Nanosecond-scale single-molecule reaction dynamics for scalable synthesis on a chip

Area of Science:

• Chemical kinetics
• Single-molecule electronics
• Reaction mechanism elucidation

Background:

• Characterizing reaction intermediates is crucial for understanding and optimizing chemical reactions.
• Existing techniques lack resolution in the microsecond to nanosecond range, hindering the detection of transient intermediates.
• Complexity in catalytic systems often obscures reaction pathways and limits efficiency.

Purpose of the Study:

• To introduce a novel nanosecond-scale real-time single-molecule electrical monitoring technique.
• To directly observe and characterize previously undetected intermediates in chemical reactions.
• To elucidate complex catalytic mechanisms and optimize reaction yields.

Main Methods:

• Development of a nanosecond-scale real-time single-molecule electrical monitoring system.
• Application of the technique to study the Morita-Baylis-Hillman reaction.
• Utilizing electrical monitoring to visualize reaction pathways and intermediate dynamics.

Main Results:

• Direct observation of hidden intermediates in the Morita-Baylis-Hillman reaction.
• Clarification of proton transfer pathways and their quantitative contributions.
• Unveiling catalytic oscillation and proton quantum tunneling effects.
• Successful catalysis optimization using an electric field, achieving high turnover frequency (~5000 s⁻¹).

Conclusions:

• The developed technique provides unprecedented insight into reaction mechanisms at the nanosecond scale.
• This approach enables visualization and quantitative analysis of complex catalytic phenomena.
• The technique offers a new paradigm for mechanistic study and reaction optimization, with potential for scalable synthesis using integrated electronic devices.