Azobenzene photoisomerization quantum yields in methanol redetermined.

Area of Science:

• Photochemistry
• Molecular Spectroscopy
• Materials Science

Background:

• Azobenzene derivatives are widely studied for their photoresponsive properties.
• Accurate quantum yield data is crucial for understanding and optimizing photoisomerization processes.
• Previous quantum yield determinations for azobenzene may have inaccuracies.

Purpose of the Study:

• To re-determine the quantum yields of azobenzene photoisomerization in methanol.
• To improve the accuracy of molar absorption coefficients for cis- and trans-azobenzene.
• To provide reliable data for azobenzene-based optical switching technologies.

Main Methods:

• Utilized newly obtained molar absorption coefficients for cis- and trans-azobenzene isomers.
• Performed precise quantum yield measurements in methanol solution.
• Employed actinometry for accurate light intensity determination.

Main Results:

• Redetermined quantum yields differ substantially from previously reported values.
• Discrepancies are most pronounced in the nπ* absorption band region.
• The revised data offers a more accurate photophysical characterization.

Conclusions:

• The study provides revised, more accurate quantum yields for azobenzene photoisomerization.
• Findings highlight the importance of precise molar absorption coefficients.
• The results are critical for the advancement of azobenzene-based optical switching devices.