release from alginate microparticles using a solution state …
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Diastereoselective α-Alkylation of Chiral β-Borylated Esters
… also real-time analysis of the reaction by ¹¹B NMR experiments.
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Volatile metal borohydride complexes: synthesis and characterization of new chemical vapor deposition precursors
… borohydride, Mg(BH4)4, were observed by 11B NMR in the reaction mixture. Static chemical vapor deposition (CVD) has been successfully used to deposit conformal thin films of hafnium diboride, HfB2, and iron metal from hafnium borohydride, Hf(BH4)4, and iron pentacarbonyl, Fe(CO)5, …
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New Solid Polymer Electrolytes for Lithium, Sodium, and Calcium-based Batteries
… The structure of the polymer was confirmed by 1H NMR, 13C NMR, and 11B NMR, and the FTIR spectra confirmed the crosslinking reaction with HMDI. The mechanical and thermal stabilities of the samples were evaluated by DSC and TGA, and FTIR spectroscopic analysis showed the efficiency of the …
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Oligomere und hochenergetische Borazide sowie elektrophile N+−F-Fluorierungsmittel
… Bildung von 8 zu verstehen, wurde die Reaktion 11B NMR spektroskopisch bei tiefen Temperaturen untersucht. Dabei konnte gezeigt werden, daß sich bei Temperaturen unter −30 °C zuerst das erwartete 9-BBN-N3 (7) bildet, welches bei höheren Temperaturen unter N2-Abspaltung zu 8 weiterreagiert. Für …
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Chemical approaches to the improved performance of nanoelectronic devices
… that generates Nd(dmadb)3 was examined by 11B NMR spectroscopy. We found that the treatment of NdCl3 with three equivalents of Na(dmadb) in thf does not directly afford the tri-substituted product. Instead, a partial substitution takes place to make Nd(dmadb)Cl2(thf)x in solution; the …
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High coordination number compounds of thorium borohydride, and of calcium and strontium N,N-dimethylaminodiboranates
… by infrared spectroscopy, and by 1H and 11B NMR spectroscopy. The crystal structures of Th(BH4)4(Et2O)2 and Th(BH4)4(thf)2 have been characterized by single crystal X-ray diffraction; both adopt trans-octahedral geometries, if the BH4 groups are considered to occupy one coordination site. …