全文获取类型
收费全文 | 76篇 |
免费 | 1篇 |
专业分类
化学 | 74篇 |
物理学 | 3篇 |
出版年
2022年 | 4篇 |
2021年 | 2篇 |
2020年 | 1篇 |
2019年 | 1篇 |
2018年 | 6篇 |
2017年 | 4篇 |
2016年 | 3篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 4篇 |
2012年 | 5篇 |
2011年 | 4篇 |
2010年 | 4篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2007年 | 2篇 |
2003年 | 3篇 |
2002年 | 2篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 1篇 |
1995年 | 1篇 |
1992年 | 1篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1976年 | 1篇 |
排序方式: 共有77条查询结果,搜索用时 15 毫秒
21.
Ivan V. Smolyaninov Andrey I. Poddelsky Daria A. Burmistrova Yulia K. Voronina Nadezhda P. Pomortseva Vasiliy A. Fokin Ekaterina D. Tselukovskaya Ivan V. Ananyev Nadezhda T. Berberova Igor L. Eremenko 《Molecules (Basel, Switzerland)》2022,27(23)
A number of novel heteroligand Zn(II) complexes (1–8) of the general type (Ln)Zn(NN) containing O,N,O′-, O,N,S-donor redox-active Schiff bases and neutral N,N′-chelating ligands (NN) were synthesized. The target Schiff bases LnH2 were obtained as a result of the condensation of 3,5-di-tert-butyl-2-hydroxybenzaldehyde with substituted o-aminophenols or o-aminothiophenol. These ligands with combination with 2,2′-bipyridine, 1,10-phenanthroline, and neocuproine are able to form stable complexes upon coordination with zinc(II) ion. The molecular structures of complexes 4∙H2O, 6, and 8 in crystal state were determined by means of single-crystal X-ray analysis. In the prepared complexes, the redox-active Schiff bases are in the form of doubly deprotonated dianions and act as chelating tridentate ligands. Complexes 6 and 8 possess a strongly distorted pentacoordinate geometry while 4∙H2O is hexacoordinate and contains water molecule coordinated to the central zinc atom. The electrochemical properties of zinc(II) complexes were studied by the cyclic voltammetry. For the studied complexes, O,N,O′- or O,N,S-donor Schiff base ligands are predominantly involved in electrochemical transformations in the anodic region, while the N,N′-coordinated neutral nitrogen donor ligands demonstrate the electrochemical activity in the cathode potential range. A feature of complexes 5 and 8 with sterically hindered tert-butyl groups is the possibility of the formation of relatively stable monocation and monoanion forms under electrochemical conditions. The values of the energy gap between the boundary redox orbitals were determined by electrochemical and spectral methods. The parameters obtained in the first case vary from 1.97 to 2.42 eV, while the optical bang gap reaches 2.87 eV. 相似文献
22.
23.
Milaeva E. R. Shpakovsky D. B. Gracheva Yu. A. Berberova N. T. Egorov M. P. 《Russian Chemical Bulletin》2001,50(6):1097-1100
2,6-Di-tert-butylphenols containing the Pt—SnCl3 and Pt—GeCl3 groups in the para position exert a dual effect on the oxidation of methyl oleate by molecular oxygen. Initially, these compounds act as antioxidants producing the corresponding phenoxyl radicals whose decomposition is accompanied by elimination of SnCl2 and GeCl2, which are oxidation promoters. 相似文献
24.
25.
26.
27.
N. T. Berberova E. V. Shinkar’ I. V. Smolyaninov K. P. Pashchenko 《Doklady Chemistry》2015,465(2):295-298
An indirect electrochemical method for thiolation of cycloalkanes C5–C7 has been suggested. The method is based on a new approach to activation of hydrogen sulfide by redox mediators. 相似文献
28.
29.
Berberova N. T. Klimenko S. K. Shinkar' E. V. Akimova O. N. Sharafutdinov D. R. Pashchenko K. P. 《Russian Journal of Electrochemistry》2003,39(12):1287-1293
The mechanism governing the formation of 2,4-diphenyl-6H-cyclopenta[b]thiopyran and corresponding thiopyrilium perchlorate from 1,3-diphenyl-3-(2-oxocyclopentyl)-1-propanon in conditions of oxidative activation of hydrogen sulfide is considered. The process of oxidation of 2,4-diphenyl-6H-cyclopenta[b]thiopyran in a nonaqueous environment is shown to proceed stepwise through the intermediate formation of a radical cation, radical, and anhydrobase, to aromatic system 2,4-diphenylcyclopentadieno[b]thiopyranilidene. A similar product is obtained when oxidizing the 2,4-diphenylcyclopenta[b]thiopyrilium cation. Reduction of thiopyrilium perchlorate was observed to lead to the formation of a 2,4-diphenylcyclopenta[b]thiopyranyl radical, which is confirmed by an ESR method. The mechanism of redox conversions of thiopyran and thiopyrilium salt is substantiated by a quantum-chemical calculation. 相似文献
30.
Kolyada M. N. Pimenov Yu. T. Berberova N. T. Milaeva E. R. Kharitonashvili E. V. Petrosyan V. S. 《Russian Chemical Bulletin》2001,50(8):1485-1488
The effect of MeSnCl3, which is a highly toxic compound, on the activity of L-lactate:NAD oxidoreductase (lactate dehydrogenase) in the extract from the liver of Russian sturgeon (Asipenser gueldenstaedtiB.). Noncompetitive inhibition of the enzymatic reaction was discovered. This can be due to a change in the enzyme conformation caused by the action on the thiol groups, important for enzyme activity. 相似文献