排序方式: 共有122条查询结果,搜索用时 171 毫秒
51.
Alexander N. Solodukhin Yuriy N. Luponosov Mikhail I. Buzin Svetlana M. Peregudova Evgeniya A. Svidchenko Sergei A. Ponomarenkoa 《Mendeleev Communications》2018,28(4):415-417
Highly stable unsymmetrical donor–acceptor oligothiophenes equipped with terminal electron-donating triphenylamine and an electron-withdrawing phenyldicyanovinyl groups have been synthesized. An influence of the length of conjugated oligothiophene π-spacer between the donor and acceptor blocks on solubility, thermal, optical and electrochemical properties of such compounds has been revealed. 相似文献
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Chesnokov V. V. Lisitsyn A. S. Sobolev V. I. Gerasimov E. Yu. Prosvirin I. P. Chesalov Yu. A. Chichkan A. S. Podyacheva O. Yu. 《Kinetics and Catalysis》2021,62(4):518-527
Kinetics and Catalysis - The properties of a new catalytic Pt/N-graphene system in the gas-phase reaction of formic acid decomposition for the production of pure hydrogen were studied. Graphene... 相似文献
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M. G. Ivanov A. N. Shmakov V. A. Drebushchak O. Yu. Podyacheva 《Journal of Thermal Analysis and Calorimetry》2010,100(1):79-82
Perovskite SrCo0.6Fe0.2Nb0.2O3-z attracts attention as a promising material with high oxygen conductivity. The sample was investigated by means of high-temperature
X-ray powder diffraction and thermogravimetry. Phase transition was detected near 400 °C and accompanied with significant
mass loss. The phase transition affects oxygen mobility, important for the synthesis of oxygen permeable membranes. The unit
cell parameters are proved to change with temperature after two effects (1) reversible conventional thermal expansion and
(2) irreversible contraction-expansion due to the changes in the oxygen content. In situ high-temperature X-ray diffraction
experiments allowed us to separate the contributions and to measure them as a function of temperature. 相似文献
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T Ebert G Cox E Sheremet O Gordan DR Zahn F Simon S Spange 《Chemical communications (Cambridge, England)》2012,48(79):9867-9869
Defect-free microporous carbon layers on graphite can be produced by DABCO-catalyzed twin polymerization of 2,2'-spirobi[4H-1,3,2-benzodioxasiline] in a slurry polymerization and subsequent thermal transformation of the resulting phenolic resin into carbon. 相似文献
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Vyacheslav E. Semenov Evgeniya S. KrylovaIrina V. Galyametdinova Alla V. ChernovaSergey V. Kharlamov Shamil K. LatypovVladimir S. Reznik 《Tetrahedron》2011,67(38):7370-7378
Replacement of terminal atoms of Br in 1,3-bis(bromopentyl)-5(6)-substituted uracils with 2-mercapto-5-methyl-1,3,4-thiadiazole, 2,5-dimercapto-1,3,4-thiadiazole, 2-mercaptoimidazole, and 2-mercaptobenzimidazoles resulted in a series of acyclic compounds and isomeric heterocyclophanes. Structures of macrocyclic regioisomers were unambiguously determined by NMR data. One of the regioisomers exhibits a hypochromic effect with respect to model compounds. The acyclic uracils obtained bridged with five-membered heterocycles are alkylated with methyliodide and methyl tosylate, and oxidated with m-CPBA, H2O2, and I2. 相似文献
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Mondal S van Smaalen S Schönleber A Filinchuk Y Chernyshov D Simak SI Mikhaylushkin AS Abrikosov IA Zarechnaya E Dubrovinsky L Dubrovinskaia N 《Physical review letters》2011,106(21):215502
The peculiar bonding situation in γ boron is characterized on the basis of an experimental electron-density distribution which is obtained by multipole refinement against low-temperature single-crystal x-ray diffraction data. A topological analysis of the electron-density distribution reveals one-electron-two-center bonds connecting neighboring icosahedral B(12) clusters. A unique polar-covalent two-electron-three-center bond between a pair of atoms of an icosahedral cluster and one atom of the interstitial B(12) dumbbell explains the observed charge separation in this high-pressure high-temperature polymorph of boron. 相似文献
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Golovanov Aleksander А. Dan’kov Sergei А. Sokov Sergey А. Melnikov Pavel А. Ukolov Anton I. Voronova Evgeniya D. Vologzhanina Anna V. Bunev Aleksander S. 《Chemistry of Heterocyclic Compounds》2019,55(1):93-96
Chemistry of Heterocyclic Compounds - 5-Aryl-2-carboxy-5-(pyridin-1-ium-1-yl)penta-2,4-dienoates, previously unknown pyridine betaines, were formed in 32–70% yields as a result of the... 相似文献
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