全文获取类型
收费全文 | 99篇 |
免费 | 2篇 |
专业分类
化学 | 84篇 |
力学 | 4篇 |
物理学 | 13篇 |
出版年
2022年 | 1篇 |
2021年 | 4篇 |
2020年 | 3篇 |
2019年 | 3篇 |
2018年 | 11篇 |
2017年 | 3篇 |
2016年 | 9篇 |
2015年 | 1篇 |
2014年 | 2篇 |
2013年 | 5篇 |
2012年 | 9篇 |
2011年 | 4篇 |
2010年 | 3篇 |
2009年 | 4篇 |
2008年 | 7篇 |
2007年 | 5篇 |
2006年 | 2篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 1篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1992年 | 2篇 |
1991年 | 3篇 |
1989年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 2篇 |
1978年 | 3篇 |
排序方式: 共有101条查询结果,搜索用时 15 毫秒
1.
V. I. Evreinov V. E. Baulin Z. N. Vostroknutova Z. V. Safronova I. B. Krashakova V. Kh. Syundyukova E. N. Tsvetkov 《Russian Chemical Bulletin》1991,40(9):1759-1766
Stability constants of complexes of alkali-metal cations with oligoethylene glycol diethers RO(CH2CH2O)nR (n=1–5), where R=2-Ph2P(O)C6H4 and 2-Ph2(O)-4-t-BuC6H3P, have been determined conductometrically in a tetrahydrofuran-chloroform mixture (41 by volume). The dependence of complexing ability on a number of monopodand donor centers for Li+ and Na+ has multiple extrema. For K+, Rb+, and Cs+ the complexing abilities steadily increase with the length of the ligand polyether chain. Monopodands based on triethylene glycol and its pyrocatechol analog are highly effective (log K=6.7–7.0) with respect to Li+. The synthesis of ligands with a lipophilic tert-butyl substituent in the terminal group is described.For previous communication, see [1]. The number of the communication in [2] is 5, not 4 as printed in error.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1992–2000, September, 1991. 相似文献
2.
Concentrations of propagating species (PS) and chain propagation constants (kp) were determined for the polymerizations of ethylene, propylene, butene-1 and hexene-1 using TiCl4/MgO-Al(C2H5)3 (i) and TiCl4/Al2O3. SiO2-Al(C2H5)3 (II) catalytic systems. The concentrations of propagating species for all monomers and a particular catalytic system are close. They give an idea of high degree of application of transition metal ( of total Ti for system I and for system II). Values of kp for ethylene, propylene, butene-1, hexene-1 at 70° for system I are 2440 ± 240, 4.8 ± 0.5, 4.6 ± 0.5 and 2.5 ± 0.3 l/mol·sec respectively. For system II, kp values for the first three monomers are 110 ± 11, 1.0 ± 0.1 and 0.13 ± 0.01 l/mol·sec. These results indicate the relation of reactivity of propagating species and chemical nature of the support to the surface of which they are fixed. Rate constants for chain transfer to monomer or triethyl aluminium and spontaneous disproportionation (at 70°) were compard for the polymerizations of ethylene and propylene using catalytic system I. 相似文献
3.
Turanov A. N. Karandashev V. K. Baulin V. E. Baulin D. V. 《Russian Journal of General Chemistry》2021,91(5):850-856
Russian Journal of General Chemistry - New phosphonium ionic liquids, alkyldiphenylethylphosphonium bis[(trifluoromethyl)sulfonyl]imides (Alk = C4H9, C8H17, and C12H25) have been synthesized. The... 相似文献
4.
V. E. Baulin I. S. Ivanova E. N. Pyatova O. V. Kovalenko V. V. Chernyshov A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2012,57(11):1443-1448
The ion-selective properties of 1,5-bis[2-(hydroxyethoxyphosphoryl)phenoxy]-3-oxapentane H2R2 have been described. The molecular and crystal structure of H2R2 has been determined by powder X-ray crystallography and IR spectroscopy. The molecule has the twofold symmetry axis, orthorhombic crystal system, space group Pbcn, a = 16.830(2) ?, b = 8.866(15) ?, c = 15.7190(2) ?, V = 2346.1(6) ?3, Z = 4. A new CuR2 · 2H2O complex has been synthesized and characterized. 相似文献
5.
E. N. Pyatova I. N. Polyakova I. S. Ivanova E. S. Krivorot’ko E. N. Galkina V. E. Baulin A. Yu. Tsivadze 《Russian Journal of Inorganic Chemistry》2017,62(4):431-438
New complexes of cadmium iodide with 1,3-bis[2-(diphenylphosphoryl)phenoxy]propane [CdL0I2], 1,2-bis[2-(diphenylphosphorylethyl)phenoxy]ethane [CdL1, 2I2], and 1,8-bis[2-(diphenylphosphorylethyl) phenoxy]-3,6-dioxaoctane [CdL3, 2I2] are synthesized and their IR spectra and crystal structures are studied. Electroanalytical characteristics of membranes of ion-selective electrodes based on L0, L1, 2, L3, 2, and known crown ethers are compared for cations of alkali, alkaline-earth, and transition metals. Ligand L3, 2 is the first podand with terminal diphenylphosphoryl fragments to exhibit selectivity with respect to the cadmium cation. 相似文献
6.
Mitrofanov Iu. A. Maruk A. Ya. Larenkov A. A. Kodina G. E. Lunev A. S. Luneva K. A. Klementyeva O. E. Tsebrikova G. S. Baulin V. E. Ragulin V. V. Tsivadze A. Yu. 《Russian Journal of General Chemistry》2020,90(3):390-397
Russian Journal of General Chemistry - The binding of 68Ga to two organic ligands containing aminodiphosphonic groups (1,7-diamino-4-oxaheptane-1,1,7,7-tetraphosphonic and... 相似文献
7.
G. S. Tsebrikova V. V. Ragulin V. E. Baulin K. E. German A. O. Malysheva O. E. Klement’eva G. E. Kodina A. A. Larenkov E. A. Lyamtseva N. A. Taratonenkova M. V. Zhukova A. Yu. Tsivadze 《Russian Journal of General Chemistry》2018,88(9):1780-1785
A modified method for the preparation of 2,5-diamino-5,5-diphosphonovaleric acid (DADP5) has been developed in the search for new synthetically available organic ligands to produce 188Re radiopharmaceuticals with an increased accumulation in the bone tissue. Interaction of the obtained acid with 188Re was studied by radio-TLC. An optimal system for separating unbound 188Re and labeled complex in a yield of at least 95% was found. The biological distribution of 188Re-DADP5 was studied based on direct radiometric data. The osteotropicity of 188Re-DADP5 and its increased accumulation in bone fracture sites, which represent oncological pathology models, was detected at a level comparable to known radiopharmaceuticals. 相似文献
8.
A. Yu. Tsivadze L. Kh. Minacheva I. S. Ivanova V. E. Baulin E. N. Pyatova V. S. Sergienko 《Russian Journal of Inorganic Chemistry》2008,53(4):545-551
The syntheses of the complex copper salt CuL2 · 2H2O (I) and the erbium nitrate complex Er(NO3)3 · 2HL · 2H2O (II) (HL is 2-[2′-(oxymethyldiphenylphosphinyl)phenyldiazenyl]-4-tert-butylphenol) have been described. Basic vibrational frequencies in the IR spectra of I and II have been interpreted. The crystal structure of I has been determined by X-ray crystallography: the crystals are monoclinic, a = 15.157(3) ?, b = 17.080(2) ?, c = 22.451(9) ?, β = 106.09(3)°, V = 5584(3) ?3, Z = 4, space group C2/c, R = 0.0546 (for 1152 reflections with I > 2σ(I)). The coordination polyhedron of the copper atom (symmetry C
2) can be described as a symmetrically elongated square bipyramid (4+2). The basic square of the Cu polyhedron is formed by
the oxygen atom of the substituted phenol and one of the nitrogen atoms of the azo group of each of the two deprotonated ligands
L− (Cu-N, 1.969(6) ?; Cu-O, 1.899(5) ?). The angles between the opposite O and N atoms are 157.6°, and the other equatorial
angles are in the range 90.6°–95.9°. The axial positions are occupied by the anisole O(2) and O(2A) atoms (Cu-O, 2.737(6)
?, the O(2)Cu(1)O(2A) angle, 132.3°). In the crystal of I, complex molecules and water molecules of crystallization are combined by a system of hydrogen bonds. IR spectra show that,
in complex II, as distinct from compound I, the HL ligand is coordinated to the erbium atom through the phosphoryl oxygen atom.
Original Russian Text ? A.Yu. Tsivadze, L.Kh. Minacheva, I.S. Ivanova, V.E. Baulin, E.N. Pyatova, V.S. Sergienko, 2008, published
in Zhurnal Neorganicheskoi Khimii, 2008, Vol. 53, No. 4, pp. 601–607. 相似文献
9.
A. N. Turanov V. K. Karandashev V. E. Baulin 《Russian Journal of Inorganic Chemistry》2008,53(6):970-975
The partition of microamounts of lanthanide chlorides (Ln = La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y) between aqueous HCl and organic solutions of tetraphenylmethylenediphosphine dioxide, diphenyl(diethylcarbamoylmethyl)phosphine oxide, and dibutyl(diethylcarbamoylmethyl)phosphine oxide was studied in the presence of ionic liquids (ILs): 1-butyl-3-methylimidazolium hexafluorophosphate and 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide. The stoichiometry of extracted complexes was determined. The effect of the aqueous HCl concentration, the nature of the extractant, and the organic diluent on the efficiency of lanthanide extraction was studied. 相似文献
10.
G. S. Tsebrikova V. E. Baulin I. P. Kalashnikova V. V. Ragulin V. O. Zavel’skii G. E. Kodina A. Yu. Tsivadze 《Russian Journal of General Chemistry》2016,86(3):639-644
1,7-Diamino-4-oxypentane-1,1,7,7-tetraphosphonic acid has been synthesized while searching for potential components for 153Sm radiopharmaceuticals. Its interaction with samarium(III) cation has been studied by 13C and 31P NMR spectroscopy in comparison with 1,5-diamino-3-oxypentane-N,N'-tetra-(methylenephosphonic acid) which is the ligand component of the osteotropic drug Samarium 153Sm oxabifore. NMR spectroscopy provides a simple, convenient, and informative method for studying interactions between the ligand and prospective radionuclide cation. 相似文献