全文获取类型
收费全文 | 153篇 |
免费 | 10篇 |
国内免费 | 3篇 |
专业分类
化学 | 126篇 |
晶体学 | 1篇 |
力学 | 2篇 |
数学 | 3篇 |
物理学 | 34篇 |
出版年
2024年 | 1篇 |
2023年 | 6篇 |
2022年 | 9篇 |
2021年 | 4篇 |
2020年 | 1篇 |
2019年 | 8篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 3篇 |
2015年 | 5篇 |
2014年 | 10篇 |
2013年 | 12篇 |
2012年 | 7篇 |
2011年 | 16篇 |
2010年 | 7篇 |
2009年 | 3篇 |
2008年 | 13篇 |
2007年 | 8篇 |
2006年 | 7篇 |
2005年 | 10篇 |
2004年 | 12篇 |
2003年 | 3篇 |
2002年 | 4篇 |
2001年 | 3篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有166条查询结果,搜索用时 15 毫秒
101.
Ryusei Oketani Francesco Marin Dr. Paul Tinnemans Marine Hoquante Anne Laurent Dr. Clément Brandel Prof. Dr. Pascal Cardinael Dr. Hugo Meekes Prof. Dr. Elias Vlieg Prof. Dr. Yves Geerts Prof. Dr. Gérard Coquerel 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(61):13890-13898
A productive deracemization process based on a quaternary phase diagram study of a naphthamide derivative is reported. New racemic compounds of an atropisomeric naphthamide derivative have been discovered, and a quaternary phase diagram has been constructed that indicated that four solids are stable in a methanol/H2O solution. Based on the results of a heterogeneous equilibria study showing the stable domain of the conglomerate, a second-order asymmetric transformation was achieved with up to 97 % ee. Furthermore, this methodology showcases the chiral separation of a stable racemic compound forming system and does not suffer from any of the typical limitations of deracemization, although application is still limited to conglomerate-forming systems. We anticipate that this present study will serve as a fundamental model for the design of sophisticated chiral separation processes. 相似文献
102.
103.
104.
Boulay A Artigau M Coulais Y Picard C Mestre-Voegtlé B Benoist E 《Dalton transactions (Cambridge, England : 2003)》2011,40(23):6206-6209
In this communication, a novel synthetic pathway has been applied to prepare a dual imaging agent in a single molecule. The dinuclear Re(I)/Tc(I) complex 6, namely [Re(CO)(3)(bipy){(4-PyrIDA)Tc(CO)(3)}], is the first example of a Re/Tc-based heterometallic assembly which could act as a potential bimodal Optical/SPECT probe. Interestingly, the Re(I) complex intermediate 4 exhibits significant photophysical properties for biological applications. 相似文献
105.
Coupling amperometry and total internal reflection fluorescence microscopy at ITO surfaces for monitoring exocytosis of single vesicles 总被引:1,自引:0,他引:1
106.
Small Iminocoumarin Derivatives as Red Emitters: From Biological Imaging to Highly Photoluminescent Non‐doped Micro‐ and Nanofibres
下载免费PDF全文
![点击此处可从《Chemistry (Weinheim an der Bergstrasse, Germany)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Kacem Khemakhem Marine Soulié Dr. Rémy Brousses Dr. Houcine Ammar Prof. Souhir Abid Dr. Suzanne Fery‐Forgues 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(21):7927-7937
The fluorescence properties of four derivatives of 3‐thienyl‐2‐(N‐dicyanovinyl)iminocoumarin, bearing a diethylamino group in the 7‐position or a methoxy group in the 6, 7 and 8 positions, were compared in solution and in the solid state. The 7‐diethylamino derivative was strongly fluorescent in various solvents, with marked solvatochromism. Its fluorescence was quenched by aggregation. In contrast, the methoxy derivatives were only moderately or weakly fluorescent in solution, but two of them were strongly photoluminescent in the crystalline state, owing to favourable molecular packing. The 6‐methoxy derivative even exhibited spectacular crystallization‐enhanced emission, examples of which are particularly rare for this type of dyes. Dyes were tested for biological use. The 7‐diethylamino derivative led to particularly strong fluorescence staining of the cytoplasm of HCT‐116 colon cancer cells. No fading was observed over prolonged illumination by the microscope light beam, but a phototoxic effect was detected. The use of the dyes as red‐emitting materials was also investigated. Using easy‐to‐implement preparation methods, the compounds self‐ assembled to give one‐dimensional nano‐ and microsized particles, including millimeter‐long microfibres that exhibited clear wave‐guiding properties. This study shows the value of these low molecular‐weight molecules for the preparation of new orange and red‐emitting fluorescent materials based on totally pure dye. 相似文献
107.
Laurens M. De Coen Bart I. Roman Marine Movsisyan Brecht Dhont Nils De Vos Kristof Van Hecke Christian V. Stevens 《Tetrahedron letters》2017,58(37):3612-3615
A new class of dicationic ionic salts has been developed based on two 7-azoniabicyclo[2.2.1]heptane moieties and a variable spacer. The construction of the 7-azabicyclo[2.2.1]heptane skeleton and introduction of the two- to ten-atom spacer occurred concurrently in a one-pot reaction. Quaternization and subsequent metathesis afforded the dicationic salts consisting of two linked quaternized bicyclic moieties and bis(trifluoromethylsulfonyl)imide or dicyanamide as counterions. These salts are liquids at room temperature if the spacer length was larger than seven atoms. X-ray diffraction analysis revealed a linear conformation of the spacer and RS/SR stereochemistry of the quaternized nitrogens. 相似文献
108.
109.
110.
Polymeric polyimide capillary tubing, both uncoated and coated with stationary phases of two polarities, is explored for use as capillary columns for gas chromatography (GC). These glass-free polyimide columns are flexible and their small winding diameter of less than a cm around a solid support makes them compatible for potential use in portable GC instruments. Polyimide columns with dimensions of 0.32 mm i.d. × 3 m are cleaned, annealed at 300°C, and coated using the static method with phenylmethylsilicone (PMS). Separations of volatile organics are investigated isothermally on duplicate sets of polyimide columns by GC with a flame ionization detector using split injection. Unlike the uncoated ones, the coated polyimide columns successfully separate Grob test mix classes of alkanes, amines, and fatty acid methyl esters. The relative standard deviations for retention time and peak area are 0.5 and 2.5 , respectively. With the 3 m PMS-coated column connected to a retention gap to permit operation at its optimum flow rate of 30 cm/s, a plate count of 3200 or plate height of 1 mm is possible. Lack of retention and tailing peaks are evident for the polyimide polymer capillary columns as compared to that of a 3 m commercial cross-linked PMS fused silica capillary. However, headspace analyses of an aromatic hydrocarbon mix and a Clearcoat automotive paint sample are viable applications on the PMS polyimide polymer column. 相似文献