Understanding the interactions between the bis(trifluoromethylsulfonyl)imide anion and absorbed CO 2 using X-ray diffraction analysis of a soft crystal surrogate
The selective carbon dioxide (CO ) absorption properties of ionic liquids (ILs) are highly pertinent to the development of methods to capture CO . Although it has been reported that fluorinated components give ILs enhanced CO solubilities, it has been challenging to gain a deep understanding of the...
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Published in | Communications chemistry Vol. 3; no. 1; p. 143 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
27.10.2020
|
Online Access | Get full text |
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Summary: | The selective carbon dioxide (CO
) absorption properties of ionic liquids (ILs) are highly pertinent to the development of methods to capture CO
. Although it has been reported that fluorinated components give ILs enhanced CO
solubilities, it has been challenging to gain a deep understanding of the interactions occurring between ILs and CO
. In this investigation, we have utilized the soft crystalline material [Cu(NTf
)
(bpp)
] (NTf
= bis(trifluoromethylsulfonyl)imide, bpp = 1,3-bis-(4-pyridyl)propane) as a surrogate for single-crystal X-ray diffraction analysis to visualize interactions occurring between CO
and NTf
, the fluorinated IL component that is responsible for high CO
solubility. Analysis of the structure of a CO
-loaded crystal reveals that CO
interacts with both fluorine and oxygen atoms of NTf
anions in a trans rather than cis conformation about the S-N bond. Theoretical analysis of the structure of the CO
-loaded crystal indicates that dispersion and electrostatic interactions exist between CO
and the framework. The overall results provide important insight into understanding and improving the CO
absorption properties of ILs. |
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ISSN: | 2399-3669 |