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Probing Laser-Induced Heterogeneous Microenvironment Changes in Room-Temperature Ionic Liquids.

Renjun Ma^1,2, Xian Wang^1,2, Jialong Jie^1,2

¹Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People's Republic of China.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|August 24, 2017

Summary

External laser fields alter room-temperature ionic liquid (RTIL) microstructures, causing oxygen molecule redistribution. This laser-induced change affects porphyrin triplet-state dynamics, revealing potential for designing new chemical reactions.

Keywords:

ionic liquids laser spectroscopy oxygen porphyrinoids time-resolved spectroscopy

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Area of Science:

Physical Chemistry
Materials Science
Chemical Engineering

Background:

Modulating the microenvironment of room-temperature ionic liquids (RTILs) with external stimuli is crucial for understanding and designing field-induced chemical reactions.
Heterogeneous systems, such as RTILs, possess complex microstructures that can be influenced by external fields, impacting molecular behavior and reactivity.

Purpose of the Study:

To investigate the redistribution of oxygen molecules within RTILs due to microstructural changes induced by an external laser field.
To probe these microstructural changes by monitoring the triplet-state dynamics of porphyrin.
To explore the potential of using external stimuli to design novel reaction systems in RTILs.

Main Methods:

Application of an external laser field to induce microstructural changes in RTILs.
Simultaneous probing of these changes using the triplet-state dynamics of porphyrin.
Analysis of porphyrin triplet-state lifetime to infer microstructural and molecular rearrangements.

Main Results:

Observed redistribution of oxygen molecules correlated with laser-induced microstructural changes in RTILs.
A remarkably long-lived triplet state of porphyrin was detected after laser irradiation, indicating significant microstructural alterations.
Evidence suggests the induction of charge-shifted O2 molecules and/or rearrangement of intrinsic ions into polar domains via electrostatic interactions.

Conclusions:

External laser fields can effectively modulate the heterogeneous microenvironment of RTILs, leading to molecular redistribution.
The observed porphyrin triplet-state dynamics serve as a sensitive probe for these laser-induced microstructural changes.
These findings open avenues for designing RTIL-based reaction systems involving various molecules (e.g., O2, CO2, CS2) for diverse applications.