Exploring Selective Photochemistry on Metal Surfaces through Wavelength-Dependent Light Excitation

Area of Science:

• Surface Chemistry
• Photochemistry
• Materials Science

Background:

• Photochemical reactions offer precise control via light manipulation, independent of temperature.
• On-demand control of reaction pathways is a key advantage of photochemistry.
• Exploring photoinduced reactions on surfaces is crucial for advanced materials synthesis.

Purpose of the Study:

• To investigate photoinduced on-surface debrominated coupling reactions.
• To elucidate the mechanisms of photoreaction processes using varying wavelengths.
• To demonstrate selective debrominated coupling on gold surfaces using photochemistry.

Main Methods:

• Photoirradiation of adsorbates using wavelengths from 254 to 850 nm at room temperature.
• Analysis of photoreaction outcomes correlated with adsorbate electronic structure.
• Theoretical calculations to validate proposed reaction mechanisms.

Main Results:

• Photoinduced debrominated coupling was successfully triggered by photoirradiation.
• Charge transfer processes were identified to facilitate reactions in the near-infrared region.
• Direct intramolecular excitation under UV radiation showed the highest photoactivity, leading to selective coupling on Au(111).

Conclusions:

• Photochemistry provides a versatile tool for controlling surface reactions.
• Understanding electronic structure is key to elucidating photochemical mechanisms on surfaces.
• This work lays the groundwork for photochemistry applications in surface chemistry and materials science.