FTIR and EXAFS investigations of microstructures of gold solvent extraction：hydrogen bonding between modifier and Au（CN）2^—

• 作者: GangMa TiandouHu
• 来源期刊: 同步辐射装置用户科技论文集
• 学科: 工学
• 关键词: 金 溶剂提取 微结构研究
• 年，卷（期）: 1999,（1）
• 页码范围: 1-7
• 页数: 7页
• 分类号: TF831

摘要

The microstructures of loaded organic phases of three quaternary amine solvent extraction systems for gold,which were N263-xylene,N263-tributyl phosphate(TBP)-dodecane and N263-2 -ethylhexanol (isooctanol)-dodecane(N263-trialkylmethylammonium chloride;alkyl=C8-C10),were studied by Fourier transform infrared (FTIR) spectroscopy and extended X-ray abso\rption fine structure(EXAFS) spectroscopy. According to the EXAFS results,it was found that the gold coordination environment was the same before and after extraction.However,the C≡N stretching vibrations of Au(CN)2-were also found to be different,In order to explain the differences in the IR characteristics of C≡N in the three extraction systems,three microstructure models are proposed.For the N263-xylene system,the model is a simple ion pair.For the other two systems with a modifier(TBP and isooctanol),the models are two supramolecular structues based on hydrogen bonding between the modifier and Au(CN)2^-.Some related work such as on the hydration of acetonitrile and the fine structure of C≡N in solid K Au(CN)2 was also performed in order to offer additional supporting evidence for the reliability of the proposed models.