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. 2015 Sep 3:5:13759.
doi: 10.1038/srep13759.

Intermediates in the cation reactions in solution probed by an in situ surface enhanced Raman scattering method

Chih-Shan Tan  1 , Hung-Ying Chen  2 , Hsueh-Szu Chen  2 , Shangjr Gwo  2 , Lih-Juann Chen  1
Affiliations

Intermediates in the cation reactions in solution probed by an in situ surface enhanced Raman scattering method

Chih-Shan Tan et al. Sci Rep. .

Abstract

For chemical reactions in liquid state, such as catalysis, understanding of dynamical changes is conducive to practical applications. Solvation of copper salts in aqueous solution has implications for life, the environment, and industry. In an ongoing research, the question arises that why the color of aqueous CuCl2 solution changes with solution concentration? In this work, we have developed a convenient and efficient in situ surface enhanced Raman scattering technique to probe the presence of many intermediates, some of them are responsible for color change, in crystallization of aqueous copper chloride solution. The versatility of the novel technique was confirmed in the identification of five intermediates states in the transition from CdS to MoS2 nanowires in solution. The facile in situ method is expected to be widely applicable in probing intermediate states in a variety of chemical reactions in solution.

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Figures

Figure 1
Figure 1. Copper chloride aqueous solutions with different mole concentrations.
(a) From left to right, pure water, solutions of copper chloride 0.5 M, 0.75 M, 1 M, 2.5 M, 5 M, 7.5 M, 10 M, 12.5 M, 15 M, and copper chloride dihydrate. (b) UV/Visible transmittance spectra for probing the electronic structures of copper chloride solutions with different concentrations, and H is the transmittance in arbitrary unit. (c) SERS spectra for probing the vibrational structures of copper chloride solutions with different concentrations.
Figure 2
Figure 2. Time dependent in situ SERS (with 2 mW, 514 nm laser) spectra of crystallization of 1 M copper chloride aqueous solution to copper chloride dihydrate.
Figure 3
Figure 3. Time dependent in situ SERS (with 17 mW, 632.8 nm laser) spectra of crystallization of 1 M copper chloride aqueous solution to copper chloride dihydrate.
Figure 4
Figure 4. Illustration of copper chloride aqueous solution crystallization process with four stages.
The green and red lines represent states revealed by the probing of 514 nm (green) and 632.8 nm (red) lasers, respectively.
Figure 5
Figure 5. Time dependent in situ SERS (with 17 mW, 632.8 nm laser) spectra obtained for cation exchange from a single CdS to MoS2 nanowire in 0.1 M Mo ion solution.
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References

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