Binuclear metallochelates of 2-(N-tosylamino)benzal-2’-(hydroxymethyl)aniline: Syntheses,structures, and magnetic properties

Binuclear complexes of Co(II), Сu(II), and Pd(II) with 2-(N-tosylamino)benzal-2’-(hydroxymethyl)aniline are synthesized. The compositions and structures of the ligand and complexes are determined from the data of elemental analysis, IR spectroscopy, ¹Н, ¹³С, and ¹⁵N NMR spectroscopy, X-ray absorption spectroscopy, and magnetochemical measurements in a temperature range of 294–77.4 K. All complexes are dimeric. The Cu…Cu and Cо…Cо distances equal to 3.03 and 2.99 Å, respectively, are obtained for the Cu(II) and Co(II) complexes. These complexes are characterized by the antiferromagnetic exchange interaction with 2J = –630 and –42 cm^–1, respectively.     

2-(2-pyridyl)-3-thioindan-1-one: Synthesis,tautomerism, and complexing properties

Chelate and molecular complexes of 2-(2-pyridyl)-3-thioindan-1-one were prepared. The structure of the ligand (prevalent tautomeric form), including the coordination mode, was proved by ¹H NMR, IR, and EXAFS spectroscopy and by quantum-chemical calculations. The soft-hard properties of the ligand were demonstrated.     

高效液相苯胺甲基键合硅胶固定相的保留机理研究

 制备了 3种不同键合量的苯胺甲基键合硅胶固定相 ,分别在正、反相条件下研究了它们对芳烃及其极性、酸性、碱性取代衍生物的保留和分离选择性 ,探讨了该固定相的保留机理 ,并考察温度对溶质在具有不同键合量的固定相上保留的影响。结果表明 :苯胺甲基键合硅胶固定相对溶质的保留是疏水、π π、偶极 偶极和电荷转移等多种作用的结果 ,在反相模式中 ,疏水作用对溶质的保留起主要作用。     

溶胶-凝胶技术制备毛细管硅胶整体柱及其应用

采用溶胶-凝胶技术合成硅胶整体柱，研究了不同反应物配比对制备毛细管硅胶整体柱的影响，合成了具有高机械强度和化学稳定性的毛细管硅胶整体柱。通过十八烷基修饰得到反相固定相。考察了电渗流行为和电色谱性能。3种芳香胺和4种苯同系物可达到基线分离，柱效高达159000N／m。     

Quantum-chemical interpretation of regioselective coordination in the series of 2-aminoazole—metal complexes

Relative thermodynamic stabilities and competitive bonding (regioselective coordination) of Pearson acids MCl₂ (hard BeCl₂, intermediate ZnCl₂, and soft HgCl₂) with aminohetero-cycles L (2-aminooxazole, 2-aminothiazole, and 2-aminoimidazole) have been calculated by the quantum-chemical MNDO method. It follows from the results of the calculation that in tetrahedral MCl₂·2L complexes the coordination bond is formed by the endocyclic pyridine-type nitrogen atom independent of the type of ligands.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2378–2380, December, 1995.This work was financially supported by the Russian Foundation for Basic Research (Project Nos. 94-03-09731 and 93-03-18692).     

The hydrogen bond in heterocyclic aminomethylphenols and hydroxyderivatives of aromatic sulfides

The dipole moments of N-(2-hydroxy-5-alkylbenzyl)-piperidines, NN-bis-(2-hydroxy-5-tert-amylbenzyl)-piperazine, -hydroxyethyl aryl sulfides, and arylmercaptoacetic acids have been determined experimentally, and also calculated by the vector method. On the basis of the results obtained, and on the IR spectra, it is shown that intramolecular hydrogen bonds exist in the above compounds, with the exception of the arylmercaptoacetic acids.     

Synthesis and crystal structure of the molecules of 1-(2-benzothiazolyl)-3,5-dimethylpyrazole C12H11N3S and dioxodichloro[1-(2-benzothiazolyl)-3,5-dimethylpyrazole]molybdenum(VI) [MoO2(C12H11N3S)Cl2]

N. S. Kurnakov Institute of General and Inorganic Chemistry, Academy of Sciences of the USSR. Scientific-Research Institute of, Physical and Organic Chemistry, Rostov State University. Voroshilovgrad Mechanical Engineering Institute. Translated from Zhurnal Strukturnoi Khimii, Vol. 31, No. 5, pp. 45–53, September–October, 1990.     

雌舞毒蛾引诱剂: (＋)-(7R,8S)-7,8-环氧-2-甲基十八烷的不对称全合成

由雌舞毒蛾释放的性引诱剂由于在害虫防治方面的需求不断增加, 已有许多文献对其合成方法进行报道. 以正十一醛和环戊酮为起始原料, 用L-脯氨酸催化的不对称羟醛缩合反应构筑手性中心, 后经拜耶-维利格氧化, 维梯希烯化等步骤, 为雌舞毒蛾性引诱剂(＋)-(7R,8S)-7,8-环氧-2-甲基十八烷提供了一条简便高效的不对称合成新途径, 总收率为37.8%.     

模拟保留指数法分析汽油族组成

传统上用气相色谱正构烃类为基准的Kovats保留指数或线性保留指数对汽油的组份进行定性，分析汽油族组成．但此方法有一定的局限性，一是不适合多阶程序升温过程的分析，其次是对于烯烃含量较多的汽油用软件自动识别分析时，需人工干预，色谱峰总的识别率经常低于90.0％．提出了模拟指数的概念和计算规则．采用模拟保留指数定性，色谱峰识别准确，色谱峰总的识别率一般能达99．5％以上．