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111.
É. L. Kristallovich N. D. Abdullaev A. L. D'yakonov L. V. Molchanov M. V. Telezhenetskaya 《Chemistry of Natural Compounds》1997,33(6):667-669
We have investigated the IR spectra in the region of stretching vibration of N+–H and OH groups of the hydrochlorides of 2,3-trimethylene-3,4-dihydroquinazoline (deoxypeganine, DOP), 2,3-tetramethylene-3,4-dihydroquinazoline (tetrazoline), and 2,3-pentamethylene-3,4-dihydroquinazoline (pentazoline) and peganol and peganine and the corresponding complexes with ZnCl2, CoCl2, and MnCl2. The appearance of two additional absorption bands in the 3100–3300 cm–1 region in the complexes investigated as compared with the corresponding hydrochlorides witnesses the formation of interionic hydrogen bonds between the quinazoline cation and the (MeCl4)2– anion.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (3712) 40 64 75. Translated from Khimiya Prirodnykh Soedinenii, No. 6., pp. 854–857, November–December, 1997. 相似文献
112.
B. A. Maksimov S. S. Kazantsev V. N. Molchanov I. A. Verin B. V. Mill 《Crystallography Reports》2004,49(4):585-590
The crystal structure of monoclinic La3SbZn3Ge2O14 crystals from the langasite family is determined by X-ray diffraction analysis [a = 5.202(1) Å, b = 8.312(1) Å, c = 14.394(2) Å, β = 90.02(1)°, sp. gr. A2, Z = 2, and R/R w = (5.2/4.6)%]. The structure is a derivative of the Ca3Ga2Ge4O14-type structure (a = 8.069 Å, c = 4.967 Å, sp. gr. P321, Z = 1). The crystal studied is a polysynthetic twin with the twin index n = 2, whose monoclinic components are related by pseudomerohedry by a threefold rotation axis of the supergroup P321. 相似文献
113.
Lebedev-Stepanov P. V. Dideykin A. T. Chvalun S. N. Vasiliev A. L. Grigoryev T. E. Korovin A. N. Belousov S. I. Molchanov S. P. Yurasik G. A. Vul’ A. Ya. 《Crystallography Reports》2019,64(5):817-822
Crystallography Reports - The formation of thin-film coatings from detonation nanodiamond (DND) suspensions on atomically ordered conducting Ni–W substrates by self-assembly in an evaporating... 相似文献
114.
A. Molchanov U. Hilburger J. Friedrich M. Finkbeiner G. Wehrhan G. Müller 《Crystal Research and Technology》2002,37(1):77-82
Large calcium fluoride (CaF2) single crystals are required for the fabrication of lenses in so‐called wafer‐steppers of future IC‐lithography technologies operating at 193 nm and 157 nm. Numerical simulation plays an important role to design an adequate growth setup and processing conditions for the growth of high quality crystals. An important issue is the consideration of the internal heat transfer by radiation in the semitransparent CaF2 during the crystal growth process. Results of the numerical modeling of the heat transport are presented, which are obtained by using the software package CrysVUn++ with different models considering the internal heat transport in CaF2. To improve the availability of experimental data on CaF2 bulk growth, an especially designed R&D‐facility was built. This growth system is equipped with a variety of in‐situ measurement systems to detect the temperature distributions in the crystal and melt region. Calculated temperature distributions are compared with experimental data. Also first results on single crystal growth will be reported. 相似文献
115.
An acousto-optic tunable filter that is insensitive to the polarization of incident light is studied both theoretically and experimentally. The fundamental possibility of designing an acousto-optic filter of nonpolarized light is demonstrated. The filter operates in the visible range of electromagnetic waves with λ=480–750 nm and provides a high spatial and temporal resolution. The number of resolvable spots of the filtered image reaches a value of 400×400 with the spectral bandwidth of the device being Δλ=1.7 nm. The results of the processing of optical images formed by arbitrarily polarized light beams are discussed. An acousto-optic filter based on a TeO2 crystal can be used in optics and spectroscopy in the processing of light beams with an arbitrary polarization, as well as in analyzing optical images formed by light beams whose polarization varies with time. 相似文献
116.
It is shown that mechanochemical activation is efficient in creating waste-free energy-saving methods for the preparation of hydride catalysts, heteropoly acid catalysts, and catalysts for hydrocarbon decomposition into hydrogen and carbon materials, as well for the syntheses of earlier unknown catalytic systems. The capabilities of the mechanochemical methods are demonstrated on modifying the catalytic properties of catalysts and supports: an increase in the strength and catalytic activity, sorption properties, etc. Adhesion theory applied to melts helps to describe the mechanism of mechanochemical synthesis of catalytic systems. 相似文献
117.
Ella M. Moroz Ella M. Moroz Kristina I. Shefer Kristina I. Shefer Dmitry A. Zyuzin Dmitry A. Zyuzin Aleksandra S. Ivanova Aleksandra S. Ivanova Eugenia V. Kulko Eugenia V. Kulko Vasily V. Goidin Vasily V. Goidin Viktor V. Molchanov Viktor V. Molchanov 《Reaction Kinetics and Catalysis Letters》2006,87(2):367-375
Summary The structure of pseudoboehmite was studied by the method of wide-angle X-ray scattering (WAXS). The samples of pseudoboehmite
with various characteristics produced by different methods were examined in order to obtain the most complete information
about their structure. In contrast to reference data, it was found that modifications in the structure of pseudoboehmite layers
occur viathe insertion of additional water molecules. 相似文献
118.
119.
Sulyanova E. A. Molchanov V. N. Verin I. A. Sulyanov S. N. Sobolev B. P. 《Crystallography Reports》2009,54(3):516-525
Crystallography Reports - The crystal structure of the ordered phase Sr4Lu3F17 prepared by directed crystallization of the melt has been investigated. The crystals have a trigonally distorted... 相似文献