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Alkyl(C16, C18, C22)trimethylammonium-Based Herbicidal Ionic Liquids.

Juliusz Pernak1, Rafał Giszter1, Agnieszka Biedziak1

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Journal of Agricultural and Food Chemistry
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PubMed
Summary

New herbicidal ionic liquids (HILs) synthesized from common herbicides show high efficacy and thermal stability. These compounds, particularly those with phenoxyacid anions, demonstrate promising potential for weed control in agricultural applications.

Keywords:
efficacygrowth regulatorsherbicidal ionic liquidslong alkylphenoxyacids

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Area of Science:

  • Agricultural Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Traditional herbicides face challenges with efficacy and environmental impact.
  • Ionic liquids offer tunable physicochemical properties for various applications.
  • Developing novel herbicidal formulations is crucial for sustainable agriculture.

Purpose of the Study:

  • To synthesize and characterize long alkyl chain herbicidal ionic liquids (HILs).
  • To evaluate the physicochemical properties and herbicidal efficacy of novel HILs.
  • To explore the structure-property relationships influencing HIL performance.

Main Methods:

  • Synthesis of HILs via acid-base reactions using common herbicides (2,4-D, MCPA, MCPP, dicamba) and long-chain quaternary ammonium hydroxides.
  • Characterization of physicochemical properties including thermal stability, solubility, surface activity, density, viscosity, and refractive index.
  • Greenhouse and field trials to assess herbicidal efficacy against target weeds.

Main Results:

  • High synthesis efficiency (>95%) achieved for novel HILs.
  • Three MCPP-based HILs exhibited liquid states at room temperature.
  • HILs demonstrated high thermal stability and surface activity.
  • Solubility was significantly influenced by alkyl chain length and anion structure.
  • Greenhouse and field tests confirmed comparable or superior herbicidal efficacy of HILs versus commercial standards, especially those with phenoxyacid anions.

Conclusions:

  • Long alkyl chain HILs based on phenoxyacids show excellent herbicidal activity and stability.
  • Tailoring alkyl chain length and anion structure allows for optimization of HIL properties.
  • These novel HILs represent a promising alternative for effective weed management.