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HePingZeng 《中国化学快报》2002,13(12):1231-1234
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. 相似文献
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Reduction of a series of N,N'-diaryl adipyl bis-azo compounds using hydrazine hydrate as reductant was investigated. The products were characterized by elemental analysis, IR and 1H NMR methods and confirmed to be N,N'-diaryl adipyl dihydrazine. The results show that hydrazine hydrate can selectively reduce azo bonds with other potential reducible bonds intact in the N,N'-diaryl adipyl bis-azo compounds. The yields are high up to 92% under mild reaction conditions. According to the previous reports, this reduction process was attributed to an indirect reduction mechanism through an intermediate diimide. 相似文献
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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. 相似文献
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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。 相似文献
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由水杨醛与水合肼反应生成希夫碱N ,N′ 双水杨醛缩连氮 ,并用溶液法生长其单晶。X 射线单晶结构分析表明 ,此晶体属于单斜晶系 ,P2 ( 1) /n空间群 ,晶胞参数为 :a =8.4 97( 4 ) ,b =6 .2 90 ( 3) ,c =11.789( 5 ) ,β=10 7.874 ( 7)° ,V =5 99.6 ( 4 ) 3 ,Z =2 ,Dc =1.331g·cm-3 ,F ( 0 0 0 ) =2 5 2 ,结构偏离因子R =0 .0 4 6 9,wR2 =0 .110 8。晶体中一个分子羟基上的氧原子与另一个分子中 -CH =N -上的氢原子之间形成分子间氢键 (O┄H -C)。 相似文献
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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。 相似文献
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Two coordination compounds with a flexible ligand N,N?-diacetic acid imidazolium(HDAM),{[Co(trans-DAM)(bipy)(H2O)2](OH)·4H2O}n 1 and {[Cd(trans-DAM)(bipy)(H2O)](NO3)?2H2O}n 2(bipy = 4,4'-bipyridine),were prepared and characterized by single-crystal X-ray diffraction.Compound 1 crystallizes in monoclinic,space group P2/n with a = 7.589(6),b = 11.444(2),c = 12.894(3),β = 90.99(3)°,V = 1119.8(4)3,Z = 4,C8.5H14N2O5.5Co0.5,Mr = 261.68,Dc = 1.552 g/cm3,F(000) = 546,μ = 0.832 mm-1,the final R = 0.0657 and wR = 0.1958.Compound 2 crystallizes in the monoclinic C2 space group with a = 17.479(4),b = 11.689(2),c = 11.670(2),β = 117.13(3)°,V = 2121.9(7)3,Z = 4,C17H21N5O10Cd,Mr = 567.79,Dc = 1.777 g/cm3,F(000) = 1144,μ = 1.096 mm-1,the final R = 0.0233 and wR = 0.0638.In 1,the Co(II) ions are linked by μ2-trans-DAM-and bipy ligands to build a 2D(4,4) rectangular grid layer,exhibiting a 4-connected sql net.As for 2,μ3-trans-DAM-and bipy bridge Cd(II) ions form a 2D double-layer,consisting of a couple of(4,4) grid layers,which can be viewed as a(3,4)-connected network.In both compounds,the 2D structures are stabilized by hydrogen bonding interactions to give 3D supramolecular frameworks.Additionally,FT-IR spectroscopy,UV-Visible spectroscopy,and the fluorescent properties are discussed. 相似文献
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研究了由N,N,N′,N′-对四甲基苯二胺(TMPD)/电子受体组成的光致电子转移变色体系,及其在溶液中和高分子膜中的光反应和热稳定性。实验结果表明这类光致变色体系具有较高速度的光响应能力。在不同芳胺/碘鎓盐(DPIOC)组成的体系中,可观察到电子转移速度随芳胺的氧化还原电位下降而增加:TMPD>N,N-二甲基苯胺>三苯胺>二苯胺。光反应速度和反应物浓度具有一定指数关系,分别为0.66(TMPD)和0.16(二苯基碘铕盐)。在TMPD/卤代烃(RX)组成的体系中,发现卤代烃的C—X键较弱时,体系的光致生色反应速度较快。显然,这是由于反应中间产物(RX-)的分解有利于减少电子逆转移反应的缘故。在聚甲基丙烯酸甲酯高分子膜中的光致生色反应效率显著地高于溶液中的反应效率,并能获得较高的光密度。热稳定性结果表明,温度对色稳定性有显著影响,每经过一次生色/褪色循环,体系的发色能力下降一半左右。 相似文献
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研究新型萃取剂从硝酸盐介质中萃取分离稀土元素对于后处理工艺具有重要意义。本文报道以甲苯为稀释剂,N,N,N′,N′-四丁基丙二酰胺(TBMA)从硝酸盐介质中萃取铈(Ⅲ)、镝(Ⅲ)、铒(Ⅲ)、镨(Ⅲ)、钐(Ⅲ)、铽(Ⅲ)、铥(Ⅲ)、镱(Ⅲ)的机理。考察了硝酸浓度、TBMA浓度、盐析剂浓度以及温度对上述三价镧系离子分配比的影响。得出萃合物的组成主要是三配体配合物M(NO3)3·3TBMA;计算出萃取反应的条件平衡常数、萃取平衡常数。温度效应研究表明萃取反应主要是焓驱动的。对萃取分离系数以及TBMA萃取三价镧系离子的规律进行了初步研究。 相似文献
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Bao-qing Shentu Ji-peng Li Zhi-xue Weng 《高分子科学》2006,(4):345-351
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. 相似文献