【作者】 黄宇营； 马静远； 邹杨；

【Author】 YY Huang;JY Ma;Y Zou;Shanghai Synchrotron Radiation Facility / Shanghai Institute of Applied Physics, Chinese Academy of Sciences;

【机构】 中国科学院上海应用物理研究所/上海光源；

【摘要】 室温离子液体是一种完全由阴阳离子构成、在室温下或接近室温条件下呈现液态的一类特殊熔融盐。它具有不易燃烧、蒸汽压低、热稳定性高、液态范围宽、可以重复使用和可溶解物质种类广泛等优点[1,2],这使得他们在很多方面都有很大的应用潜力。同步辐射XAFS方法因其元素特征选择性、且不依赖长程有序及样品物理性状的特点,正适合对性状、离子成分多变的离子液体体系进行研究。基于此,我们的工作主要包括以下几个方面:（1）原位条件下研究了辐射诱导条件下离子液体[BMIM][AuCl₄]中Au离子逐渐被还原、最终生成纳米颗粒的反应机理,并由此提出了一个新的纳米金生成机制,其中包含重要的中间体Cl₂Au-AuCl₂[3];（2）分析了不同x（ZnCl₂）摩尔百分含量的[ChCl]-[ZnCl₂]离子液体的熔化转变焓和Zn元素的近邻结构参数,并发现Zn的一个新物种——Cl-ZnCl离子对[4];（3）利用XAFS及紫外吸收光谱两种方法,分析了离子液体1-丁基-3-甲基咪唑溴盐（[BMIM]Br）中逐渐掺入1-丁基-3-甲基咪唑四氟硼酸盐（[BMIM][BF₄]）时,Br-阴离子与咪唑阳离子氢键作用的改变[5]。更多还原

【Abstract】 Room temperature ionic liquids（ILs） are a novel class of organic salts composed of cations and anions,possessing melting point at or close to room temperature.They are attractive materials in many fields,especially in nuclear fuel cycle processing and synthetic chemistry,due to their desirable properties,including non-volatility,high polarity,ease of recycling and high selectivity,etc[1,2].However,the use of ionic liquids is largely dependent upon a thorough understanding of their physical and chemical properties.Although many studies have been performed on ILs,XAFS is rarely used in studying ion structure of them,and there are very few reports in which XAFS is employed to study this kind of novel material.As a proven experimental method,XAFS does not depend on long-range ordered crystal structure,so it is particularly suitable for the study of amorphous structure,such as ILs.In our work,we take advantage of this method to study the structure of different types of ILs and the mechanism of interaction with each other.The major work includes:（1） Observing the evolution of gold nanoparticles from the ionic liquid[BMIM][AuCl₄]irradiated with hard X-ray,and a new reaction mechanism has been reported to explain the generation progress of gold nanoparticles[3];（2） Investigating the components and structures of ionic liquid ChCl-ZnCl₂ in different ChCl:ZnCl₂ ratios,and a new mechanism of interactions between Ch⁺ cation and Cl-Zn-Cl ion pairs or Cl^- is proposed[4].（3） Exploring the charge transfer scenario in the mixture of[BMIM][BF₄]and[BMIM]Br by analyzing the absorption edge shift of Br[5].更多还原