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21.
Scientific-Research Institute of Mechanics, Gor'kii University. Translated from Izvestiya Vysshikh Uchenykh Zavedenii, Radiofizika, Vol. 32, No. 12, pp. 1502–1505, December, 1989. 相似文献
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Specific features of the hydrothermal interaction between chromium(VI) oxide and formic acid to give water-soluble nonstoichiometric hydroxo chromium(III) formates with compositions from the range Cr(OH)0.66(HCOO)2.34-Cr(OH)1.55(HCOO)1.45 were studied. These compounds can be used in formulations for chromium-plating electrolytes and tanning agents. 相似文献
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Tosylated and acetylated imidazolinium salts revealed an unexpected reactivity when treated with methyl iodide or benzyl bromide. Moreover an unprecedented acid-catalysed rearrangement for an acetylated imidazolinium salt was observed during an anion metathesis. 相似文献
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Guerrero-Sanchez C Erdmenger T Sereda P Wouters D Schubert US 《Chemistry (Weinheim an der Bergstrasse, Germany)》2006,12(35):9036-9045
Aqueous solutions of ionic liquids have been used as novel and environmentally friendly reaction media to synthesize and "control" the size of different cross-linked polymer beads by suspension polymerization reactions. It was found that the investigated ionic liquids can act as novel stabilizing agents of the suspensions as a result of their surface-active properties. The results have demonstrated that the average size of polymer beads can be varied from the macro- to the nanoscale and their surface area can also be "adjusted" by this synthetic approach. Furthermore, the use of a combination of ionic liquids and water for the synthesis of polymers, the simple isolation of the products formed in this polymerization procedure, as well as the recycling of the continuous medium for further reactions open up possibilities for the development of "new and green" polymerization processes. 相似文献
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The standard tunneling model describes quite satisfactorily the properties of amorphous solids at temperatures T < 1K in terms of an ensemble of two-level systems including the logarithmic temperature dependence of the dielectric constant. Yet, experiments have shown that at ultralow temperatures T< 5 mK such a temperature behavior breaks down and the dielectric constant becomes temperature independent (plateau effect). In this Letter we suggest an explanation of this behavior exploiting the effect of the nuclear quadrupole interaction on tunneling. We also predict that the application of a sufficiently large magnetic field B> 10T should restore the logarithmic dependence because of the suppression of the nuclear quadrupole interaction. 相似文献
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A new carboxy-monofunctionalized tertraarylporphyrin has been tested for cytotoxicity toward OV2008 human ovarian cancer cells. This compound acutely inhibits growth of ovarian cancer cells upon exposure to ambient light while suppresses long-term clonogenic survival of cells under both dark and light stimulated conditions. Because of the variable length of the linkage between the anthraquinone and porphyrin moieties, the synthesized monocarboxylated porphyrin presents a versatile scaffold for fine-tuning of the photoelectron transfer in the quinone-porphyrin conjugate. To demonstrate its synthetic value, we converted the carboxy derivative to its amino counterpart. 相似文献
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Dr. Dmitry Tsvetkov Maksim Mazurin Dr. Ivan Ivanov Dr. Dmitry Malyshkin Dr. Vladimir Sereda Prof. Andrey Zuev 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(55):12549-12552
Mechanochemical synthesis of CsPbI3, as a model system for ABX3 halides, was studied. Water was shown to strongly promote the kinetics of formation of CsPbI3 from the CsI+PbI2 mixture through increased mobility of the constituting ionic species. Since many binary and ternary halides are hygroscopic, it was concluded that the presence of small, uncontrollable and unintentional additions of water should often occur in both precursor mixtures and synthesized complex halides boosting the kinetics of formation of many, if not all, ternary organic–inorganic hybrid halides such as, for example, MAPbX3 (X=Cl, Br, I). In addition, trace amounts of water should influence the transport characteristics of complex halides. Thus, the presence of water explains, at least partially, the huge scatter in both the reported mechanochemical reaction times necessary for obtaining single-phase APbX3 perovskite halides and the activation energies of ionic diffusion in APbX3. 相似文献
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