Laser photolysis studies of quaternary ammonium ionic liquids aqueous solution

Laser photolysis studies of quaternary ammonium ionic liquids aqueous solution The reactions between quaternary ammonium ionic liquids ([Me3NC2H4OH]+[Zn2Cl5]−, abbrev. Ch-Zn2Cl5) and one-electron oxidant (SO 4 •− ), have been studied by nano-second laser photolysis techniques. The mechanism of monophotonic ionization by 266 nm laser excitation was suggested and the quantum yield was estimated to be 0.04. The second-order decay rate constant of SO 4 •− oxidation reactions at 460 nm, 1.3 × 109 M−1 s−1, was almost equal to the product rate constant of 1.5 × 109 M−1 s−1 at 320 nm in Ch-Zn2Cl5 aqueous solution showing that the decay and the product were synchronic. Comparison of Ch-Zn2Cl5 with chloride choline and ZnCl2 showed that the anion Zn2Cl5 − played an important role in photoionization while choline cation had little function on its photolysis and radiolysis. The present study would be helpful for understanding the application of ionic liquids in the field of electrochemical deposition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Laser photolysis studies of quaternary ammonium ionic liquids aqueous solution

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Publisher
Springer Journals
Copyright
Copyright © 2010 by Springer Science+Business Media B.V.
Subject
Chemistry; Inorganic Chemistry ; Physical Chemistry ; Catalysis
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-010-0226-2
Publisher site
See Article on Publisher Site

Abstract

The reactions between quaternary ammonium ionic liquids ([Me3NC2H4OH]+[Zn2Cl5]−, abbrev. Ch-Zn2Cl5) and one-electron oxidant (SO 4 •− ), have been studied by nano-second laser photolysis techniques. The mechanism of monophotonic ionization by 266 nm laser excitation was suggested and the quantum yield was estimated to be 0.04. The second-order decay rate constant of SO 4 •− oxidation reactions at 460 nm, 1.3 × 109 M−1 s−1, was almost equal to the product rate constant of 1.5 × 109 M−1 s−1 at 320 nm in Ch-Zn2Cl5 aqueous solution showing that the decay and the product were synchronic. Comparison of Ch-Zn2Cl5 with chloride choline and ZnCl2 showed that the anion Zn2Cl5 − played an important role in photoionization while choline cation had little function on its photolysis and radiolysis. The present study would be helpful for understanding the application of ionic liquids in the field of electrochemical deposition.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Nov 28, 2010

References

  • Applications of ionic liquids in the chemical industry
    Plechkova, NV; Seddon, KR
  • Ionic liquids as catalytic green solvents for nucleophilic displacement reactions
    Wheeler, C; West, KN; Liotta, CL; Eckert, CA
  • Great increase of the electrical conductivity of ionic liquids in aqueous solutions
    Vila, J; Gines, P; Rilo, E; Cabeza, O; Varela, LM
  • Monophotonic ionization of etoposide in aqueous solution by 248 nm laser light: identification of transient intermediates
    Lu, CY; Wang, WF; Lin, WZ; Han, ZH; Pan, JX; Yao, SD; Lin, NY

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