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Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra, Difference Spectra, Second Order Difference Spectra in the UV-Visible Spectra
Si-wen Ju1, Ning Zhang2, Zhi-qiang Wang1, Rui-ting Zhang1, De-wen Zeng3, Xiao-peng Shao1, Ke Lin1
1.School of Physics and Optoelectronic Engineering, Xidian University, Xi'an 710071, China;2.College of Science, Central South University of Forestry and Technology, Changsha 410004, China;3.College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
Abstract:
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 film 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 spectroscopic analysis method is powerful to extract the weak bands in a strong overlapping spectrum.
Key words:  UV-visible spectroscopy  Ratio spectra  Difference spectra  CuCl2/H2O solution  Ion pair
FundProject:This work was supported by the National Natural Science Foundation of China (No.21473171, No.21703164, and No.51134007), the National Basic Research Program of China (No.2014CB643401), the Fundamental Research Funds for the Central Universities (No.JB160508), and the Huashan Mountain Scholar Program and the 111 Project (No.B17035).
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
鞠思文1, 张宁2, 王志强1, 张睿挺1, 曾德文3, 邵晓鹏1, 林珂1
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
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DOI:10.1063/1674-0068/30/cjcp1711211
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