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Type II porous ionic liquid based on metal-organic cages that enables l-tryptophan identification

Author

Listed:
  • Zhuxiu Zhang

    (Nanjing Tech University)

  • Baolin Yang

    (Nanjing Tech University)

  • Bingjie Zhang

    (Nanjing Tech University)

  • Mifen Cui

    (Nanjing Tech University)

  • Jihai Tang

    (Nanjing Tech University
    Jiangsu National Synergetic Innovation Centre for Advanced Materials (SICAM))

  • Xu Qiao

    (Nanjing Tech University
    Jiangsu National Synergetic Innovation Centre for Advanced Materials (SICAM))

Abstract

Porous liquids with chemical separation properties are quite well-studied in general, but there is only a handful of reports in the context of identification and separation of non-gaseous molecules. Herein, we report a Type II porous ionic liquid composed of coordination cages that exhibits exceptional selectivity towards l-tryptophan (l-Trp) over other aromatic amino acids. A previously known class of anionic organic–inorganic hybrid doughnut-like cage (HD) is dissolved in trihexyltetradecylphosphonium chloride (THTP_Cl). The resulting liquid, HD/THTP_Cl, is thereby composed of common components, facile to prepare, and exhibit room temperature fluidity. The permanent porosity is manifested by the high-pressure isotherm for CH4 and modeling studies. With evidence from time-dependent amino acid uptake, competitive extraction studies and molecular dynamic simulations, HD/THTP_Cl exhibit better selectivity towards l-Trp than other solid state sorbents, and we attribute it to not only the intrinsic porosity of HD but also the host-guest interactions between HD and l-Trp. Specifically, each HD unit is filled with nearly 5 l-Trp molecules, which is higher than the l-Trp occupation in the structure unit of other benchmark metal-organic frameworks.

Suggested Citation

  • Zhuxiu Zhang & Baolin Yang & Bingjie Zhang & Mifen Cui & Jihai Tang & Xu Qiao, 2022. "Type II porous ionic liquid based on metal-organic cages that enables l-tryptophan identification," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
  • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-30092-2
    DOI: 10.1038/s41467-022-30092-2
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    References listed on IDEAS

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    1. Nicola Giri & Mario G. Del Pópolo & Gavin Melaugh & Rebecca L. Greenaway & Klaus Rätzke & Tönjes Koschine & Laure Pison & Margarida F. Costa Gomes & Andrew I. Cooper & Stuart L. James, 2015. "Liquids with permanent porosity," Nature, Nature, vol. 527(7577), pages 216-220, November.
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