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离子自由基对
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  radical ion pair
     Excited triplet diene is formed via back electron transfer between radical ion pair within a solvent cage.
     处于溶剂笼中的三重态离子自由基对经电子反传,产生激发三重态二烯。
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  “离子自由基对”译为未确定词的双语例句
     It might be due to unpolar solvent C6D6 disfavoring the charge separation of CTC, leading to no ion radical and no polarization either.
     非极性溶剂C6D6不利于CTC的电荷分离,不能形成离子自由基对中间体,因此无极化现象。
短句来源
     Quenching by electron transfer involves creation of an ion pair. Charge separation and back electron transfer is then a competitived process.
     电子转移生成离子自由基对后,电荷分离与逆电子转移过程相互竞争。
短句来源
     The efficiency of triplet sensitization is much higher than that of singlet sensitization.
     由三重态电子转移产生的三重态离子自由基对进一步反应生成产物的效率比单重态离子自由基对的效率高10倍。
短句来源
     Fluorescence quenching and flash photolysis experiment proved that n-Bu_4NBF_4 could cause the dissociation of the exciplex to form separated radical ions effectively.
     荧光猝灭及激光闪光光解实验证明四正丁基四氟硼酸铵能促进电荷分离过程而生成离子自由基对.
短句来源
     The mechanisms for the reaction of triethylamine with 2 chloro 5 methoxy p benzoquinone in different solvents under UV irradiation were investigated by the chemically induced dynamic nuclear polarization (CIDNP). The results showed that the charge transfer complex (CTC) was first formed and then charge separation occurred to produce ion radical pairs. The back electron transfer caused the methylene of triethylamine to give emission CIDNP polarization.
     用化学诱导动态核极化 (CIDNP)方法研究了三乙胺与 2 氯 5 甲氧基对苯醌在C6 D6 ,CD3CN溶剂中的反应机理 ,实验结果表明反应过程中首先形成基态电荷转移络合物 (CTC) ,在CD3CN中 ,光照电荷分离形成离子自由基对 ,使三乙胺亚甲基产生发射极化信号 .
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  相似匹配句对
     In this paper,classification performances of J. C.
     J C .
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     To D.
     D.
短句来源
     It is unsensitive to metalli cions.
     金属离子不敏感。
短句来源
     Effect of oxygen free radicals on ventricular pacemaker current If1
     氧自由基心室起搏离子流I_f的影响
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     Chiral Ion Pair Chromatography
     手性离子色谱法
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  radical ion pair
The participation of the triplet radical ion pair in the initiation of the chain photosubstitution reaction was directly confirmed.
      
The lifetime of the radical ion pair was estimated.
      
Nucleophilic substitution in these compounds proceeds via the formation of a charge-transfer complex, which converts into a radical ion pair as a result of the electron transfer.
      
We concluded that the key intermediate to determine the radical yield is the triplet exciplex or contact radical ion pair in the 1-propanol and 1-butanol solutions, while it is the solvent-separated radical ion pair in the methanol solution.
      
Upon irradiation of 3,4-di-O-benzyl-hypericin and proton sponge (bis-1,8-N,N-dimethylamino-naphthalene) in benzene solution, a stable radical ion pair formed which exhibited an intense absorption band around 800?nm.
      
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Metal phthalocyanine-sensitized photoreduction of dimethyl 4-nitrophthalate by ascorbic acid has been investigated. The primary photo-reaction products are the corresponding amino- and hydroxylamino-compounds. The azoxy-compound is formed by coupling of the nitroso-compound with hydroxylamino-compound in the presence of air through secondary dark reaction. The redox potential and fluorescence quantum yield are also determined. The variation of the quantum yield for the sensitized photoreduction, the relative...

Metal phthalocyanine-sensitized photoreduction of dimethyl 4-nitrophthalate by ascorbic acid has been investigated. The primary photo-reaction products are the corresponding amino- and hydroxylamino-compounds. The azoxy-compound is formed by coupling of the nitroso-compound with hydroxylamino-compound in the presence of air through secondary dark reaction. The redox potential and fluorescence quantum yield are also determined. The variation of the quantum yield for the sensitized photoreduction, the relative fluorescence quantum yield and their product with the concentration of nitrocompound has been examined. The efficiency of photoreduction sensitized by the singlet and triplet excited states of metal phthalocyanine has also been calculated. It is believed that electron transfer from the excited metal phthalocyanine to the nitro-compound is initial process in the sensitized photoreduction. Quenching by electron transfer involves creation of an ion pair. Charge separation and back electron transfer is then a competitived process. Due to the spin selection rules, the efficiency of photoreduction sensitized by triplet-excited metal phthalocyanine is higher than that sensitized by singlet-excited state. Thus, a necessary requirement for a good sensitizer is that the triplet state is populated in high yield. An alternative way and also the intention of our work is to design a suitable phthalocyanine skeleton to overcome geminate recombination of the ion pair in order to increase the efficiency of photoreduction sensitized by singlet-excited state of the sensitizer, so as to increase the quantum yield of the total sensitized photoreduction.

本文研究了各种金属酞菁以及带有不同取代基的锌酞菁敏化光还原硝基化合物的反应。确定了光敏还原反应的主要产物是氨基和羟氨基化合物;羟氨基化合物与亚硝基化合物通过暗反应缩合生成偶氮N-氧化物。测定了它们的氧化还原电位和荧光量子产率。从敏化光还原反应的量子产率及荧光猝灭与硝基化合物浓度的依赖关系,计算出各种金属酞菁激发单重态与三重态的敏化效率。受激发金属酞菁将电子转移至硝基化合物是敏化光还原反应的起始过程。电子转移生成离子自由基对后,电荷分离与逆电子转移过程相互竞争。由于自旋选择规则的限制,激发三重态的敏化效率一般比激发单重态的敏化效率高。为了提高敏化光还原反应的效率,除选择三重态产率较高的敏化剂外,改变敏化剂的结构可提高敏化剂激发单重态的敏化效率,从而提高敏化光还原反应的量子产率.

N, N, N', N'-tetramethylbenzidine (NTMB) and 3, 3' 5, 5'-tetramethylbenzidine (TMB) photosensitize the extrusion of SO2 from dibenzyl sulfone (DBS) and degradation of polystyrene-sulfone (PSS). .Both singlet and triplet sensitization are observed. An electron transfer mechanism is proposed to explain the results. The efficiency of triplet sensitization is much higher than that of singlet sensitization.

N、N、 N’、N’-四平基对联苯二胺(NTMB)和 3、3’、5、5’-四甲基对联苯二胺(TMB)可以有效地光敏化二苄基砜(DBS)分解和聚苯乙烯砜(PSS)降解。敏化作用是按电子转移机理进行的,电子转移过程可以由NTMB的单重激发态,也可以由三重激发态发生。由三重态电子转移产生的三重态离子自由基对进一步反应生成产物的效率比单重态离子自由基对的效率高10倍。

Isomerization of bicyclo [2, 2, 1]-2,5-hepta-diene to quadricyclo [2, 2, 1, 02.6, 03,5 ]-heptane was investigated using N, N, N', N'-tetramethylbenzidine, 2,6-dimethoxynaphthalene, and 2,7-dimethoxynaphthalene as photosensitizers. The quantum yields of the isomerization were determined and the reaction mechanism was discussed. An exciplex of radical ion pair is formed as intermediate through electron transfer between excited photosensitizer and diene. There is an equilibrium between the excited singlet and triplet...

Isomerization of bicyclo [2, 2, 1]-2,5-hepta-diene to quadricyclo [2, 2, 1, 02.6, 03,5 ]-heptane was investigated using N, N, N', N'-tetramethylbenzidine, 2,6-dimethoxynaphthalene, and 2,7-dimethoxynaphthalene as photosensitizers. The quantum yields of the isomerization were determined and the reaction mechanism was discussed. An exciplex of radical ion pair is formed as intermediate through electron transfer between excited photosensitizer and diene. There is an equilibrium between the excited singlet and triplet radical ion pair. Excited triplet diene is formed via back electron transfer between radical ion pair within a solvent cage. Finally, the excited diene is converted to quadricyclo [2, 2, 1, 02,6, 03,5] -heptane via intramolecular [2 + 2] cycloaddition.

以N,N,N′,N′-四甲基联苯二胺、2,6-二甲氧基萘和2,7-二甲氧基萘为光敏剂,在正己烷溶液中实现了双环[2,2,1]-2,5-庚二烯到四环[2,2,1,0~(2,6),0.(3,5)]庚烷的异构化。测定了反应的量子产率。讨论了反应机理。通过激发态的光敏剂与二烯之间的电子转移反应,形成单重态和三重态处于平衡状态的离子自由基对中间体。处于溶剂笼中的三重态离子自由基对经电子反传,产生激发三重态二烯。最后该激发态二烯经分子内[2+2]环合加成反应异构化为四环烷。

 
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