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Study of the chemical mechanism involved in the formation of tungstite in benzyl alcohol by the advanced QEXAFS technique

机译:先进QEXAFS技术研究苄醇中钨酸盐形成的化学机理。

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摘要

Insight into the complex chemical mechanism for the formation of tungstite nanoparticles obtained by the reaction of tungsten hexachloride with benzyl alcohol is presented herein. The organic and inorganic species involved in the formation of the nanoparticles were studied by time-dependent gas chromatography and X-ray diffraction as well as by time-resolved in situ X-ray absorption near-edge structure and extended X-ray absorption fine structure spectroscopy. Principal component analysis revealed two intermediates, which were identified as WCl _4 and WOCl _4 by using linear combination analysis. Quick-scanning extended X-ray absorption fine structure spectroscopy enabled the time-dependent evolution of the starting compound, the intermediates and the product to be monitored over the full reaction period. The reaction starts with fast chlorine substitution and partial reduction during the dissolution of the tungsten hexachloride in benzyl alcohol followed by the generation of intermediates with W=O double bonds and finally the construction of the W-O-W network of the tungstite structure.
机译:本文介绍了通过六氯化钨与苯甲醇的反应获得的形成钨矿纳米颗粒的复杂化学机理。通过时间依赖性气相色谱和X射线衍射以及时间分辨的原位X射线吸收近边缘结构和扩展的X射线吸收精细结构,研究了与纳米颗粒形成有关的有机和无机物种。光谱学。主成分分析显示了两种中间体,通过线性组合分析将其鉴定为WCl _4和WOCl _4。快速扫描的扩展X射线吸收精细结构光谱学使得能够在整个反应期间内监控起始化合物,中间体和产物的时间依赖性演变。反应开始于快速的氯取代和六氯化钨在苄醇中的溶解过程中的部分还原,然后生成具有W = O双键的中间体,最后构造了钨矿结构的W-O-W网络。

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