The transition state region in nonsynchronous concerted reactions

Area of Science:

• Chemical Kinetics
• Computational Chemistry

Background:

• The intrinsic reaction coordinate (IRC) describes reaction pathways.
• Traditionally, the transition state (TS) region is associated with electronic activity.

Purpose of the Study:

• To investigate the spatial extent of electronic activity during chemical reactions.
• To analyze the behavior of electron flux and bonding changes along the IRC.

Main Methods:

• Analysis of critical and vanishing points of the reaction force along the IRC.
• Utilizing descriptors like synchronicity, reaction electron flux, and Wiberg bond orders.

Main Results:

• Five key coordinates define reactant, TS, and product regions on the IRC.
• Nonsynchronous reactions show electronic activity extending beyond the traditional TS region into reactant and product areas.

Conclusions:

• The TS region may effectively extend into reactant and product areas for nonsynchronous reactions.
• Understanding electron activity distribution refines models of chemical reaction dynamics.