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1.
Zusammenfassung Mo3CoB3, Mo3NiB3, W3CoB3 und W3NiB3 kristallisieren in einem eigenen Typ (W3CoB3-Struktur). Das trigonal prismatische Bauelement [T
6B]* ist zu Ketten vereinigt, wobei B3-Gruppen entstehen. Die Phasen sind vermutlich Bor-reicher als obiger Formel entspricht.
Mit 2 Abbildungen 相似文献
The crystal structure of W3CoB3 and the isotypic phases Mo3CoB3, Mo3NiB3, and W3NiB3
Mo3CoB3, Mo3NiB3, W3CoB3, and W3NiB3 were found to possess a new type of crystal structure (W3CoB3-structure type). Trigonal prismatic groups [T 6B]* are linked together forming chains in such a way that B3-groups occur. These borides do probably exist with a larger amount of boron as to compared with the formula.
Mit 2 Abbildungen 相似文献
2.
γ-Nitro-γ-butyrolactone By oxidation of 3-(1-nitro-2-oxocyclohexyl)propanal ( 1 ) with KMnO4, besides 3-(1′-nitro-2′-oxocyclohexyl)pripionic acid ( 2 ), the complete hydrolysis product 4-oxononanedioic acid ( 4 ) and the oxidized semi-hydrolysis product 5-(2-nitro-5-oxotetrahydro-2-furyl)pentanoic acid ( 3 ) were formed. The crystalline 3 decomposes at r.t. forming 4 and nitrous gases; its structure was established by X-ray determination. 相似文献
3.
γγγ-Trifluorocarbonyl compounds are easily obtained in a good yield by introduction of the 1,1,1-trifluoroethyl moiety (CF3-CH2-) on the -methylene group of a ketone. 相似文献
4.
K3SbSe3, Rb3SbSe3, and Cs3SbSe3 – Synthesis and Crystal Structure The compounds K3SbSe3, Rb3SbSe3 and Cs3SbSe3 were synthesized by heating mixtures of Sb2O3 and an alkalicarbonate in a stream of hydrogen saturated by selenium in a temperature range between 750 °C and 800 °C. The compounds crystallize isostructural with Na3AsS3. A comparison of atomic distances and bond angles with those of the isostructural arsenic and bismuth compounds shows the effect of lone pairs. 相似文献
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Thin films of methylammonium lead halides, CH3NH3PbI3 and CH3NH3PbI3-xClx, were deposited onto symmetrical microstructured electrode arrays of gold or platinum on Si/SiO2 wafers. Polarization studies were carried out on perovskite films under vacuum in the dark. For poling, a constant voltage was applied to the samples while the temperature was cycled between 295 K and 4 K. The measured current densities depending on the temperature showed distinct characteristics relating strongly to the crystal phase and the dielectric properties of the perovskite films. Voltage sweeps were carried out at different scan rates at specific temperature intervals after poling. The polarization of the films due to the migration of iodide vacancies in direction of the blocking perovskite/metal interface was frozen almost up to room temperature. Charge carriers were only able to cross the blocking barrier and contribute to the current where the ions have accumulated during poling. All J-V curves showed hysteresis: inverted and regular hysteresis at room temperature and below, respectively. Inverted hysteresis originates from the slow accumulation of ions at the blocking barrier, while regular hysteresis arises from a distortion in the adjacent crystals which will be discussed. 相似文献
6.
The synthesis of derivatives of 3-amino-3-deoxy-L-erythrose by LAH or LAD reduction of the oxime of 1,2-O-isopropylidene α-L -glycero-tetros-3-ulofuranose is described. 相似文献
7.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1982,38(10):1083-1087
Infrared gas phase spectra of CH3GeH3 and CD3GeH3 have been investigated at a resolution of 0.06 cm−1 and Raman spectra obtained in the liquid phase at low resolution. Several reassignments of the fundamental frequencies are proposed. Q-branch maxima from the five naturally occurring Ge isotopes have been resolved in several of the fundamental vibrations and new values obtained of rotational and Coriolis coupling constants for ν7, ν8, ν10 and ν12 of CH3GeH3 and ν7, ν8, ν9, ν10 and ν12 of CD3GeH3. Germanium isotopic frequency shifts on νGeC are also reported. 相似文献
8.
L. N. Sobenina A. I. Mikhaleva M. P. Sergeeva D. -S. D. Toryashchinova O. B. Kozyreva B. A. Trofimov 《Chemistry of Heterocyclic Compounds》1996,32(1):43-47
Condensation of pyrrole-2-dithiocarboxylates with CH acids containing ester groups, in the KOH-DMSO system, was used to prepare previously unknown 1-alkylthio-3H pyrrolizin-3-ones. The latter, treated with secondary amines, are readily converted to the corresponding 1-amino derivatives. 相似文献
9.
L. N. Sobenina A. I. Mikhaleva M. P. Sergeeva D. -S. D. Toryashinova O. B. Kozyrea B. A. Trofimov 《Chemistry of Heterocyclic Compounds》1996,32(7):783-788
Previously unknown 1-alkylthio-3H-pyrrolizin-3-ones have been obtained by the condensation of pyrrole-2-dithiocarboxylates with CH acids containing ester groupings in the KOH-DMSO system. On treating the products with secondary amines they are readily converted into the corresponding 1-amino derivatives.Irkutsk Branch of the Russian Academy of Sciences, Irkutsk 664033. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 919–924, July, 1996. Original article submitted May 2, 1996. 相似文献
10.
K3BiSe3, Rb3BiSe3, and Cs3BiSe3 – Derivatives of the Th3P4 Structure Type The compounds K3BiSe3, Rb3BiSe3, and Cs3BiSe3 were synthesized by heating mixtures of Bi2O3 and the respective alkalicarbonate in a stream of hydrogen saturated by selenium at 850°C. Thin crystals of the compounds appear red in transmitted light. They crystallize isostructural with Na3AsS3, space group P213, lattice constants a = 9.771(5) Å, a = 10.161(3) Å, and a = 10.587(5) Å for K3BiSe3, Rb3BiSe3, and Cs3BiSe3, respectively. The Na3AsS3 structure type is a derivative of the Th3P4 structure type. 相似文献
11.
Zusammenfassung Es wurden die Enthalpien der Reaktionen von AsCl3, AsBr3, AsJ3, SbCl3, SbBr3 und SbJ3 mit Tributylphosphat, N,N-Dimethylacetamid und Hexamethylphosphorsäuretriamid bestimmt. Das Verhalten der Addukte bei Gegenwart eines Überschusses der Donoren wird beschrieben.
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Acceptor properties of AsCl3, AsBr3, AsI3, SbCl3, SbBr3, and SbI3
The enthalpies of the reactions of AsCl3, AsBr3, AsI3, SbCl3, SbBr3 and SbI3 with tributylphosphate, N,N-dimethylacetamide and hexamethylphosphoric acid triamide were measured. The behavior of the adducts in the presence of excess donor molecules is described.
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13.
《Tetrahedron letters》1987,28(47):5801-5804
Treatment of 3-bromo-3-trifluoromethyldiazirine with fluoride ion produces 3-fluoro-3-trifluoromethyldiazirine in 60% yield. Tetrafluoroethylidene can be trapped upon thermolysis of the diazirine. 相似文献
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Addition of methyl phosphinate to 2(R)-methoxy 3-oxapentanedial gives all eight possible diastereoisomeric 3-phosphapentopyranoses in very poor yield. Structures and stereochemistry are assigned on the basis of 1H, 31P, NMR, and mass spectroscopy of their acetates. © 1996 John Wiley & Sons, Inc. 相似文献
17.
González-del Moral O Martín A Mena M Morales-Varela Mdel C Santamaría C 《Chemical communications (Cambridge, England)》2005,(29):3682-3684
Treatment of the mu3-ethylidyne complex [{TiCp*(mu-O)}3(mu3-CMe)](1), (Cp*=eta5-C5Me5) with alkali metal amides leads to the oxoheterometallocubane derivatives [M(mu3-O)3{(TiCp*)3(mu3-CCH2)}] [M = Li (2), Na (3), K (4), Rb (5), Cs (6)] containing the naked carbanion mu3-CCH2-; the addition of triphenylmethanol and tert-butanol to the compounds 2-6 gives rise to the oxoderivatives [{TiCp*(mu-O)}3(mu-CHMe)(OCR3)][R = Me (7), Ph (8)] which show a mu-ethylidene bridge on the surface model Ti3O3. 相似文献
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E. I. Klimova M. Martinez Garcia T. Klimova L. Ruiz Ramirez N. N. Meleshonkova 《Russian Chemical Bulletin》1999,48(11):2153-2157
3-Cyclobutyl-3-ferrocenylcyclopropene was synthesized by the reactions of mono- or dibromoferrocenylcyclopropanes with ButOK in DMSO. Treatment of dibromoferro-cenylcyclopropane with ButOK in THF afforded 3-cyclobutylidene-3-ferrocenylpropyne in 52% yield. Heterolysis of the C-C bond in the three-membered ring
of 3-cyclobutyl-3-ferrocenylcyclopropene at low and high temperatures was studied. Hydrolysis yielded 3-cyclobutyl-1H-cyclopentaferrocene and products with linear structures,viz., 3-cyclobutylidene-3-ferrocenylpropene,E- andZ-I-ferrocenyl-1-cyclobutylpropenes, and 1-cyclobutylidene-1-ferrocenylacetone. Cyclopropene reacts with 1,3-diphenylisobenzofuran
to form two Diels-Alder adducts, while the enyne does not react with 1,3-diphenylbenzofuran.
Facultad de Quimica, Universidad Nacional Autónoma de México, Cd. Universitaria, C.P. 04510, México D. F., México.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2177–2181, November, 1999. 相似文献