酚醛型吸附树脂对水体系中吡啶和N,N-二甲基苯胺的吸附性能研究

研究了酚醛型吸附树脂在水体系中对吡啶和N，N-二甲基苯胺的静态和动态吸附行为．结果表明，在水中树脂对吡啶和N，N-二甲基苯胺的吸附主要以疏水吸附机理进行；吸附吡啶和N．N-二甲基苯胺的初始阶段，即达到38．3～48．9％平衡吸附时，吸附速率数据和半经验速率方程很吻合：酚醛型吸附树脂等温吸附吡啶和N，N-二甲基苯胺的平衡吸附数据符合Langmuir方程，相关系数在0．99以上，酚醛型吸附树脂吸附吡啶和N，N-二甲基苯胺属单分子层吸附：用80％的乙醇溶液作洗脱剂来洗脱吸附吡啶已达饱和的JDW-2树脂，效果是很理想的．在3．6个床体积内洗脱率达91．52％，4．8个床体积内洗脱率达到94．85％。表明酚醛型吸附树脂具有优良的洗脱性能．     

Kinetic-catalytic determination of traces of iron by the oxidative coupling reaction of 3-methyl-2-benzothiazolinone hydrazone with N,N-dimethylaniline

A new kinetic-catalytic method by the initial rate procedure for the determination of nanogram level of iron(III) is developed, which is based on its catalytic effect on the oxidative coupling of 3-methyl-2-benzothiazolinone hydrazone (MBTH) with N,N-dimethylaniline (DMA) to form an indamine dye (λ_max=590 nm) in the presence of hydrogen peroxide. Iron(II) is also determined, being oxidized to iron(III) by hydrogen peroxide. Calibration graphs obtained by the initial rate method are linear in the range 1–1000 ng ml⁻¹ Fe and as low as 10⁻⁸ M Fe(II, III) can easily be determined. The relative standard deviations are 6.6, 2.5 and 1.5% for ten determinations of 1, 20 and 60 ng ml⁻¹ of Fe(III), respectively. The method is applicable to the determination of iron in natural waters without preconcentration and separation.     

聚（N,N—二甲基苯胺）中稳定自由基的性质研究

介绍了聚（Ｎ，Ｎ－二甲基苯胺）阳离子自由基的结构特点，利用顺磁共振波谱和紫外－可见吸收光谱，研究了温度及溶液粘度对聚合物自由基的影响，发现聚（Ｎ，Ｎ－二甲基苯胺）的主，侧链结构构象变化与其自由基的稳定性很大的关系。     

聚(N,N-二甲基苯胺)的质子化研究

研究了聚(N,N-二甲基苯胺)在硫酸和三氯醋酸水溶液中的质子化行为,对其吸收光谱和核磁共振谱的研究发现,聚(N,N-二甲基苯胺)在不同酸度下存在两种质子化状态:在强酸体系中质子加在侧基氮原子上,在中等酸性体系中质子加在主链的苯环上.     

Viscosity and Thermodynamics of Viscous Flow of 1-propanol with Aniline,N-methylaniline and N,N-dimethylaniline

Abstract

Viscosities of the systems, 1-propanol + aniline, 1-propanol+N-methylaniline and 1-propanol+N,N-dimethylaniline have been measured in the temperature range 294.15 to 323.15K for the whole range of composition. The viscosities have been plotted against mole fraction of anilines. The viscosity-composition curves show minima, though not well-defined, in highly rich, moderately rich and moderately poor regions of 1-propanol respectively for 1-propanol + aniline, 1-propanol + N-methylaniline and 1-propanol +N,N-dimethylaniline systems. The excess viscosities have been found to be negative for all the systems throughout the whole composition and plotted against mole fraction of anilines. The thermodynamic activation parameters, such as, enthalpies, entropies and free energies and their excess values have been evaluated. The excess free energies have been found to be negative for all the systems and over the whole range of composition. The excess free energies have been plotted against the mole fraction of anilines. The viscosities, excess viscosities and excess free energies have been explained by assuming that the associated compounds, aniline, N-methylaniline and 1-propanol, are dissociated into smaller units in the solution systems by the rupture of H-bonds.     

Spectrophotometric Determination of Oxygen as Its Charge-Transfer Complex with N,N-Dimethylaniline

Abstract

Oxygen (5–100%) in gas mixtures is determined by measuring the absorbance of its charge-transfer complex with dimethylaniline at 347 nm. The method is essentially specific, and merely requires bubbling the gas through the reagent, stabilized with EDTA. Oxygen is simply removed from the reagent by purging with nitrogen or carbon dioxide.     

共轭聚合物中稳定自由基的ESR研究

通过ＥＳＲ跟踪测试，研究了３种胺类化合物与聚（Ｎ，Ｎ－二甲基苯胺）（ＰＤＭＡ）中离域正离子自由基相线作用的过程，发现胺类化合物能使ＰＤＭＡ的ＥＳＲ谱形发生不同程度的劈裂，信号强度随时间的变化与胺的结构有关，说明正离子自由基与亲核试剂作用后发生了定域化转变，通过进一步比较发现ＰＤＭＡ自由基的亲电活性不如聚苯上的正离子的自由基。     

一种合成共轭高分子——聚（N,N—二甲基苯胺）的新方法

利用一种新的合成方法，首次合成了侧链带有强推生基力的聚苯衍生物－－聚（Ｎ，Ｎ－二甲基苯胺），初步研究了中间产物的形成及这种固相聚合反应的适宜条件，并通过元素分析、红外、ＨＮＭＲ及紫外光谱对聚合产物进行了结构表征。     

新型多齿手性氨基醇的合成和结构表征

以L-苯甘氨酸和N,N-二甲基苯胺为原料,合成了2种新型多齿手性氨基醇S-1,1,2-三苯基-2-[(2-二甲氨基-5-溴-1-苯基)甲氨基]-1-乙醇和S-2-苯基-2-[(2-二甲氨基-5-溴-1-苯基)甲氨基]-1-乙醇;利用红外光谱仪、核磁共振谱仪及质谱仪表征了合成产物的结构.     

The ArNe-N2O van der Waals trimer: a high resolution spectroscopic study of its rotational spectrum,structure and dynamics

A new ternary van der Waals complex of the type rare gas-rare gas'-linear molecule, ArNe-N₂O, was investigated using a pulsed molecular beam cavity Fourier transform microwave spectrometer. The rotational spectra of six isotopomers of the trimer were studied in detail. These include Ar²⁰Ne-¹⁴N¹⁴NO, Ar²²Ne-¹⁴N¹⁴NO, Ar²⁰Ne-15N¹⁴NO, Ar²²Ne-¹⁵N¹⁴N0, Ar²⁰Ne-¹⁴N¹⁵NO and Ar²²Ne-¹⁴N¹⁵NO. Nuclear quadrupole hyperfine structures of the rotational transitions that are due to the one or two ¹⁴N nuclei were resolved and analysed. The resulting spectroscopic constants were used to provide structural and dynamical information about the trimer. Based on the quartic centrifugal distortion constants, a harmonic force field analysis was performed to estimate the frequencies of the van der Waals vibrational modes. A perturbation of the electronic charge distribution at the site of the central ¹⁴N nucleus of N²0 upon complex formation was detected and discussed. Differences of structural parameters of the trimer as compared to those of the respective dimer units are indicative of the presence of significant three-body non-additive contributions to the interaction energy.