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electron donating
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  供电子
     For Pcs with electron donating substituents, substitution atβposition results in largerФF than atαposition.
     对于供电子取代基,取代基在β位的酞菁化合物的ФF大于取代基在α位的酞菁的ФF。
短句来源
     The results show that(1) the electron donating substituents caused slightly red shift with the maximum absorption wavelength( λ max ) and emission wavelength( λ em ),and declined the molar absorption coefficient;
     研究结果表明 :随着取代基的供电子能力增加 ,酞菁的最大吸收波长 (λmax)和发射波长 (λem)发生红移 ,摩尔消光系数变小 ;
短句来源
     As the X group became more electron donating from H to 3-methyl, 3-hydroxy or 3-amino, the Re(II/I) oxidation potentials declined, the MLCT absorption maximum of the complex was changed little, the emission maximum blue-shifted, and the emission intensity and the fluorescence lifetime were decreased.
     结果表明 ,随着吡啶环上取代基供电子能力的增强 ,H
短句来源
     The duplex bonds of carbon in KH570 are weakened due to the formation of П44 delocalization bonds between the duplex bonds and carbonyl groups, whereas the duplex bonds of carbon in KH858 are strengthened due to the electron donating effects of silicon atoms.
     由于KH570中含有的双键与羰基形成了离域П44键,使其双键结合力减弱; 而在KH858中由于硅原子的供电子效应,使其双键结合力有所加强;
短句来源
     It was found that the dimerization speed decreases with increasing the electron donating ability of the substituents.
     光二聚反应具有高度立体选择性且几乎是定量完成的 . 研究发现 ,随着取代基供电子能力的提高 ,光二聚反应速率下降 .
短句来源
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  “electron donating”译为未确定词的双语例句
     (2) TPA cross-section (δ_(TPA)) The largest δ_(TPA)of NT-G1 is 215GM, however, δ_(TPA) is as high as 454GM for NO-G1 and 377GM for SO-G1. Indicating that electron donating ability of rigid conjugated central core may have more effective in enhancement of charge redistribution.
     (2)双光子吸收截面(δ_(TPA)):NT-G1的双光子吸收截面为215GM,而NO-G1和SO-G1的双光子吸收截面分别为454GM和377GM。 发色团NO-G1比SO-G1表现出更高的δ_(TPA),由于它具有“D-A-D’-A-D”pn结模式特征。
短句来源
     As the substituted group on the pyridine ligand becomes more electron donating from H to CH3, OH, NH2, or CH2-PTZ, the stability of the ligand and the dyes increased;
     随着铼联吡啶染料中吡啶配体环上取代基供电能力的增强,H<CH_3<OH<NH_2<CH_2-PTZ,配体及染料的稳定性提高;
短句来源
     4.when substitued positions of the substituent R on the benzene ring are the same,the λ max values are increased with the incrense of the electron donating ability (CH 3
     苯环上 R取代位置相同时 ,λmax值随 R基给电子能力 ( CH3
短句来源
     The first ionization energy (11.08 eV) of PPN is lower than that (11.42 eV) of PAN, which shows that PPN possesses more potent bioactivity than PAN, which is attributed to the electron donating action of the increasing "CH_2" group.
     而PPN的第一电离能 11.0 8eV低于PAN的 11.42eV ,是由于PPN分子中增加的“CH2 ”基团电子的给予作用 ,这为PPN应具有较大的生物毒性提供合理的解释 .
短句来源
     The intermediate Cp2Ti(C(O)CH2Ph)CH2Ph is labile and quickly eliminates benzyl and phenylacetyl group to produce dibenzyl ketone. The reaction velocity is enhanced by the presence of electron donating group on the phenyl ring (Me>t-Bu>H>F>Cl).
     反应随着取代基给电子能力的增加而加快(Me>t-Bu≈H>F>Cl)。 中间体Cp_2Ti[C(O)CH_2Ph]CH_2Ph很活泼,迅速发生分子内消除,消除的苄基和苯乙酰基生成二苄基酮。
短句来源
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  相似匹配句对
     The effect of the electron-donating groups on the electronic spectrum was investigated.
     探讨了给电子基团对电子吸收光谱的影响。
短句来源
     Life and Electron
     生命与电子
短句来源
     Free electron
     自由電子
短句来源
     Anodic polarization enhances the adsorption of benzene with electron-donating group.
     g-1.说明不同取代基的苯衍生物,电吸附改变量不相同,供电子基团的单取代苯,正极化都能明显增强其吸附量;
短句来源
     Donating Blood in Canada
     在加拿大经历献血
短句来源
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  electron donating
The effect of Q+ OH- was studied, which is formed in NaOH solution used for anion exchange with PTC, on CO substitution of molybdenum hexacarbonyl complex by strong electron donating ligand, 2,2'-bipyridine.
      
The two sulfated zirconias proved to be appropriate catalysts for acylations of aromatic compounds containing electron donating substituents, e.g., for syntheses of several aromatic ketones.
      
The characteristics are examined of redox photocatalytic systems based on semiconductors containing both electron accepting and electron donating additives which are able to separate the photogenerated charges.
      
The Mo-C distance tends to decrease with increasing electron donating ability of the EMe3 group.
      
The effects of the reaction conditions, the nature of the substituent at the apical carbon atom, the electron donating phosphine substituent, and the substituent in the metal cluster framework have been discussed.
      
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The kinetics of protolysis of arylmercuric chlorides, XC_6H_4HgCl(X=p-CH_3, o-CH_3, m-CH_3, H), with HCl in the presence of sodium iodide as catalyst was studied in 90% aqueous dioxane. The conversion was determined by titrating the unreacted HCl. The protolytic reaction has been found to be second order overall, first order in each reactant.At 15-55℃, the rate constants k_2were 3. 98—114.05 l·mol~(-1)·sec~(-1);the activation energies(in Kcal.mol~(-1)),the In A and entropies(in e.u.)were 19.47-20.83, 34.65-36.94...

The kinetics of protolysis of arylmercuric chlorides, XC_6H_4HgCl(X=p-CH_3, o-CH_3, m-CH_3, H), with HCl in the presence of sodium iodide as catalyst was studied in 90% aqueous dioxane. The conversion was determined by titrating the unreacted HCl. The protolytic reaction has been found to be second order overall, first order in each reactant.At 15-55℃, the rate constants k_2were 3. 98—114.05 l·mol~(-1)·sec~(-1);the activation energies(in Kcal.mol~(-1)),the In A and entropies(in e.u.)were 19.47-20.83, 34.65-36.94 and 0.20-4.75, respectively. The rate constants k_2 of 14 different kinds of arylmercuric chlorides measured at the same temperature may be arranged in the following order: p-CH3O>p-CH_3>o-CH_3>m-CH_3>m-CH3O>m-OH>H>p-Cl>m-Cl>m-CO_2C_2H_5>m-Br>p-CO_2C_2H_5>p-NO_2>m-NO_2. It is evident that with respect to hydrogen atom the electron-donating substituents acelerate the reaction and the electron-withdrawing substituents decelerate it. It has been shown that the effect of meta- and para-substituents was consistent with the Hammett-Brown equation(p=-1.42) and the Yukawa-Tsuno equation could also be applied to this reaction (r=1.143). UV spectroscopic studies indicated that with sodium iodide arylmercuric chlorides formed complexes. XC_6H_4HgCl-NaI.It is proposed that the polarization of C-Hg bond is enhanced by complexation with sodium iodide,therefore both the nucleophilicity of carbon atom and the protolytic reactivity of arylmercuric chlorides are increased

本文研究了氯化芳基示XC_6H_4HgCl(x=p-CH_3,o-CH_3,m-CH_3,H)与氯化氢(碘化钠)在90%对氧陆圜水溶液中的反应动力学。证明反应总为二级。以氯化对甲苯汞为例,证明对氯化芳基汞与氯化氢各为一级。温度在15—55℃时,速率常数k_2=3.98—114.05升/克分子·分,活化能E=19.47-20.83千卡/克分子,lnA=34.65-36.94,活化(火啇)△S_(25°)~≠=0.20-4.75卡/克分子·度。

Results of EPR investigation of the electron transfer between strong electron accepting agent (tetracyano-ethylene, TCNE), strong oxidizing agents (quinones) or dual electron donor-acceptors (aromatics with condensed rings) and γ-Al2O3 or HF treated γ-Al2O3 are reported. These suggest that there are rather strong electron accepting sites on the surface of γ-A12O3, onto which aromatics of condensed rings are being adsorbed and changed into cationic free radicals whose concentration magnitude is in the order of...

Results of EPR investigation of the electron transfer between strong electron accepting agent (tetracyano-ethylene, TCNE), strong oxidizing agents (quinones) or dual electron donor-acceptors (aromatics with condensed rings) and γ-Al2O3 or HF treated γ-Al2O3 are reported. These suggest that there are rather strong electron accepting sites on the surface of γ-A12O3, onto which aromatics of condensed rings are being adsorbed and changed into cationic free radicals whose concentration magnitude is in the order of 1015 spins/gm. Meanwhile, there are also strong electron donating sites on the surface of r-Al2O3, onto which TCNE and quinones are being adsorbed and trans formed into anionic free radicals, whose concentration magnitude is in the order of 1017 spins/gm. When γ-Al2O3 was treated with HF to contain 8.4% of F, its corresponding electron accepting strength is increased two order while its corresponding electron donating strength is decreased one order of magnitude.

本文报道了用电子顺磁共振法考察γ-Al_2O_3和经HF交换的F-γ-Al_2O_3分别与强吸电子剂(四氰乙烯)、强氧化剂(醌类)和具有电子授受二性物(稠环芳烃)进行电子转移反应的结果。认为在γ-Al_2O_3表面上存在着具有较强电子受体特性中心,稠环芳烃吸附于其上并把π电子转移给它,生成正离子自由基,其强度为10~(15)自旋数/克量级;同时也存在着具有强电子授体特性中心,四氰乙烯和醌氢醌吸附于其上并夺得其电子,生成负离子自由基,其强度为10~(17)自旋数/克量级。经过氟交换后的F-γ-Al_2O_3的吸电子的能力增加两个数量级,而给电子的能力则相应地降低一个数量级。

We have studied and verified that the UV absorption spectra of the charge-transfer complexes (CTC) formed by various aromatic amines as electron-donors with various electron-acceptors are closely related to their structures. Instead of forming peaks only some broadening of the absorption band was observed for the system composed of weak electron-acceptors and aromatic amines. Only strong electron-acceptors, such as tetracya-noethylene, showed a new peak when forming CTC with aromatic...

We have studied and verified that the UV absorption spectra of the charge-transfer complexes (CTC) formed by various aromatic amines as electron-donors with various electron-acceptors are closely related to their structures. Instead of forming peaks only some broadening of the absorption band was observed for the system composed of weak electron-acceptors and aromatic amines. Only strong electron-acceptors, such as tetracya-noethylene, showed a new peak when forming CTC with aromatic amines. The UV absorption showed peak increasingly larger bathochromic shift both with increasing electron-accepting power of the acceptors and with increasing electron-donating power of the aromatic amines, i.e. with electron-donating substituting group on the benzene ring or with more substituting alkyl groups on the nitrogen atom of the amine molecule.

芳香胺与电子受体相互作用形成的电荷转移复合物(CTC)的吸收峰位置与两者的结构有关。弱的电子受体使芳胺紫外吸收峰加宽,而强的电子受体如四氰基乙烯(TCNE)与芳胺作用产生的CTC显示新峰。受体的受电子能力越强,新峰红移越多。芳胺苯环上氨基对位的取代基给电子能力越强,氮原子上烷基取代基越多,其与受体形成的CTC的吸收峰红移也越多。

 
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