Results 1 - 10 of 1930
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[en] A number of methods have been developed for the deoxygenation of amine-N-oxides, including agents such as low-valent titanium, Zn/HCOONH4, InCl3, tributyltin hydride, Pd/C, tetrathiomolybdate, SmI2, indium/NH4Cl, and Mo(CO)6, Cu(I)-Zn or Cu(I)-Al,11 RuCl3·xH2O, Zn/Cu-triflates. In conclusion, we have discovered that CeCl3·7H2O/Zn system mediates a selective and efficient deoxygenation of amine-N-oxides to the corresponding amines. Although the scope and limitations have not been fully established, the present procedure offers an attractive alternative to the conventional methods with its mildness and chemoselectivity as well as high yields. Further investigations of more useful applications with this system are currently in progress
[en] Electronic energy bands of CsCl crystal have been calculated within the mixed basis approach with using the core Bloch states and plane waves. The calculated energy parameters of the crystal are in the satisfactory agreement with the experimental data obtained from the analysis of the core-valence luminescence spectra. The obtained results form a base for calculation of CVL spectra parameters
[en] In 2008, the US Congress asked the National Academy of Sciences (NAS) to form the Committee on Radiation Source Use and Replacement. The NAS Committee was tasked with reviewing prospects for replacing IAEA Category 1 and 2 radionuclide sealed sources with less dangerous alternatives. The NAS Committee found that non-radionuclide replacements existed for nearly all Category 1 and 2 radionuclide sources in varying degrees of readiness. However, after reviewing the overall risks associated with radioactive caesium chloride (CsCl), the NAS Committee felt it was urgent to take near term action on CsCl sources. The Committee recommended that the US Government should implement options for eliminating Category 1 and 2 CsCl sources from use. The paper provides an overview of the risk based methodology that was used by the NAS Committee in formulating this recommendation. (author)
[en] A thermogravimetric investigation is carried out of the crystal Cs3Cu2Cl7x2H2O, which revealed a complex continuous process of its decomposition (70 deg C) and successive stepwise dehydration (120 deg and 170 deg C). It has been established that as a result of the decomposition and dehydration of Cs3Cu2Cl7x2H2O a mixture of CsCuCl3 and CsCuCl4 is formed, which melts at 460 deg C
[en] We describe the device suitable for high-resolution thermal expansion and magnetostriction measurements using a capacitive dilatometer which measures length changes with a sensitivity of Δl ≥ 10"-"2 Aa, corresponding to a relative resolution of Δl/l ∝ 10"-"1"0. The system operates down to 40 mK and in magnetic fields up to 18 T. We report measurements on the spin S = 1/2 triangular-lattice Heisenberg antiferromagnet Cs_2CuCl_4 aiming at exploring its field-induced quantum critical point.