全文获取类型
收费全文 | 502篇 |
免费 | 48篇 |
国内免费 | 2篇 |
专业分类
化学 | 337篇 |
晶体学 | 2篇 |
力学 | 18篇 |
数学 | 39篇 |
物理学 | 156篇 |
出版年
2024年 | 6篇 |
2023年 | 8篇 |
2022年 | 18篇 |
2021年 | 28篇 |
2020年 | 22篇 |
2019年 | 19篇 |
2018年 | 27篇 |
2017年 | 21篇 |
2016年 | 23篇 |
2015年 | 25篇 |
2014年 | 26篇 |
2013年 | 39篇 |
2012年 | 46篇 |
2011年 | 45篇 |
2010年 | 22篇 |
2009年 | 19篇 |
2008年 | 25篇 |
2007年 | 11篇 |
2006年 | 15篇 |
2005年 | 9篇 |
2004年 | 10篇 |
2003年 | 9篇 |
2002年 | 6篇 |
2001年 | 5篇 |
2000年 | 5篇 |
1999年 | 4篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1991年 | 2篇 |
1990年 | 2篇 |
1988年 | 1篇 |
1986年 | 2篇 |
1985年 | 7篇 |
1984年 | 6篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 4篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1976年 | 1篇 |
1975年 | 2篇 |
1971年 | 1篇 |
1969年 | 2篇 |
1968年 | 1篇 |
1938年 | 1篇 |
排序方式: 共有552条查询结果,搜索用时 0 毫秒
551.
Dr. Andreas Hermann Rana Seymen Dr. Lukas Brieger Johannes Kleinheider Dr. Bastian Grabe Prof. Dr. Wolf Hiller Prof. Dr. Carsten Strohmann 《Angewandte Chemie (International ed. in English)》2023,62(25):e202302489
Since its introduction in 2004, Knochel's so called Turbo-Grignard reagents revolutionized the usage of Grignard reagents. Through the simple addition of LiCl to a magnesium alkyl an outstanding increase in reactivity can be achieved. Though the exact composition of the reactive species remained mysterious, the reactive mixture itself is readily used not only in synthesis but also found its way into more distant fields like material science. To unravel this mystery, we combined single-crystal X-ray diffraction with in-solution NMR-spectroscopy and closed our investigations with quantum chemical calculations. Using such a variety of methods, we have gained insight into and an explanation for the extraordinary reactivity of this extremely convenient reagent by determining the structure of the first bimetallic reactive species [t-Bu2Mg ⋅ LiCl ⋅ 4 thf] with two tert-butyl anions at the magnesium center and incorporated lithium chloride. 相似文献
552.
Dr. Supriya Ghosh Dr. Debkumar Rana Dr. Bapi Pradhan Dr. Patrice Donfack Prof. Dr. Johan Hofkens Prof. Dr. Dr. Arnulf Materny 《Chemphyschem》2023,24(21):e202300303
In recent years, there has been an impressively fast technological progress in the development of highly efficient lead halide perovskite solar cells. Nonetheless, the stability of perovskite films and associated solar cells remains a source of uncertainty and necessitates sophisticated characterization techniques. Here, we report low- to mid-frequency resonant Raman spectra of formamidinium-based lead mixed-halide perovskites. The assignment of the different Raman lines in the measured spectra is assisted by DFT simulations of the Raman spectra of suitable periodic model systems. An important result of this work is that both experiment and theory point to an increase of the stability of the perovskite structure with increasing chloride doping concentration. In the Raman spectra, this is reflected by the appearance of new lines due to the formation of hydrogen bonds. Thus, higher chloride doping results in less torsional motion and lower asymmetric bending contributing to higher stability. This study yields a solid basis for the interpretation of the Raman spectra of formamidinium-based mixed-halide perovskites, furthering the understanding of the properties of these materials, which is essential for their full exploitation in solar cells. 相似文献