全文获取类型
收费全文 | 357篇 |
免费 | 2篇 |
专业分类
化学 | 334篇 |
数学 | 3篇 |
物理学 | 22篇 |
出版年
2022年 | 3篇 |
2021年 | 2篇 |
2020年 | 4篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 12篇 |
2016年 | 8篇 |
2015年 | 5篇 |
2014年 | 7篇 |
2013年 | 23篇 |
2012年 | 18篇 |
2011年 | 15篇 |
2010年 | 21篇 |
2009年 | 14篇 |
2008年 | 22篇 |
2007年 | 23篇 |
2006年 | 18篇 |
2005年 | 21篇 |
2004年 | 15篇 |
2003年 | 11篇 |
2002年 | 12篇 |
2001年 | 10篇 |
2000年 | 9篇 |
1999年 | 4篇 |
1998年 | 5篇 |
1997年 | 3篇 |
1996年 | 2篇 |
1992年 | 3篇 |
1991年 | 9篇 |
1990年 | 6篇 |
1989年 | 2篇 |
1988年 | 5篇 |
1987年 | 5篇 |
1986年 | 2篇 |
1985年 | 8篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 4篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
1975年 | 1篇 |
1973年 | 1篇 |
1969年 | 1篇 |
1965年 | 1篇 |
排序方式: 共有359条查询结果,搜索用时 602 毫秒
11.
Z. A. Starikova A. I. Yanovsky Yu. T. Struchkov S. V. Zubkov I. I. Seifullina 《Russian Chemical Bulletin》1996,45(9):2157-2162
The crystal structure of the product of the condensation of (salicylideneamino)nitroguanidine with salicylaldehyde on a Ni2+ ion template, K[Ni(C15H10N5O4)] · DMF, has been studied. It was established that a planar Ni complex, consisting of isolated [NiL]– anions and solvated [K+ · DMF] cations, is formed. The negative charge of the anion is localized mainly on the O atoms of the nitro group. The nitroguanidine fragment of the ligand occurs in the tautomeric form, which was not reported previously.Deceased in 1995Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 2273–2277, September, 1996. 相似文献
12.
L. A. Chetkina A. N. Sobolev V. K. Bel'skii V. E. Zavodnik I. G. Arzamanova Ya. V. Gurvich O. F. Starikova 《Journal of Structural Chemistry》1991,32(5):766-768
L. Ya. Karpov Scientific-Research Physicochemical Institute. Scientific-Research Institute of Rubber and Latex Goods. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 5, pp. 162–164, September–October, 1991. 相似文献
13.
A. G. Matveeva E. I. Matrosov Z. A. Starikova G. V. Bodrin S. V. Matveev P. V. Petrovskii E. E. Nifant’ev 《Russian Chemical Bulletin》2005,54(11):2519-2534
The trifunctional ligand, 2,6-bis(diphenylphosphorylmethyl)-4-methylphenol (L
2), forms complexes with cerium(III) nitrate having a ligand to metal ratio of 1: 1, 2: 1, and 3: 1. The structures of these complexes in the solid state and
in solution were studied by X-ray diffraction, IR and NMR (1H and 31P) spectroscopy, and conformational analysis (molecular mechanics). The 2: 1 complexes of L
2 with lanthanum(III) and neodymium(III) nitrates were synthesized and characterized. In all complexes, the neutral ligand is coordinated through both phosphoryl
oxygen atoms. The hydroxy oxygen atom is coordinated only in some complexes, and the hydrogen atom of the hydroxy group is
involved in hydrogen bonding. The compositions and structures of the resulting complexes depend on the method of synthesis
and the nature of solvent. The ligand was found to undergo easy inner-sphere oxidation. The structure of one of the transformation
products was established by X-ray diffraction. Unlike the coordinated ligand, the free ligand is very stable to oxidation.
Dedicated to Corresponding Member of the Russian Academy of Sciences T. A. Mastryukova.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2440–2454, November, 2005. 相似文献
14.
T. F. Sysoeva Z. A. Starikova S. D. Ershova N. M. Dyatlova 《Journal of Structural Chemistry》1991,32(2):293-296
All-Union Scientific-Research Institute of Chemical Reagents and Ultrapure Chemical Substances. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 2, pp. 163–166, March–April, 1991. 相似文献
15.
Timofeev S. V. Lobanova I. A. Petrovskii P. V. Starikova Z. A. Bregadze V. I. 《Russian Chemical Bulletin》2001,50(11):2245-2247
The reaction of bromine with exo-nido-ruthenacarborane [Cl(Ph3P)2Ru]-5,6,10-(-H)3-10-H-7,8-C2B9H8 (1) led to the replacement of the chlorine atom by the bromine atom in the octahedral environment of the ruthenium atom rather than to the substitution in the carborane cage. The structure of [Br(Ph3P)2Ru]-5,6,10-(-H)3-10-H-7,8-C2B9H8 was established by NMR and IR spectroscopy and X-ray diffraction analysis. 相似文献
16.
Yu. B. Chudinov S. B. Gashev Yu. A. Strelenko Z. A. Starikova M. Yu. Antipin V. V. Semenov 《Russian Chemical Bulletin》2007,56(1):140-147
Model diastereomeric oxazolidinones containing various substituents at positions 3 and 5 were synthesized. Several individual
diastereomers bearing methyl groups at positions 4 and 5 in cis-and trans orientations were isolated. The TLC and 1H NMR spectroscopic data suggest that diastereomers, particularly those containing the aryl substituent at position 5, are
substantially different in the physical and spectral properties. The configurations of some diastereomers were established
by X-ray diffraction and NOESY spectroscopy. For these compounds, the reliable assignment of the characteristic 1H NMR signals of individual groups was made, which provided evidence for the cis or trans orientation of the methyl groups at positions 4 and 5. The scope of the method as applied to the determination of the cis and trans isomers from their 1H NMR spectra is discussed.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 133–139, January, 2007. 相似文献
17.
I. A. Charushnikova A. M. Fedoseev Z. A. Starikova 《Russian Journal of Coordination Chemistry》2005,31(8):603-607
The crystal structure of Na3NpO2(OOCCH3)3ClO4 · H2O was studied by single-crystal X-ray diffraction method. The structure is composed of the complex anions NpO2(OOCCH3)3]2−, perchlorate anions, Na cations, and water molecules. The oxygen environment of Np(V) is a hexagonal bipyramid whose equatorial plane is formed by the oxygen atoms of three acetate ions. In addition to the acetate anions, the structure contains the perchlorate ion whose oxygen atoms, except for one, are included in the coordination environment of Na+ cations.__________Translated from Koordinatsionnaya Khimiya, Vol. 31, No. 8, 2005, pp. 636–640.Original Russian Text Copyright © 2005 by Charushnikova, Fedoseev, Starikova. 相似文献
18.
Koridze A. A. Zdanovich V. I. Lagunova V. Yu. Petukhova I. I. Dolgushin F. M. Starikova Z. A. Ezernitskaya M. G. Petrovskii P. V. 《Russian Chemical Bulletin》2002,51(5):876-886
The thermal reaction of Ru3(CO)10(-Ph2PCH2PPh2) (1) with enyne PhCH=CHCCPh afforded the trinuclear ruthenium clusters Ru3(CO)6{3-P(Ph)CH2PPh2}{3-C(Ph)=CHCC(Ph)(1,2-C6H4)C(=0)} (2), Ru3(-H)(CO)5{3-P(Ph)CH2PPh2}{3-C(Ph)=CHCC(Ph)(1,2-C6H4)C(—0)} (3), and Ru3(CO)6(-CO){3-P(Ph)CH2PPh2}{3-C(C=CPh2)CH=C(H)Ph} (4) and also two isomers of Ru3(CO)5(-CO)(-Ph2PCH2PPh2){3-C4Ph2(CH=CHPh)2} (5a and 5b). Clusters 2, 3, and 4 were characterized by IR spectroscopy, 1H and 31P NMR spectroscopy, and X-ray diffraction analysis. The reaction of complex 1 with enyne FcCH=CHCCFc gave rise to the Ru3(CO)6{3-P(Ph)CH2PPh2}{3-C(Fc)=CHCC(Fc)(1,2-C6H4)C(=0)} (6) and Ru3(-H)(CO)5{3-P(Ph)CH2PPh2}{3-C(Fc)=CHCC(Fc)(1,2-C6H4)C(—0)} (7) clusters. According to the spectral data, the latter compounds are isostructural to complexes 2 and 3, respectively. 相似文献
19.
Skripnikova Tatiana A. Starikova Anna A. Shumilova Galina I. Ermolenko Yuri E. Pendin Andrey A. Mourzina Yulia G. 《Journal of Solid State Electrochemistry》2017,21(8):2269-2279
Journal of Solid State Electrochemistry - We report a new type of solid-state electrode (type I) of a simple design with polyvinyl chloride membranes based on Mn(III) tetraphenylporphyrin and with... 相似文献
20.
Quantum chemical study of mixed-ligand (1: 1) adducts of tetracoordinated cobalt complexes (diketonates, bis-aminovinylketonates, and bis-salicylaldiminates) with pyrene-4,5-diimines using density functional theory (DFT B3LYP*/6-311++G(d,p)) revealed compounds possessing valence tautomeric properties. The mechanisms of intramolecular electron transfer accompanied by changing magnetic properties of the complexes under consideration were studied. It was shown that the variation of substituents at the nitrogen atoms of the diimine ligand and the donor groups in the cobalt bischelate, as well as the annulation of five- and six-membered rings to the azomethine fragment exerts a considerable influence on the stability of the formed adducts and the energy difference between their low- and high-spin isomers. 相似文献