Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra, Difference Spectra, Second Order Difference Spectra in the UV-Visible Spectra  

结合除谱，差谱，二阶差谱的二氯化铜水溶液中直接接触离子对的紫外可见吸收光谱研究

作　　者：鞠思文 张宁[2] 王志强 张睿挺 曾德文[3] 邵晓鹏 林珂 

机构地区：[1]西安电子科技大学物理与光电工程学院,西安710071 [2]中南林业科技大学理学院,长沙410004 [3]中南大学化学化工学院,长沙410083

出　　处：《Chinese Journal of Chemical Physics》2017年第6期657-663,I0001,I0002,共9页化学物理学报（英文）

摘　　要：The microstructure of aqueous CuCl2 has been studied through lots of technologies for many years; however, it remains a controversial subject. In this study, a new spectroscopic method has been proposed to analyze the UV-visible spectra of thin fihn of CuCl2/H2O solutions at different concentrations. This method is the combination of ratio spectra, difference spectra and second order difference spectra. By using this method, two new bands at -230 and -380 nm are obviously observed. The bands are assigned as the contacted ion pairs [CuCl3（H2O）n]- or [CuCl4（H2O）n]2-, which demonstrates that ion pairs exist in the CuCl2/H2O solution. Such finding agrees with the recent theoretical spectra obtained by time-dependent density functional theory. Furthermore, the populations of the contacted ion pairs are discussed. This study not only offers the direct spectroscopic evidence of [CuCl3（H2O）n]- or [CuCl4（H2O）n]2- in aqueous CuCl2, but also suggests that the spec- troscopic analysis method is powerful to extract the weak bands in a strong overlapping spectrum.

关 键 词：UV-visible spectroscopy Ratio spectra Difference spectra CuCl2/H2O solution Ion pair 

分 类 号：O[理学]