Dimethylcarbamoyl transfer from N-acyloxypyridinium salts to pyridine N-oxides in acetonitrile occurs in one stage by the forced concerted S(N)2 mechanism. The rate and equilibrium of the reaction are fairly described by the Bronsted equation. The Marcus equation provides a much higher quality of reactivity predictions.
Extra Coordination of Zn-Tetraphenylporphine with Pyridine, Quinoline, and Acridine N-Oxides
作者:V. P. Andreev、Ya. P. Nizhnik、D. G. Bezruchko、A. K. Morozov
DOI:10.1007/s11176-005-0416-6
日期:2005.8
The log K values of zinc tetraphenylporphine (Zn-TPhP) complexes with pyridine, quinoline, and acridine N -oxides and with their nonoxidized analogs, as well as the positions of absorption maxima of the complexes with respect to Zn-TPhP linearly depend on the \(pK_BH^ + }\) of the ligands in water (methanol, acetonitrile, nitromethane, and acetone) and on Hammett σ constants in the absence of steric
四苯基卟啉锌(Zn-TPhP)与吡啶,喹啉和a啶 N- 氧化物及其非氧化类似物的log K 值 以及该复合物相对于Zn-TPhP的最大吸收位置线性取决于水中的配体(甲醇,乙腈,硝基甲烷和丙酮)的\(pK_ BH ^ +} \)和在没有空间位阻效应的情况下的Hammettσ常数。
Complexing Ability of Heterocyclic N-Oxides Toward Proton Donor Compounds
作者:N. Sh. Lebedeva、Yu. A. Gubarev、E. S. Yurina、S. S. Guseinov、A. I. V’yugin、V. P. Andreev
DOI:10.1134/s1070363219070101
日期:2019.7
interaction of styryl derivatives of pyridine N-oxides with proton donors in various solvents was studied. UV-Vis spectroscopy and thermogravimetric analysis were applied to determine the spectral and thermo-chemical characteristics of the resulting molecular complexes. The dependences of the thermodynamic parameters of the complexes on the N-oxide structure and on the solvating medium were established
X-ray Crystal Structure and Magnetic and Photophysical Properties of Novel Copper(II) <i>N</i>-Oxide Adduct [(4-MPyO)<sub>2</sub>(CuCl<sub>2</sub>)<sub>2</sub>(H<sub>2</sub>O)(C<sub>2</sub>H<sub>5</sub>OH)] (4-MPyO = 4-(4-Methoxystyryl)pyridine <i>N</i>-Oxide)
作者:Yakov P. Nizhnik、Anna Szemik-Hojniak、Irena Deperasińska、Lucjan B. Jerzykiewicz、Maria Korabik、Marek Hojniak、Vladimir P. Andreev
DOI:10.1021/ic701413m
日期:2008.3.1
A new mixed adduct, (4-MPyO)2(CuCl2)2(H2O)(C2H5OH) [where 4-MPyO is the 4-(4-methoxystyryl)pyridineN-oxide], was obtained for the first time. It has been characterized by X-ray studies, IR, electronic absorption, and emission spectra, lifetime measurements, and variable-temperature magnetic susceptibility measurements in the range 80-300 K. The single-crystal X-ray diffraction shows that the geometry
首次获得了新的混合加合物(4-MPyO)2(CuCl2)2(H2O)(C2H5OH)[其中4-MPyO是4-(4-甲氧基苯乙烯基)吡啶N-氧化物]。它的特征在于X射线研究,IR,电子吸收和发射光谱,寿命测量以及80-300 K范围内的可变温度磁化率测量。单晶X射线衍射表明,其周围的几何形状铜(II)离子都可以描述为具有梯形碱的四角锥,在其角上是两个N-氧化物的氧原子和两个氯原子。水或乙醇中的氧原子位于金字塔的顶点。除此之外,加合物的两个分子形成双氢键结合的超二聚体,其中它们通过OH的氢键相互连接... 在氯原子和乙醇分子之间形成的Cl类型(Cl ... O 3.22 A)。铜(II)原子在二聚体单元内反铁磁耦合,并且2 J值(1100 cm(-1))的单重态-三重态间隔大于针对桥接角Cu-O-Cu的Hatfield法则所期望的值等于108.9度和110.2度。通过PM3计算的垂直激发能值,
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作者:G. Schroeder、V. I. Rybachenko、K. Yu. Chotii、V. V. Kovalenko、L. V. Grebenyuk、B. Lenska、K. Eitner
DOI:10.1023/a:1024974323588
日期:——
Dimethylcarbamoyl transfer from N-acyloxypyridinium salts to pyridine N-oxides in acetonitrile occurs in one stage by the forced concerted S(N)2 mechanism. The rate and equilibrium of the reaction are fairly described by the Bronsted equation. The Marcus equation provides a much higher quality of reactivity predictions.
Thermal oxidative destruction of complexes of heterocyclic N-oxides with Zn(II)tetra-phenylporphyrin
作者:N. Sh. Lebedeva、W. Zielenkiewicz、E. Utzig、Y. A. Gubarev、V. P. Andreev、Ya. P. Nizhnik
DOI:10.1007/s10973-007-8444-6
日期:2008.2
applied for investigation of molecular complexes of heterocyclicN-oxide with zinc(II)tetraphenylporphyrin. The kinetic characteristics of the process of the thermal oxidative destruction for individual compounds and their molecular complexes have been calculated. The obtained results indicate that the complex formation of ZnTPhP with heteroaromaticN-oxides leads to an increase of the thermal stability