全文获取类型
收费全文 | 1777篇 |
免费 | 75篇 |
国内免费 | 7篇 |
专业分类
化学 | 1539篇 |
晶体学 | 14篇 |
力学 | 29篇 |
数学 | 55篇 |
物理学 | 222篇 |
出版年
2023年 | 16篇 |
2022年 | 11篇 |
2021年 | 21篇 |
2020年 | 34篇 |
2019年 | 24篇 |
2018年 | 17篇 |
2017年 | 16篇 |
2016年 | 34篇 |
2015年 | 35篇 |
2014年 | 39篇 |
2013年 | 63篇 |
2012年 | 70篇 |
2011年 | 101篇 |
2010年 | 54篇 |
2009年 | 61篇 |
2008年 | 114篇 |
2007年 | 97篇 |
2006年 | 114篇 |
2005年 | 106篇 |
2004年 | 100篇 |
2003年 | 75篇 |
2002年 | 107篇 |
2001年 | 52篇 |
2000年 | 41篇 |
1999年 | 30篇 |
1998年 | 13篇 |
1997年 | 16篇 |
1996年 | 20篇 |
1995年 | 10篇 |
1994年 | 17篇 |
1993年 | 17篇 |
1992年 | 23篇 |
1991年 | 15篇 |
1990年 | 18篇 |
1989年 | 19篇 |
1988年 | 17篇 |
1987年 | 14篇 |
1986年 | 11篇 |
1985年 | 25篇 |
1984年 | 21篇 |
1982年 | 16篇 |
1981年 | 14篇 |
1980年 | 8篇 |
1979年 | 17篇 |
1978年 | 8篇 |
1977年 | 12篇 |
1976年 | 19篇 |
1974年 | 16篇 |
1973年 | 16篇 |
1967年 | 8篇 |
排序方式: 共有1859条查询结果,搜索用时 15 毫秒
121.
Functional porous coordination polymers 总被引:18,自引:0,他引:18
The chemistry of the coordination polymers has in recent years advanced extensively, affording various architectures, which are constructed from a variety of molecular building blocks with different interactions between them. The next challenge is the chemical and physical functionalization of these architectures, through the porous properties of the frameworks. This review concentrates on three aspects of coordination polymers: 1). the use of crystal engineering to construct porous frameworks from connectors and linkers ("nanospace engineering"), 2). characterizing and cataloging the porous properties by functions for storage, exchange, separation, etc., and 3). the next generation of porous functions based on dynamic crystal transformations caused by guest molecules or physical stimuli. Our aim is to present the state of the art chemistry and physics of and in the micropores of porous coordination polymers. 相似文献
122.
Shusuke Yamanaka Keita Kanda Toru Saito Yasutaka Kitagawa Takashi Kawakami Masahiro Ehara Mitsutaka Okumura Haruki Nakamura Kizashi Yamaguchi 《Chemical physics letters》2012
We assessed the applicability and basis set dependency of the B3LYP functional to investigate magnetic interactions of Mn complexes. For the purpose, we constructed a test set consisting of 16 Mn complexes with various oxidation states and structural motifs.The B3LYP results correctly reproduced magnetism and magneto–redox correlation of the standard μ-oxo motifs with superexchange paths, while it does not work for weak magnetic complexes. We also showed that a modest basis set yields results similar to those of triple-zeta plus diffuse-and-polarization functions. This basis set is expected to be a standard basis set for investigating magnetism of manganese complexes. 相似文献
123.
124.
125.
Inside Cover: Enhancement of Light Absorption Ability of Synthetic Chlorophyll Derivatives by Conjugation with a Difluoroboron Diketonate Group (Chem. Eur. J. 29/2016)
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)
126.
127.
Utilization of a metalloligand, ([Cu(2,4-pydca)2(H2O)].2Et3NH) (1) (2,4-pydca = pyridine-2,4-dicarboxylate), as a building unit provides a novel porous coordination polymer, ([ZnCu(2,4-pydca)2(H2O)3(DMF)].DMF)n (2), in which the Zn(II) ion at the node of the network acts as a linker and the Cu(II) ion in the channel wall is available for guest-coordination. 相似文献
128.
129.
130.
[reaction: see text] Radical cascade reaction with various 1,4-dienes and 1,4-enynes using dimethyl 2-(iodomethyl)cyclopropane-1,1-dicarboxylate as a homoallyl radical precursor smoothly proceeds through an iodine atom transfer mechanism to give functionalized bicyclo[3.3.0]octane derivatives in good yields. 相似文献