EFFECT OF N,N,N’,N’-TETRAALKYL TEREPHTHALAMIDE ON NON-ISOTHERMAL CRYSTALLIZATION KINETICS OF POLYPROPYLENE

The effect of N,N,N＇,N＇-tetraalkyl terephthalamide （TATA） on the non-isothermal crystallization and melting characteristics ofpolypropylene （PP） was studied. The addition of TATA can lead to the formation ofβ-crystal PP. With the increase in TATA concentration the degree of crystallinity for β-crystal PP increased significantly, and that for a-crystal PP decreased, which indicated that TATA effectively induced the formation of β-crystal PP. WAXD also revealed the existence of β-crystal PP after the introduction of TATA into PP. PP containing TATA crystallized at a temperature range of 5-10℃ higher than that of pure PP, and the half-crystallization time （t1/2） and Avrami exponent （n） of PP at the same cooling rate were decreased by the addition of TATA, indicating that TATA influenced the crystallization rate and crystallization growth mode of PP. The rate constant of crystallization of PP containing TATA （Zc） was larger than that of pure PP, which further indicated that the crystallization of PP was accelerated by the addition of TATA.     

Evaluation of Transient Absorption Spectra of N,N,N’,N’—Tetra—（p—methylphenyl）

Photoinduced electron transfer processes between fullerenes(C60/C70)and N,N,N’,N’-tetra-(p-methylphenyl-4,4’-diamino-1,1’-diphenyl ether(TPDAE)have been studied by nanosecond laser flash photolysis.Quantum yields and rate constants of electron trasfer from TPDAE to excited triplet state of fullerenes(C60/C70)in benzonitrile have been evaluated by observing the trasient absorption bands in the near-IR region where the excited triplet state.radical anion of fullerenes(C60/C70)and radical cations of TPDAE appear.     

Coordination ability of N,N’-disubstituted 9,10-phenanthrenediimines

The ability of N,N’-disubstituted 9,10-phenanthrenediimines in neutral, monoand direduced states to act as bidentate ligands in main-group-metal and transition-metal complexes has been demonstrated for the first time. The formation of metal complexes with the radical anion form of phenanthrenediimines stabilized through the formation of contact pairs (for Li) or chelate complexes (for Rh) has been detected.     

N,N,N＇,N’-四丁基丁二酰胺萃取Tb（Ⅲ）的研究

国内外在四取代双酰胺类萃取剂萃取铀（Ⅳ）、钍（Ⅳ）的性能研究方面已经做了大量工作，但对核废料中共存稀土元素的萃取研究较少。本文合成了N，N，N’，N’-四丁基丁二酰胺（TBSA），详细研究了其萃取Tb（Ⅲ）的性能。     

N,N,N‘,N’—四己基丙二酰胺从硝酸介质中萃取铀（Ⅵ）

以甲苯为稀释剂研究了N，N，N'，N'－四己基两二酰胺从硝酸介质中萃取硝酸和铀（Ⅵ）的性能．考察了水相硝酸浓度、李取剂浓度、硝酸钠浓度以及温度对萃取分配比的影响，确定了萃合物的组成．借助红外光谱分析了萃合物的结构．求得了萃取硝酸和硝酸铀酰的平衡常数及反应的热力学焓变．与N，N，N'，N'－四丁基丙二酰胺萃取铀的性能比较，发现烷基链长的增加减少了三相生成的倾向，但酰胺的萃取能力却下降．     

N,N,N‘,N’—四异丁基—3—氧—戊二酰胺萃取铀钍的研究

放射性废液中含有大量的钢系和铜系元素,众多学者作了大量研究工作。如焦荣洲等［’］用三烷基氧磷（ＴＲＰＯ）、赵沪根等［’］用ＤＨＤＥＣＭＰ从放射性废液中分离啊系和湖系元素进行了系统研究。但所用革取剂均为含磷化合物,使用后被放射性污染的革取剂最终处置困难。为此面临寻求革取效率高、价廉,又便于最终处置的新型革取剂的任务。文章ｐｌ合成了二酚胺类化合物（Ｒ‘ＲＺＮＣＯ）。Ｒ３系列车取剂,它能有效地从放射性废液中革取分离回收钢系与调系元素。本文探讨了其中的Ｎ,Ｎ,Ｍ,ＮＷ四异了基一３一氧一戊二酚胺（简写为Ｌ…     

Synthesis and Crystal Structure of Potassium triaqua（ethyleneamin—N,N,N‘,N’—tetraacetate）gadolinium（Ⅲ）pentahydrate

1 INTRODUCTION The chemistry of lanthanide (Ⅲ) complexes has a considerable history. The stereochemistry of the lanthanide (Ⅲ) complexes with ethyleneamine- N, N, N, N-tetraacetate (Edta) has been investigated[1~10]. Up to now, many Ln-Edta complexes with the chemical formulae of M[Ln(Edta)(H2O)m]nH2O (M = Na+, K+, Cs+, NH4+, Guanium; m = 2, 3; n = 0, 1, 3, 5) have been reported and suggested that the coordination modes and crystal systems for the Ln-Edta complexes depend on …     

Cyclopalladation of N,N,N′,N′-tetramethylisophthalthioamide

Summary N,N,N,N-Tetramethylisophthalthioamide (Hmpt) was cyclopalladated with PdCl₂ in hot dimethylsulphoxide to give [PdCl(mpt)]. The structure was determined by X-ray analysis. The thioamide is metallated at C(2) to act as an S528-01C528-02S tridentate anionic ligand. There is appreciable steric repulsion between the benzene ring H(4, 6) and the dimethylamino groups. The hydrogens and the methyl groups mutually deviate from the coordination plane in opposite directions. The stability of the fused 5,5-membered chelate ring formed by the S528-03C528-04S ligand seems to overcome the steric hindrance. Derivatives were prepared by replacement of the chloride ion with iodide, diethyldithiocarbamate, 4-tert-butylpyridine, or tri-n-butylphosphine, and characterized spectroscopically. The S528-05C528-06S-fused chelate ring was maintained in these derivatives.     

对二嗪N,N’-二氧化物光还原的电子自旋共振研究

报道了利用原位电子自旋共振(ESR)技术研究对二嗪N,N′-二氧化物光解的结果。研究结果表明,化合物5,6,7和8通过光还原过程从溶剂分子夺取氢原子分别生成稳定的自由基,记录出它们分辨良好的ESR谱。文中还讨论了对二嗪N,N′-二氧化物的光化学反应的自由基机理。     

Vibrational spectra of N,N-dimethyl/diethylaniline,N,N,N′,N′-tetramethyl/tetraethyl-p-phenylenediamine and N,N,N′,N′-tetramethyl/tetraethylbenzidine derivatives

The ground state and protonated state (quaternized salt) vibrational spectra (200–1800 cm⁻¹) of the title amines are reported for various ring and/or methyl deuterated derivatives. Complete assignments are proposed and compared to those established for the parent hydrocarbons, benzene and biphenyl, and for the parent primary amines, aniline, p-phenylenediamine and benzidine. The electronic distribution, N(n)→ring(π) charge-transfer character and inductive effects are characterized from a vibrational point of view. Finally changes in the vibrational and electronic conformation upon protonation of the nitrogen atom are discussed. These results provide a fundamental basis for the vibrational investigation of excited states and reactive transients of aromatic amines.     

N’,N’-二乙基硫脲添加剂对铜微沉积工艺电化学行为的影响

为了研究N’,N’-二乙基硫脲添加剂在微沉积工艺中对铜金属孔洞填充能力的影响, 采用线性伏安法(LSV)、循环伏安法(CV)、SEM测量法分析比较了无添加剂、含硫脲和含N’,N’-二乙基硫脲添加剂时微沉积铜工艺中的电化学行为, 并借助塔菲尔方程, 分析比较此三种情况下电镀反应过程中的电极动力学参数. 结果显示: 当铜微沉积工艺中加入N’,N’ -二乙基硫脲添加剂时, 产生活性极化, 该活性极化效应降低铜离子的放电速度, 抑制孔洞边缘部分沉积较快区域的过快生长; 同时活性极化提高, 将导致成核点的增加, 沉积膜的晶粒较小, 镀膜也较平滑细致, 实验测得铜离子的平滑能力比没有添加剂时提高约50%. 最后通过微沉积工艺成功地将金属铜填充入宽为10 μm, 深宽比为4∶1的微型凹槽中, 且镀层内没有空洞、空隙以及细缝等缺陷.     

Efficient and solvent-free synthesis of 1-amidoalkyl-2-naphthols using <Emphasis Type="Italic">N,N,N’,N’</Emphasis>-tetrabromobenzene-1,3-disulfonamide

N,N,N,’N’-Tetrabromobenzene-1,3-disulfonamide [TBBDA] is found to be a reusable catalyst for efficient synthesis of various amidoalkyl naphthols from β-naphthol, aromatic aldehydes and urea in good to high yields under solvent-free conditions.      

Dinuclear copper(ii) complex with novel N,N’,N”,O-tetradentate Schiff base ligand containing trifluoromethylpyrazole and hydrazone moieties

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Deep eutectic solvent promoted highly efficient synthesis of N,N’-diarylamidines and formamides

A deep eutectic solvent was used as a dual catalyst and reaction medium for the efficient N-formylation of aromatic amines without hazardous organic solvent and catalyst. Treatment of aromatic amines with trimethyl orthoformate and formic acid in deep eutectic solvent at 70 °C gives the corresponding N-formyl derivatives in good to excellent yields. This simple ammonium deep eutectic solvent, easily synthesized from choline chloride and SnCl₂, with 100% atom economy and making it applicable to industry and laboratory. Furthermore, heating the trimethyl orthoformate and aromatic primary amines in the deep eutectic solvent results in formation of the corresponding N,N’-diarylamidines in high yields.