全文获取类型
收费全文 | 119篇 |
免费 | 4篇 |
专业分类
化学 | 103篇 |
晶体学 | 3篇 |
力学 | 1篇 |
数学 | 8篇 |
物理学 | 8篇 |
出版年
2023年 | 1篇 |
2022年 | 1篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 3篇 |
2016年 | 2篇 |
2015年 | 3篇 |
2014年 | 2篇 |
2013年 | 9篇 |
2012年 | 5篇 |
2011年 | 8篇 |
2010年 | 4篇 |
2009年 | 3篇 |
2008年 | 13篇 |
2007年 | 3篇 |
2006年 | 14篇 |
2005年 | 5篇 |
2004年 | 6篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2000年 | 1篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1997年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1992年 | 4篇 |
1991年 | 2篇 |
1990年 | 4篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1979年 | 1篇 |
排序方式: 共有123条查询结果,搜索用时 781 毫秒
71.
Ooyama Y Sumomogi M Nagano T Kushimoto K Komaguchi K Imae I Harima Y 《Organic & biomolecular chemistry》2011,9(5):1314-1316
A new class of fluorescence sensor for detection of water in organic solvents based on photo-induced electron transfer (PET) of anthracene coupled with an amino acid has been designed and developed. 相似文献
72.
Ooyama Y Matsugasako A Oka K Nagano T Sumomogi M Komaguchi K Imae I Harima Y 《Chemical communications (Cambridge, England)》2011,47(15):4448-4450
Anthracene-boronic acid ester as a new class of fluorescence PET sensors for detection of a trace amount of water in organic solvents has been designed and developed. 相似文献
73.
Kajitani Kunihiko 《偏微分方程通讯》2013,38(10):1137-1162
74.
Takayoshi Tsuzuki Natsumi Sakaguchi Takashi Kudoh Satoshi Takano Masato Uehara Takashi Murayama Takashi Sakurai Minako Hashii Haruhiro Higashida Karin Weber Andreas H. Guse Tomoshi Kameda Takatsugu Hirokawa Yasuhiro Kumaki Barry V. L. Potter Hayato Fukuda Mitsuhiro Arisawa Satoshi Shuto 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2013,125(26):6765-6769
75.
Mitsushiro Nomura Noriko SakamotoHirokazu Nakajima Chikako Fujita-TakayamaToru Sugiyama Masatsugu Kajitani 《Polyhedron》2011,30(17):2890-2895
Azido coordinated dithiolene complexes [CpCo(N3){S2C2(CO2Me)2}(S-CHR1R2)], where R1, R2 = H (4a); R1 = H, R2 = SiMe3 (4b); R1 = H, R2 = CO2Et (4c), were synthesized by the reactions of the corresponding Cl− coordinated precursors [CpCo(Cl){S2C2(CO2Me)2}(S-CHR1R2)] (3a-3c) with sodium azide. The Cl− coordinated complex 3d (R1, R2 = CO2Me) did not produce any N3− coordinated complexes but formed the CR1R2-bridged alkylidene adduct [CpCo{S2C2(CO2Me)2}(CR1R2)] (2d; R1, R2 = CO2Me). The structure of 4a was determined by X-ray diffraction study. In the molecular structure of 4a, the coordinated N3− ligand and CHR1R2 group were located at the same side with respect to the dithiolene ring (syn form), although the corresponding Cl− precursor (3a; R1, R2 = H) was anti form. A structural conversion of syn/anti was conceivable during the Cl−/N3− ligand exchange. Thermal (80 °C) and photochemical reactions (Hg lamp) of 4a-4c were performed. Among them, 4c was relatively well reacted compared with the others to form the CR1R2-bridged alkylidene adduct (2c; R1 = H, R2 = CO2Et), followed by a formal HN3 elimination, and the reaction also produced non-adduct of the cobalt dithiolene complex [CpCo{S2C2(CO2Me)2}] (1). The electrochemical 1e− reduction of 4c underwent a formal N3− ligand elimination, and successive second reduction caused the CHR1R2 group elimination or reformed the CR1R2-bridged alkylidene adduct 2c. 相似文献
76.
The precipitation of Na+ and K+ mixed salts of Anderson type [SbW6O24]7− by addition of excess of NaNO3 and NaCl yielded polycrystalline powders of Na2.5K5.3[SbW6O24](NO3)0.8·12H2O (1) and Na2K5.35[SbW6O24]Cl0.35·12H2O (2), respectively. The two compounds are isomorphous and exhibit a layer-like Anderson (LLA) type structure, which consists of [SbW6O24]7−-containing layers and interstitial Na+, K+, NO3− or Cl−, and water O atoms. Recrystallization of 1 and 2 from hot water yielded Na2K5.4[SbW6O24](NO3)0.4·12H2O (1-recry) and Na2K5.25[SbW6O24]Cl0.25·12H2O (2-recry) as a result of partial release of NO3− and Cl− (and Na+ and K+ for charge compensation). Dehydration of 1 and 2 at 400 and 500 °C (1-dehyd400 and 2-dehyd500) caused a shrinkage of lattice, but their the LLA structures retained. Simulation of X-ray diffraction (XRD) patterns for the dehydrated forms allowed to presume that the each [SbW6O24]7− anion had been 30°-rotated within its molecular plane in order to avoid intermolecular repulsion. A compressed powder of 1-dehyd400 exhibited fast alkaline-ion conduction with a bulk conductivity of 1.2×10−2 Ω−1 cm−1 at 400 °C. The hosting of a sufficient amount of NO3− together with Na+ for charge compensation into the lattice is crucial for high conduction. 相似文献
77.
The diffusion coefficients of C(60) in dichloromethane and benzonitrile solutions containing 0.1 M tetrabutylammonium perchlorate were determined by single potential-step chronoamperometry at small disk electrodes. The diffusion coefficients of C(60) were obtained by curve fitting of the chronoamperograms to a theoretical equation by Shoup and Szabo. The values were (1.4 +/- 0.3) x 10(-9) and (4.1 +/- 0.3) x 10(-10) m(2) s(-1), respectively (the errors are 95% confidence limits). The diffusion coefficients of C(60)(-) in these solutions were measured by double potential-step chronoamperometry. The ratios of the diffusion coefficients of C(60) to those of C(60)(-) were obtained from theoretical curves of the ratios of the current at the second potential step to the current at the first one. The values of the ratios were 1.2 +/- 0.2 and 1.0 +/- 0.3, respectively. 相似文献
78.
Masahito Ochiai Minako Inenaga Yoshimitsu Nagao
Robert M. Moriarty
Radhe K Vaid Michael P. Duncan 《Tetrahedron letters》1988,29(52):6917-6920Cyclic amino acids L-proline, pipecolinic acid and L-2-pyrrolidinone-5-carboxylic acid undergo oxidative decarboxylation with iodosobenzene in various solvents (including water) to yield the lactam and imide in the latter case. The reaction proceeds via initial imine formation. 相似文献
79.
Thin films of tetrathiofulvalene-tetracyanoquinodimethane (TTF-TCNQ), a typical organic material of charge transfer salts, were prepared on glass substrates by evaporation using TTF-TCNQ powder. The rubbing effect on the surface morphology and thermoelectric properties was studied. TTF-TCNQ films exhibited a bush-like disordered growth on the as-received glass substrate, whereas those on the rubbed glass substrate had extremely flat surfaces tiled with small rectangular TTF-TCNQ single crystals. Due to the ordered alignment of TTF-TCNQ tiles, improvement in the electrical conductivity and enhancement of the Seebeck coefficient were achieved. 相似文献