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Defying decomposition: the curious case of choline chloride

Author

Listed:
  • Adriaan van den Bruinhorst

    (École Normale Supérieure de Lyon and CNRS, Laboratoire de Chimie, Ionic Liquids Group)

  • Jocasta Avila

    (École Normale Supérieure de Lyon and CNRS, Laboratoire de Chimie, Ionic Liquids Group)

  • Martin Rosenthal

    (KU Leuven)

  • Ange Pellegrino

    (École Normale Supérieure de Lyon and CNRS, Laboratoire de Chimie, Ionic Liquids Group)

  • Manfred Burghammer

    (ESRF, The European Synchrotron)

  • Margarida Costa Gomes

    (École Normale Supérieure de Lyon and CNRS, Laboratoire de Chimie, Ionic Liquids Group)

Abstract

Chemists aim to meet modern sustainability, health, and safety requirements by replacing conventional solvents with deep eutectic solvents (DESs). Through large melting point depressions, DESs may incorporate renewable solids in task-specific liquids. Yet, DES design is complicated by complex molecular interactions and a lack of comprehensive property databases. Even measuring pure component melting properties can be challenging, due to decomposition before melting. Here we overcame the decomposition of the quintessential DES constituent, choline chloride (ChCl). We measured its enthalpy of fusion (13.8 ± 3.0 kJ ⋅ mol) and melting point (687 ± 9 K) by fast scanning calorimetry combined with micro-XRD and high-speed optical microscopy. Our thermodynamically coherent fusion properties identify ChCl as an ionic plastic crystal and demonstrate negative deviations from ideal mixing for ChCl—contradicting previous assumptions. We hypothesise that the plastic crystal nature of ammonium salts governs their resilience to melting; pure or mixed. We show that DESs based on ionic plastic crystals can profit from (1) a low enthalpy of fusion and (2) favourable mixing. Both depress the melting point and can be altered through ion selection. Ionic plastic crystal-based DESs thus offer a platform for task-specific liquids at a broad range of temperatures and compositions.

Suggested Citation

  • Adriaan van den Bruinhorst & Jocasta Avila & Martin Rosenthal & Ange Pellegrino & Manfred Burghammer & Margarida Costa Gomes, 2023. "Defying decomposition: the curious case of choline chloride," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42267-6
    DOI: 10.1038/s41467-023-42267-6
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    References listed on IDEAS

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    1. Bing Li & Yukinobu Kawakita & Seiko Ohira-Kawamura & Takeshi Sugahara & Hui Wang & Jingfan Wang & Yanna Chen & Saori I. Kawaguchi & Shogo Kawaguchi & Koji Ohara & Kuo Li & Dehong Yu & Richard Mole & T, 2019. "Colossal barocaloric effects in plastic crystals," Nature, Nature, vol. 567(7749), pages 506-510, March.
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