Understanding Ball Milling Mechanochemical Processes with DFT Calculations and Microkinetic Modeling

Area of Science:

• Sustainable Chemistry
• Computational Chemistry
• Mechanochemistry

Background:

• Mechanochemistry is a rapidly growing field with significant potential for green chemistry applications.
• However, the fundamental mechanistic understanding of mechanochemical processes remains incomplete.

Purpose of the Study:

• To investigate the mechanistic underpinnings of mechanically activated reactions using computational tools.
• To analyze two specific reactions previously studied experimentally: Diels-Alder reactions and sulfonylguanidine synthesis.

Main Methods:

• Density Functional Theory (DFT) calculations.
• Continuum and microkinetic modeling.
• Analysis of mechanically activated procedures.

Main Results:

• Computational models successfully reproduced experimentally observed reaction times for both Diels-Alder and sulfonylguanidine synthesis.
• The study indicates that ball milling-accelerated reactions likely proceed through the same mechanisms as their solution-phase counterparts.
• Key parameters like initial concentrations and dielectric constant were found to be sensitive factors.

Conclusions:

• The findings suggest a unified mechanistic picture for mechanochemical reactions, applicable to both solution and solid-state transformations.
• This work provides a computational framework for understanding and optimizing mechanochemical processes.
• The results have broad implications for the broader field of sustainable chemistry and reaction engineering.