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4,4'-Dimethylazobenzene as a chemical actinometer
Lorenzo Casimiro1, Leonardo Andreoni2,3, Jessica Groppi3
1Université Paris-Saclay, ENS Paris-Saclay, CNRS, PPSM-UMR 8531, 91190, Gif-sur-Yvette, France. lorenzo.casimiro@ens-paris-saclay.fr.
Summary
Researchers propose 4,4'-dimethylazobenzene as a novel chemical actinometer for measuring photon flux. This compound offers a reusable, stable, and easy-to-use alternative for quantitative photochemical analysis.
Area of Science:
- Photochemistry
- Chemical Actinometry
- Spectroscopy
Background:
- Chemical actinometers are crucial for measuring photon flux in photochemical reactions.
- Existing actinometers often suffer from drawbacks like complex data analysis, side reactions, and poor stability.
- A need exists for improved actinometers with simpler handling and reusability.
Purpose of the Study:
- To introduce 4,4 -dimethylazobenzene as a novel chemical actinometer.
- To evaluate its efficiency and suitability for photon flux determination.
- To highlight its advantages over conventional actinometers.
Main Methods:
- Utilizing 4,4 -dimethylazobenzene for E/Z isomerization upon irradiation at 365 nm.
- Measuring photon flux through quantitative analysis of the isomerization.
- Assessing the compound's reset capabilities (photochemical or thermal).
Main Results:
- 4,4 -dimethylazobenzene exhibits clean and efficient E/Z isomerization.
- Near-total conversion is achieved upon irradiation.
- The compound demonstrates potential for simple experimental methods and data treatment.
- Reusability after reset was confirmed.
Conclusions:
- 4,4 -dimethylazobenzene is a promising chemical actinometer for UV-visible photon flux measurements.
- Its properties offer a user-friendly and reusable alternative to current methods.
- This advancement simplifies quantitative photochemistry and photoreaction analysis.
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