- FT-IR and NMR study of tris(oxaalkyl) borates and their complexes with HAuCl4
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Three tris(oxaalkyl) borates and their complexes with HAuCl4 were studied by FT-IR, 1H and 13C NMR spectroscopy. Continuous absorption in the FT-IR spectra of the complexes testifies the formation of proton channels showing large proton polarizability. The shape of the proton potential is discussed on the basis of the NM -data. (C) 2000 Elsevier Science B.V.
- Brzezinski,Gierczyk,Rózalski,Wojciechowski,Schroeder,Zundel
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- FTIR and multinuclear magnetic resonance studies of tris(oxaalkyl) borates and their complexes with Li+ and Na+ cations
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FTIR and NMR of 1H, 13C, 11B, 7Li and 23Na nuclei were used for the study of the complexation of Li+ and Na+ cations by three tris(oxaalkyl) borates. The NMR techniques proved the formation of complexes and the fluctuation of Li+ and Na+ cations in the respective channels formed by three oxaalkyl chains. In the FTIR spectra of Li+ complexes with three tris(oxaalkyl) borates, continuous absorption in the far-infrared region indicates the fast fluctuations of Li+ ion between O atoms of the channels. The dependence of the continua shape on the length of the channels, i.e., the number of minima in the multiminima potentials, demonstrates that the fluctuation of Li+ ion occurs along the channel. Owing to the larger mass and diameter of the Na+ cation in the Na+-tris(oxaalkyl) borate complexes, only systems with longer channels show a large Na+ polarizability due to the fast fluctuation of Na+ cations in a multiminima potential.
- Gierczyk, B??azj,Schroeder, Grzegorz,Wojciechowski, Grzegorz,Roì?zalski, Bartosz,Brzezinski, Bogumil,Zundel, Georg
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- Multinuclear NMR studies of tris(oxaalkyl) borates and their complexes with some metal cations
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Nuclear magnetic resonance (NMR) of 1H, 13C, 11B and 17O nuclei has been used for the study of complexation of CoCl2, NiCl2 and CuCl2 salts with three tris(oxaalkyl) borates. All NMR techniques demonstrated the formation of complexes but the most informative were the 13C and 17O NMR measurements. The structures of the complexes formed are discussed in this article.
- Gierczyk,Schroeder,Nowak-Wydra,Wojciechowski,Brzezinski
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- B-podand complexes with sodium ions: the reaction heats and PM5 semiempirical calculation
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The complexation reactions of two types of tris(oxaalkyl) borates (B-podands with CH3 or C16H33 terminal groups) with Na+ cations have been studied by calorimetric and PM5 theoretical methods. Both methods provi
- ?eska, Bogus?awa,Pankiewicz, Rados?aw,Nevecheriya, Oksana,Rybachenko, Volodimir I.,Schroeder, Grzegorz,Brzezinski, Bogumi?
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- TRICYANOBORATE ALKYL ETHERS
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The invention relates to tricyanoborate alkyl ethers, a method for their preparation and their use as ionic liquids.
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(2014/03/26)
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- Copper-catalyzed trifluoromethylation of aryl iodides with potassium (trifluoromethyl)trimethoxyborate
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Potassium (trifluoromethyl)trimethoxyborate is introduced as a new source of CF3 nucleophiles in copper-catalyzed trifluoromethylation reactions. The crystalline salt is stable on storage, easy to handle, and can be obtained in near-quantitative yields simply by mixing B(OMe)3, CF3SiMe3, and KF. The trifluoromethylation reagent allows the conversion of various aryl iodides into the corresponding benzotrifluorides in high yields under mild, base-free conditions in the presence of catalytic quantities of a CuI/1,10-phenanthroline complex.
- Knauber, Thomas,Arikan, Fatih,Roeschenthaler, Gerd-Volker,Goossen, Lukas J.
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scheme or table
p. 2689 - 2697
(2011/04/15)
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- Process for preparing aldehydes from oxirane compounds
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Aldehydes are prepared by reacting an oxirane compound with hydrogen peroxide in the presence of a boron compound.
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