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Title: Abstraction of Nano Copper in a Room Temperature Ionic Liquid

Abstract

Speciation of copper in the abstraction of nano copper with a room temperature ionic liquid (RTIL) (1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6]) has been studied by X-ray absorption near edge structural (XANES) and extended X-ray absorption fine structural (EXAFS) spectroscopies in the present work. The least-square fits of the XANES spectra suggest that nano CuO (79%) and Cu(II) complex (Cu(II)-IL) (21%) are the main copper species in the RTIL. The fitted EXAFS spectra show that the Cu-O (1st shell) bond distance is 2.08 A with a coordination number (CN) of 2.6. In the second shells of copper, the average bond distance of Cu-Cu is 2.99 A with a CN of 5.1.

Authors:
;  [1];  [1];  [2];  [3]
  1. Department of Environmental Engineering, National Cheng Kung University, Tainan City, Taiwan (China)
  2. (China)
  3. Department of Environmental Science and Engineering, TungHai University, Taichung City, Taiwan (China)
Publication Date:
OSTI Identifier:
21054745
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 882; Journal Issue: 1; Conference: XAFS13: 13. international conference on X-ray absorption fine structure, Stanford, CA (United States), 9-14 Jul 2006; Other Information: DOI: 10.1063/1.2644665; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTRA; ABSORPTION SPECTROSCOPY; BOND LENGTHS; CHEMICAL BONDS; CHEMICAL STATE; COORDINATION NUMBER; COPPER; COPPER OXIDES; FINE STRUCTURE; LEAST SQUARE FIT; NANOSTRUCTURES; ORGANIC COMPOUNDS; X-RAY SPECTRA; X-RAY SPECTROSCOPY

Citation Formats

Peng, C. Y., Huang, C. H., Wang, H. Paul, Sustainable Environment Research Center, National Cheng Kung University, Tainan City, Taiwan, and Wei Yuling. Abstraction of Nano Copper in a Room Temperature Ionic Liquid. United States: N. p., 2007. Web. doi:10.1063/1.2644665.
Peng, C. Y., Huang, C. H., Wang, H. Paul, Sustainable Environment Research Center, National Cheng Kung University, Tainan City, Taiwan, & Wei Yuling. Abstraction of Nano Copper in a Room Temperature Ionic Liquid. United States. doi:10.1063/1.2644665.
Peng, C. Y., Huang, C. H., Wang, H. Paul, Sustainable Environment Research Center, National Cheng Kung University, Tainan City, Taiwan, and Wei Yuling. Fri . "Abstraction of Nano Copper in a Room Temperature Ionic Liquid". United States. doi:10.1063/1.2644665.
@article{osti_21054745,
title = {Abstraction of Nano Copper in a Room Temperature Ionic Liquid},
author = {Peng, C. Y. and Huang, C. H. and Wang, H. Paul and Sustainable Environment Research Center, National Cheng Kung University, Tainan City, Taiwan and Wei Yuling},
abstractNote = {Speciation of copper in the abstraction of nano copper with a room temperature ionic liquid (RTIL) (1-butyl-3-methylimidazolium hexafluorophosphate [C4mim][PF6]) has been studied by X-ray absorption near edge structural (XANES) and extended X-ray absorption fine structural (EXAFS) spectroscopies in the present work. The least-square fits of the XANES spectra suggest that nano CuO (79%) and Cu(II) complex (Cu(II)-IL) (21%) are the main copper species in the RTIL. The fitted EXAFS spectra show that the Cu-O (1st shell) bond distance is 2.08 A with a coordination number (CN) of 2.6. In the second shells of copper, the average bond distance of Cu-Cu is 2.99 A with a CN of 5.1.},
doi = {10.1063/1.2644665},
journal = {AIP Conference Proceedings},
number = 1,
volume = 882,
place = {United States},
year = {Fri Feb 02 00:00:00 EST 2007},
month = {Fri Feb 02 00:00:00 EST 2007}
}
  • The transfer of strontium ion from acidic nitrate media into a series of 1-alkyl-3-methylimidazolium-based room-temperature ionic liquids containing dicyclohexano-18-crown-6 is shown to proceed via cation-exchange, in contrast to conventional solvents such as alkan-1-ols, in which extraction of a strontium nitrato-crown ether complex is observed.
  • Addition of water to 1-decyl-3-methylimidazolium bromide is shown to result in its spontaneous self-organization and the concomitant formation of a liquid-crystalline gel, thus providing a simple means of preparing a supramolecular assembly comprising a room-temperature ionic liquid.
  • Room temperature molten salts composed of the 1-ethyl-3-methylimidazolium cation and a chloroaluminate anion have received much attention for use in a variety of commercial applications such as batteries, photovoltaics, metal deposition, and capacitors. The room temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF{sub 4}) was demonstrated as a versatile electrolyte by examining three representative electrochemical couples: ferrocene and tetrathiafulvalene oxidations and lithium ion reduction. Square-wave voltammetric data for ferrocene oxidation were fit to a reversible one-electron process using the COOL algorithm to give a half-wave potential of 0.490 V vs. Al/Al(III) and a diffusion coefficient of 5.1 {times} 10{sup {minus}7} cm{sup 2}/s.more » The two-electron oxidation of tetrathiafulvalene was reversible and proceeded through two consecutive one-electron steps; although data collected at lower square-wave frequencies indicated a slow precipitation of the TTF{sup +} species. Lithium ion was reduced to lithium metal at a Pt electrode following the addition of water to the EMIBF{sub 4} electrolyte, whereas lithium ion reduction at an Al wire produced the {beta}-LiAl alloy. Conductivities and kinematic viscosities of EMIBF{sub 4} were measured from 20 to 100 C and had values of 14 mS/cm and 0.275 cm{sup 2}/s, respectively, at 25 C.« less
  • The Sr(II)-crown ether complexes formed in a room-temperature ionic liquid (RTIL), 1-methyl-3-pentylimidazolium bis[(trifluoromethyl)sulfonyl]amide, have been studied by X-ray absorption fine structure measurements at the Sr K-edge. When a Sr(NO{sub 3}){sub 2}-crown ether complex is directly dissolved in a water-saturated RTIL, both nitrate ligands and the crown ether coordinate the Sr, as observed in a conventional two-phase water-octanol system. When the cationic Sr-crown ether complex is created in a two-phase water-RTIL system, however, only cationic Sr-crown ether complexes are observed in the RTIL phase. This difference in the coordination complexes arises from differences in the mechanism of cation extraction between themore » RTIL and conventional molecular organic solvents, a finding with important implications for synthesis, catalysis, and ion separations using two-phase water-RTIL systems.« less