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首页> 外文期刊>Chemistry: A European journal >Organic Reactions and Nanoparticle Preparation in CO_2-Induced Water/P104/p-Xylene Microemulsions
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Organic Reactions and Nanoparticle Preparation in CO_2-Induced Water/P104/p-Xylene Microemulsions

机译：CO_2诱导的水/ P104 /对二甲苯微乳液中的有机反应和纳米粒子的制备

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摘要

Nanometer-sized gold particles are synthesis by the reduction of HauCl_4 with KBH_4 in the CO_2-induced microemulsion of (EO)_27(PO)_61(EO)_27 (P104; EO = ethylene oxide, PO = propylene oxide)/p-ethylene/CO_2/H_2O. The recover of gold particles from the microemulsion can be easily accomplished by the venting of CO_2, while the surfactant remains in the organic phase. The effect of the molar ratio of the reductant to HauCl_4, the concentration of the reactants, and the molar ratio of water to EO segments (W_0) in the reverse micelles on the size of the gold particles is studied. The hydrolysis of benzoyl chloride (BzCl) and p-nitrophenyl chloroformate (NPhCl) has also been carried out in the microemulsion. The results show that the observed rate constant k_obs of both substrates increase significantly with W_0, and that W_0 has a larger influence on the hydrolysis of BzCl. The different extents of the influence of W_0 on the two reactions can be ascribed to the different reaction mechanisms and the expected changes in nucleophilicity and polarity of water in the reverse micelles.
机译：通过在CO_2诱导的（EO）_27（PO）_61（EO）_27（P104; EO =环氧乙烷，PO =环氧丙烷）/ p-乙烯的微乳液中通过HauhCl_4与KBH_4的还原来合成纳米级金颗粒/ CO_2 / H_2O。通过表面活性剂保留在有机相中，通过排放CO_2可以轻松地从微乳液中回收金颗粒。研究了反胶束中还原剂与HauCl_4的摩尔比，反应物的浓度以及水与EO链段的摩尔比（W_0）对金颗粒尺寸的影响。在微乳液中还进行了苯甲酰氯（BzCl）和对硝基苯基氯甲酸酯（NPhCl）的水解。结果表明，观察到的两种底物的速率常数k_obs随W_0显着增加，并且W_0对BzCl的水解影响更大。 W_0对两个反应的影响程度不同，可以归因于不同的反应机理以及反胶束中水的亲核性和极性的预期变化。

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