4.8 Review

Toward the Proactive Design of Sustainable Chemicals: Ionic Liquids as a Prime Example

Journal

CHEMICAL REVIEWS
Volume 121, Issue 21, Pages 13132-13173

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.chemrev.0c01265

Keywords

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Funding

  1. Deutsche Forschungsgemeinschaft (DFG) [380298548]
  2. Kurt Eberhard Bode Stiftung
  3. European Research Council [ERC 2014-CoG661 647928]
  4. European Union [713475 - FLIPT - H2020-FETOPEN-2014-2015]
  5. FCT-Fundacao para a Ciencia e a Tecnologia, I.P., Project MOSTMICRO-ITQB [UIDB/04612/2020, UIDP/04612/2020]
  6. Deutsches Stiftungszentrum [T 0122/33742/2019/kg]

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The tailorable properties of ionic liquids drive their implementation into various technologies, with a focus on environmental sustainability. To design more sustainable ILs, selection of beneficial precursors, considering technical properties, and evaluating environmental impacts are crucial. Understanding structure-activity relationships and mechanisms at a molecular level is important for rationalizing design criteria.
The tailorable and often unique properties of ionic liquids (ILs) drive their implementation into a broad variety of seminal technologies. The modular design of ILs allows in this context a proactive selection of structures that favor environmental sustainability.ideally without compromising their technological performance. To achieve this objective, the whole life cycle must be taken into account and various aspects considered simultaneously. In this review, we discuss how the structural design of ILs affects their environmental impacts throughout all stages of their life cycles and scrutinize the available data in order to point out knowledge gaps that need further research activities. The design of more sustainable ILs starts with the selection of the most beneficial precursors and synthesis routes, takes their technical properties and application specific performance into due account, and considers its environmental fate particularly in terms of their (eco)toxicity, biotic and abiotic degradability, mobility, and bioaccumulation potential. Special emphasis is placed on reported structure-activity relationships and suggested mechanisms on a molecular level that might rationalize the empirically found design criteria.

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