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Fluorescence-quenching of a Liposomal-encapsulated Near-infrared Fluorophore as a Tool for In Vivo Optical Imaging

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Fluorescence Quenching by Nitro Compounds within a Hydrophobic Deep Eutectic Solvent.

Divya Dhingra¹, Bhawna¹, Ashish Pandey¹

¹Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

The Journal of Physical Chemistry. B

|May 7, 2020

Summary

This summary is machine-generated.

Hydrophobic deep eutectic solvents (DESs) offer eco-friendly alternatives to organic solvents. Pyrene fluorescence quenching effectively characterizes these DESs and their interactions with nitro compounds.

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Area of Science:

Physical Chemistry
Materials Science

Background:

Hydrophobic deep eutectic solvents (DESs) are emerging as sustainable alternatives to traditional organic solvents and ionic liquids.
Their unique properties make them promising for various chemical applications, including sensing and separation.

Purpose of the Study:

To investigate the structural features and solute dynamics of a prototypical hydrophobic DES, TBAC-DA.
To evaluate the potential of pyrene fluorescence quenching as a tool for characterizing DESs and detecting nitro compounds.

Main Methods:

Utilized pyrene fluorescence spectroscopy to study a hydrophobic DES formed by tetra-n-butylammonium chloride (TBAC) and n-decanoic acid (DA).
Examined the temperature-dependent quenching of pyrene fluorescence by five different nitro compounds.
Analyzed fluorescence emission intensity, polarity, and excited-state decay dynamics.

Main Results:

All five nitro compounds dynamically quenched pyrene fluorescence in TBAC-DA, following Stern-Volmer kinetics.
Quenching efficiency varied, with nitromethane showing higher quenching in TBAC-DA compared to hydrophilic DESs and ionic liquids.
Diffusion behavior was found to be dependent on quencher structure, with individual pyrene-quencher pairs conforming to the Stokes-Einstein relation.

Conclusions:

Pyrene fluorescence is a robust method for characterizing hydrophobic DESs and their interactions.
Hydrophobic DESs like TBAC-DA can serve as effective media for the detection and assessment of nitro compounds.