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Volume 30 Issue 6
Dec.  2017
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Si-wen Ju, Ning Zhang, Zhi-qiang Wang, Rui-ting Zhang, De-wen Zeng, Xiao-peng Shao, Ke Lin. Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra, Difference Spectra, Second Order Difference Spectra in the UV-Visible Spectra[J]. Chinese Journal of Chemical Physics , 2017, 30(6): 657-663. DOI: 10.1063/1674-0068/30/cjcp1711211
Citation: Si-wen Ju, Ning Zhang, Zhi-qiang Wang, Rui-ting Zhang, De-wen Zeng, Xiao-peng Shao, Ke Lin. Contacted Ion Pairs in Aqueous CuCl2 by the Combination of Ratio Spectra, Difference Spectra, Second Order Difference Spectra in the UV-Visible Spectra[J]. Chinese Journal of Chemical Physics , 2017, 30(6): 657-663. DOI: 10.1063/1674-0068/30/cjcp1711211
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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

  • 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

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  • Received Date: November 13, 2017
  • Revised Date: December 19, 2017
    Graphical Abstract
    • 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.
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