全文获取类型
收费全文 | 68篇 |
免费 | 0篇 |
专业分类
化学 | 38篇 |
力学 | 1篇 |
数学 | 4篇 |
物理学 | 25篇 |
出版年
2018年 | 1篇 |
2017年 | 1篇 |
2012年 | 3篇 |
2011年 | 2篇 |
2010年 | 1篇 |
2009年 | 3篇 |
2008年 | 2篇 |
2007年 | 1篇 |
2006年 | 1篇 |
2004年 | 4篇 |
2003年 | 5篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 4篇 |
1999年 | 7篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1995年 | 3篇 |
1994年 | 5篇 |
1993年 | 4篇 |
1992年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 2篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1979年 | 1篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有68条查询结果,搜索用时 171 毫秒
51.
The 29Si FT NMR characteristics of a number of π organosilyl-transition metal complexes have been determined and their usefulness for characterizing the complexes investigated. 相似文献
52.
Silanes, Me3SiX, and Nucleophiles, Nu, form 1:1 salts, M3eSiNu+X? in solution. The effect of both nucleophile and silane on salt formation has been studied, and the implications for the design of more efficient silylation mixtures are discussed. 相似文献
53.
Acylsilanes undergo a first-order thermal rearrangement to yield products derived from the insertion of an intermediate siloxycarbene into adjacent CH bonds. 相似文献
54.
55.
56.
The 29Si, 13C and 1H NMR spectra of mixtures of Me3SiI and Me3SiOSO2CF3 with DMF in CD2Cl2 show signals that are consistent with the formation of Me3SiOH(NMe2)X? but not with penta- or hexa-coordinate silicon species. The spectra of a mixture of Me3SiBr and DMF show a rapidly exchanging, equilibrium mixture of Me3SiOH(NMe2)Br? and starting materials. No strong evidence for salt formation between DMF and Me3SiCl was obtained. The spectra of Me3SiX (X = I, Br, Cl, OSO2CF3) in CD3CN indicate that neither adduct formation nor extra coordination at silicon is significant. 相似文献
57.
A. G. Shipov E. P. Kramarova T. P. Murasheva O. B. Artamkina Vad. V. Negrebetskii Yu. I. Baukov S. A. Pogozhikh Yu. E. Ovchinnikov M. G. Voronkov A. R. Bassindale P. G. Taylor 《Russian Chemical Bulletin》2006,55(3):579-582
N-(Dimethylfluorosilylmethyl)succinimide (2a) and N-(dimethylfluorosilylmethyl)phthalimide (2b) were synthesized by the Si—N bond cleavage in readily accessible N-(dimethylimidosilylmethyl)imides with BF3 etherate. Analogously, (O→Si)-chelated 1-(dimethylfluorosilylmethyl)-2-pyrrolidone was prepared from 1-(dimethylmorpholinosilylmethyl)-2-pyrrolidone.
X-ray diffraction study demonstrated that the silicon atom in the crystals of 2b is pentacoordinated.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 558–561, March, 2006. 相似文献
58.
S.Yu. Bylikin A.G. Shipov E.P. Kramarova Vad.V. Negrebetsky A.A. Korlyukov Yu.I. Baukov M.B. Hursthouse L. Male A.R. Bassindale P.G. Taylor 《Journal of organometallic chemistry》2009,694(2):244-248
Reactions of O-trimethylsilyl-l-mandelic N,N-dimethylamide (1) with tetrachlorosilane and tetrachlorogermane lead to O,O-monochelate complexes, [1-(dimethylcarbamoyl)-1-phenylmethoxy]trichlorosilane (2) and [1-(dimethylcarbamoyl)-1-phenylmethoxy]trichlorogermane (3). Pentacoordination of silicon and germanium in these complexes was confirmed by X-ray studies.X-ray data show that the Si and Ge atoms in 2 and 3 have TBP environments where the ether oxygen and two halogens are equatorial while the third halogen and the amide oxygen occupy axial positions. The axial O–M and Cl–M (M = Si, Ge) distances are somewhat longer than those in similar compounds of tetracoordinate silicon and germanium.Intramolecular coordination in compounds 1–3 and relative stabilities of different conformations of their molecules were studied by quantum-chemical calculations. 相似文献
59.
Marion A. Bourebrab Delphine T Oben Géraldine G. Durand Peter G. Taylor James I. Bruce Alan R. Bassindale Alan Taylor 《Journal of Sol-Gel Science and Technology》2018,88(2):430-441
The influence of the water content in the initial composition on the size of silica particles produced using the Stöber process is well known. We have shown that there are three morphological regimes defined by compositional boundaries. At low water levels (below stoichiometric ratio of water:tetraethoxysilane), very high surface area and aggregated structures are formed; at high water content (>40?wt%) similar structures are also seen. Between these two boundary conditions, discrete particles are formed whose size are dictated by the water content. Within the compositional regime that enables the classical Stöber silica, the structural evolution shows a more rapid attainment of final particle size than the rate of formation of silica supporting the monomer addition hypothesis. The clearer understanding of the role of the initial composition on the output of this synthesis method will be of considerable use for the establishment of reliable reproducible silica production for future industrial adoption. 相似文献
60.