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31.
A. A. Trifonov D. M. Lyubov E. A. Fedorova G. G. Skvortsov G. K. Fukin Yu. A. Kurskii M. N. Bochkarev 《Russian Chemical Bulletin》2006,55(3):435-441
The insertion of N,N′-dicyclohexylcarbodiimide at one of the Y-N bonds of the [(Me3Si)2N]3Y complex in toluene at 70 °C afforded the monoguanidinate diamide derivative { (Me3Si)2NC(N-cyclo-Hex)2}Y[N(SiMe)3]2 (1) (cyclo-Hex is cyclohexyl) in 72% yield. The reaction of equimolar amounts of sodium N,N′-dicyclohexyl-N″-bis(trimethylsilyl)guanidinate, which was prepared in situ from {(Me3Si)2N}Na and N,N′-dicyclohexylcarbodiimide, and YbI2(THF)2 in THF gave the [{(Me3Si)2NC(N-cyclo-Hex)2}YbI(THF)2]2 complex (2). An attempt to use this procedure for the synthesis of the yttrium compound { (Me3Si)2NC(NSiMe3)2}2YCl containing the sterically more hindered guanidinate ligand unexpectedly led to the formation of the diamide chloride complex [{(Me3Si)2N}2Y(THF)(µ-Cl)]2 (3). The structures of complexes 1–3 were established by X-ray diffraction. Compound 1 is mononuclear. Complexes 2 and 3 are dinuclear and contain two µ2-bridging halide ligands. 相似文献
32.
A. I. Poddel’sky I. V. Smolyaninov N. N. Vavilina Yu. A. Kurskii N. T. Berberova V. K. Cherkasov G. A. Abakumov 《Russian Journal of Coordination Chemistry》2012,38(4):284-294
A series of new binuclear bis(catecholate) antimony(V) complexes based on 1,1′-spirobis[3,3-dimethylindanequinone-5,6] with
various substituents at the central antimony atoms, R3Sb(Cat-Spiro-Cat)SbR3 (I–IV) and R3Sb(CatBr-Spiro-BrCat)SbR3 (V–VIII) (R = p-fluorophenyl, phenyl, p-tolyl, and ethyl), were synthesized. Spirobis(catecholates) I–III exhibit two one-electron oxidation waves on the cyclic voltammograms, whereas bromo-substituted spirobis(catecholates) V–VII undergo two-electron oxidation immediately at the first stage. The two-electron oxidation of the complexes results in the
loss of one of the organoantimony fragments and the formation of mononuclear catecholate-quinone complexes (Q-Spiro-Cat)SbR3 or (QBr-Spiro-BrCat)SbR3, respectively. An insignificant delocalization of the charge and spin between two redox centers is observed in the complexes.
The nature of substituents at the antimony atom exerts an effect on the values of redox potentials of the complexes: more
donating groups decrease the oxidation potentials of the catecholate fragments and more withdrawing groups increases these
values. 相似文献
33.
A. A. Trifonov E. N. Kirillov Yu. A. Kurskii M. N. Bochkarev 《Russian Chemical Bulletin》2000,49(4):744-746
The reactions of ytterbium naphthalene complex C10H8Yb(THF)2 with 2-cyclopentadienylethanol, 1-cyclopentadienylpropan-2-ol, 3-cyclopentadienyl-1-butoxypropan-2-ol, and cyclopentadienyldimethylsilyl-tert-butylamine were studied. The bivalent ytterbium complexes with chelate bifunctional cyclopentadienyl ligands [(η5−C5H5)CH2CH2(η1−O)]Yb(THF), [(η5−C5H5)CH2CH2(η1−O)]Yb(DME). [(η5−C5H5)CH2CH(Me)(η1−O)]Yb(THF), [(η5−C5H5)CH2CH(CH2OC4H9)(η1−O)]Yb(THF), and [(η5−C5H5)SiMe2(η1−N(Bu1))]Yb(THF) were obtained and characterized.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 742–745, April, 2000. 相似文献
34.
Semenycheva L. L. Geras’kina E. V. Matkivskaya Yu. O. Moikin A. A. Kurskii Yu. A. 《Russian Journal of Applied Chemistry》2015,88(10):1686-1691
Russian Journal of Applied Chemistry - Copolymers of vinyl butyl ethers and alkyl methacrylates may find use as resource-saving viscosity modifiers of oils that is due to a new approach to their... 相似文献
35.
Trifonov A. A. Kurskii Yu. A. Bochkarev M. N. Muehle S. Dechert S. Schumann H. 《Russian Chemical Bulletin》2003,52(3):601-606
Oxidation of (C5Me5)2Yb(THF)2 with diazabutadiene ButN=CHCH=NBut (DAD) afforded the (C5Me5)2Yb(ButNCHCHNBut) complex (1). The magnetic measurements and X-ray diffraction study confirmed the trivalent state of the ytterbium atom and the radical nature of the DAD ligand in complex 1. The oxidation state of ytterbium in the (C5Me5)2YbDAD—solvent system depends on the coordinating properties of the solvent, whereas the ytterbium atom in the Cp2YbDAD complex (2) remains trivalent regardless of the solvent nature. In complex 2, the redox replacement of DAD·– with 9-fluorenone accompanied by the pinacol dimerization of 9-fluorenone and detachment of one Cp ligand from the ytterbium atom gave rise to the dimeric [CpYb(2-OC13H8-C13H8O)(THF)]2 complex (3). The structure of complex 3 was established by X-ray diffraction analysis. 相似文献
36.
Yu. A. Kurskii A. S. Shavyrin T. I. Kulikova V. A. Kuropatov G. A. Abakumov 《Russian Journal of General Chemistry》2018,88(8):1584-1589
Formation of protonated 3,4,6-triisopropylsemiquinone radicals in solution of a mixture of 3,4,6- triisopropyl-о-benzoquinone and 3,4,6-triisopropylcatechol was shown using ESR spectroscopy. Heating the mixture to 110°С leads to the formation of the condensation products, additional amount of 3,4,6-triisopropylcatechol, and evolution of propylene. Mathematical simulation of the kinetics of the reaction was performed. 相似文献
37.
G. A. Abakumov V. I. Nevodchikov N. V. Zaitova N. O. Druzhkov L. G. Abakumova Yu. A. Kurskii V. K. Cherkasov 《Russian Chemical Bulletin》1997,46(12):2093-2095
The reaction of 3,6-di-tert-butyl-o-benzoquinone with dimedone in the presence of a catalytic amount of Et3N occurs as repeated 1,4-nucleophilic addition-oxidation and isomerization of a tricyclic quinone into quinomethane. The intermediate
products were isolated and characterized. Semiquinone complexes of quinones were studied by ESR in solution.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2206–2209, December, 1997. 相似文献
38.
D. G. Cherkasov V. F. Kurskii S. I. Sinegubova K. K. Il’in 《Russian Journal of Inorganic Chemistry》2009,54(6):969-973
Phase equilibria and critical phenomena in the cesium nitrate-water-isopropanol system, where the liquid binary subsystem
does not separate over the entire temperature range of its liquid state, were studied within 70–120°C using visual polythermal
analysis. The temperature at which the monotectic critical tie-line appears (79.0°C) and the compositions of the solutions
at critical solution points at various temperatures were determined. Isopropanol distribution coefficients between aqueous
and organic monotectic phases were calculated for five temperatures. The salting out of isopropanol by cesium nitrate from
aqueous solutions is enhanced by temperature elevation. The phase isotherms validated a previously reported fragment of the
general scheme of the topological transformation of ternary phase diagrams for salt-binary solvent systems with salting out.
Original Russian Text ? D.G. Cherkasov, V.F. Kurskii, S.I. Sinegubova, K.K. Il’in, 2009, published in Zhurnal Neorganicheskoi
Khimii, 2009, Vol. 54, No. 6, pp. 1032–1036. 相似文献
39.
Ladilina E. Yu. Semenov V. V. Mushtina T. G. Lopatin M. A. Kurskii Yu. A. Kirillov A. I. Domrachev G. A. 《Russian Chemical Bulletin》2002,51(12):2277-2285
Hexakis[bis(2-aminoethoxy)methylsilylethyl]benzene and hexakis[bis(N,N-dimethyl-2-aminoethoxy)methylsilylethyl]benzene C6[(NR2CH2CH2O)2SiMeCH2CH2]6 (4, R = H; 5, R = Me) were prepared from hexakis(methyldichlorosilylethyl)benzene C6(Cl2MeSiCH2CH2)6 and 2-aminoethanol or N,N-dimethyl-2-aminoethanol, respectively. Compounds 4 and 5 react with anhydrous cobalt (ii) chloride to give poorly soluble dodecachloro{hexakis[bis(2-aminoethoxy)methylsilylethyl]benzene}hexacobalt and dodecachloro{hexakis[bis(N,N-dimethyl-2-aminoethoxy)methylsilylethyl]benzene}hexacobalt {Co6[(NR2CH2CH2O)2SiMeCH2CH2]6C6}Cl12 (R = H or Me), respectively. Polyfunctional amine 4 reacts with dicobalt octacarbonyl to produce hexakis[bis(2-aminoethoxy)methylsilylethyl]benzenedicobalt(ii) tetrakis(tetracarbonylcobaltate) {Co2[(NH2CH2CH2O)2SiMeCH2CH2]6C6}[Co(CO)4]4. N,N-Dimethyl-substituted polyfunctional amine 5 is lowly reactive in the reaction with Co2(CO)8, whereas the simplest model of this compound, viz., bis(N,N-dimethyl-2-aminoethoxy)dimethylsilane (NMe2CH2CH2O)2SiMe2, slowly reacts with Co2(CO)8 to give tris[bis(N,N-dimethyl-2-aminoethoxy)dimethylsilane]cobalt(ii) bis(tetracarbonylcobaltate) {Co[(NMe2CH2CH2O)2SiMe2]3}[Co(CO)4]2. Thermal decomposition and transformations of the resulting complexes under the action of oxygen and water were studied. 相似文献
40.
L. N. Bochkarev A. V. Nikitinskii A. A. Skatova Yu. E. Begantsova V. I. Shcherbakov I. P. Malysheva G. V. Basova G. K. Fukin Yu. A. Kurskii S. Ya. Khorshev Yu. P. Barinova G. A. Abakumov 《Russian Chemical Bulletin》2005,54(3):606-609
New silicon-, germanium-, and tin-containing imido-alkyl molybdenum complexes (ArN)2Mo(CH2EMe3)2 (Ar is 2,6-diisopropylphenyl; E = Si (1), Ge (2), Sn (3)) were prepared in the crystalline state in 58–66% yields by the reactions of the (ArN)2MoCl2(DME) complex with alkyllithium derivatives Me3ECH2Li (E = Si or Ge) or the Grignard reagents Me3ECH2MgCl (E = Ge or Sn). The structures of complexes 1–3 and the known analog (ArN)2Mo(CH2But)2 (4) were established by X-ray diffraction analysis. Complexes 1–3 were found to be isostructural. The coordination environment about the Mo atom can be described as a distorted tetrahedron. Complex 4 has a similar structure. The Mo-C distance tends to decrease with increasing electron donating ability of the EMe3 group.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 597–600, March, 2005. 相似文献