Observation of One Process in a Phase Transfer Catalytic Reaction at a Liquid/Liquid Interface by Using the Quasi-Elastic Laser Scattering Method
Observation of One Process in a Phase Transfer Catalytic Reaction at a Liquid/Liquid Interface by Using the Quasi-Elastic Laser Scattering Method
复制标题
利用准弹性激光散射法观察液/液界面相转移催化反应的一个过程
DOI：
10.1021/jp984756k
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发表时间：
1999
影响因子：
3.3
通讯作者：
T. Sawada
中科院分区：
文献类型：
--
作者：
Y. Uchiyama;I. Tsuyumoto;T. Kitamori;T. Sawada
用准弹性激光散射(QELS)方法研究了相转移催化剂四丁基溴化铵(TBAB)的界面行为。在水相中，四丁基溴化铵与苯氧钠形成离子对(TBA+C6H5O-)。这种离子对从水相转移到有机相，在那里它与二苯基磷酰氯(DPPC)反应。用QELS方法研究了水/硝基苯(W/NB)界面相转移催化反应中的这一过程。当TBAB浓度大于50 mM时，在W/Nb界面平衡时，TBAB浓度与C6H5ONa浓度之比为1。另一方面，当TBAB浓度低于50 mM时，这一比率低于1。结果表明，四丁基三甲基溴化铵与C6H5ONa的反应位置随四丁基三甲基溴化铵浓度的变化而变化，反应部位在50 mm以上的水相中，而在50 mm以下的界面上。
The interfacial behavior of a phase transfer catalyst, tetrabutylammonium bromide (TBAB), was investigated by the quasi-elastic laser scattering (QELS) method. TBAB forms an ion pair (TBA+C6H5O-) with sodium phenoxide (C6H5ONa) in a water phase. This ion pair moves from the water phase to the organic phase where it reacts with diphenylphosphoryl chloride (DPPC). This one process in the phase transfer catalytic reaction at a water/nitrobenzene (W/NB) interface was investigated by the QELS method. When the TBAB concentration was above 50 mM, the ratio of TBAB concentration to C6H5ONa in equilibrium at the W/NB interface was unity. On the other hand, when the TBAB concentration was below 50 mM, the ratio was below unity. These results suggested that the reaction place between TBAB and C6H5ONa changed with TBAB concentration; the reaction place was in the water phase above 50 mM, whereas it was at the interface below 50 mM.