4.8 Review

The Nature of Carbon Dioxide in Bare Ionic Liquids

Journal

CHEMSUSCHEM
Volume 13, Issue 12, Pages 3101-3109

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000574

Keywords

bicarbonate; buffer solutions; CO2 capture; ionic liquids; water activation

Funding

  1. CNPq [406260/2018-4, 406750/2016-5, 465454/2014-3]
  2. CAPES [195052/ 2018-00, 001]
  3. FAPERGS [18/2551-0000561-4]
  4. FCT- FundacAo para a Ciencia e a Tecnologia, Portugal [PTDC/QUI-QFI/31508/2017]
  5. Fundacion SENECA [20790/PI/18]
  6. Spain (MICINN) [RTI2018-098233-B-C21]
  7. Fundação para a Ciência e a Tecnologia [PTDC/QUI-QFI/31508/2017] Funding Source: FCT

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Ionic liquids (ILs) are among the most studied and promising materials for selective CO2 capture and transformation. The high CO2 sorption capacity associated with the possibility to activate this rather stable molecule through stabilization of ionic/radical species or covalent interactions either with the cation or anion has opened new avenues for CO2 functionalization. However, recent reports have demonstrated that another simpler and plausible pathway is also involved in the sorption/activation of CO2 by ILs associated with basic anions. Bare ILs or IL solutions contain almost invariable significant amounts of water and through interaction with CO2 generate carbonates/bicarbonates rather than carbamic acids or amidates. In these cases, the IL acts as a base and not a nucleophile and yields buffer-like solutions that can be used to shift the equilibrium toward acid products in different CO2 reutilization reactions. In this Minireview, the emergence of IL buffer-like solutions as a new reactivity paradigm in CO2 capture and activation is described and analyzed critically, mainly through the evaluation of NMR data.

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