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Deep Eutectic Solvents for Induced Circularly Polarized Luminescence.

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Chiral deep eutectic solvents (DES) enable control over circularly polarized luminescence from lanthanide materials. The choice of hydrogen bond acceptor and donor in DES dictates the emitted light

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Materials emitting circularly polarized light (CPL) are crucial for advanced industries.
  • Chiral deep eutectic solvents (DES) offer potential as media for luminescent lanthanide complexes.
  • Developing novel chiral light-emitting materials requires suitable solvent systems.

Purpose of the Study:

  • To investigate the use of chiral deep eutectic solvents (DES) as solvents for lanthanide-based CPL materials.
  • To explore the influence of DES components on the CPL properties of lanthanide complexes.
  • To understand the thermodynamic basis of chiral discrimination in these DES systems.

Main Methods:

  • Preparation of DES using various hydrogen bond acceptors (tetrabutylammonium/phosphonium chloride) and donors (amino acids: l/d-glutamic acid, l-proline, l-arginine).
  • Dissolution of racemic lanthanide complexes (Eu, Tb, Sm) in the prepared chiral DES.
  • Measurement of induced circularly polarized luminescence (CPL) and thermodynamic parameters.

Main Results:

  • Successful generation of green, orange, and red CPL from lanthanide complexes in chiral DES.
  • The sign of CPL emission is directly controlled by the enantiomer of the amino acid used in the DES.
  • Replacing tetrabutylammonium chloride with tetrabutylphosphonium chloride increased enthalpy and entropy of chiral discrimination by 50%.

Conclusions:

  • Chiral DES are effective solvents for creating chiral light-emitting lanthanide materials.
  • The choice of hydrogen bond acceptor and donor in DES allows for tunable control over CPL properties.
  • This work provides a pathway for designing advanced chiral luminescent materials.