Binding CO2 by a Cr8 Metallacrown
Iñigo J Vitórica-Yrezábal1, Daniel Florin Sava1, Grigore A Timco1
1School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
Angewandte Chemie (International Ed. in English)
|April 14, 2017
Summary
The novel chromium-8 metallacrown selectively captures carbon dioxide (CO2) over nitrogen (N2). This selectivity is attributed to fluorine interactions within the metallacrown
Area of Science:
- Inorganic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Metallacrowns are coordination compounds with unique cage-like structures.
- Selective gas adsorption is crucial for applications like carbon capture and gas separation.
Purpose of the Study:
- To investigate the gas adsorption properties of the {Cr8} metallacrown.
- To understand the mechanism of selective CO2 adsorption.
Main Methods:
- Synthesis and single-crystal X-ray diffraction of the {Cr8} metallacrown.
- Gas absorption studies to evaluate CO2 and N2 uptake.
- Density Functional Theory (DFT) calculations to model interactions.
Main Results:
- The {Cr8} metallacrown, [CrF(O2C tBu)2]8, exhibits high selectivity for CO2 over N2.
- X-ray diffraction confirmed the presence of a fluorine-lined internal cavity.
- DFT calculations and absorption studies revealed multiple fluorine-CO2 interactions (C···F distances of 3.190(9)-3.389(9) Å).
Conclusions:
- The fluorine-lined cavity of the {Cr8} metallacrown facilitates selective CO2 binding.
- This study demonstrates a promising new material for selective carbon dioxide capture.
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