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Dramatic steric behavior in electron transfer from various donors to CF3Br.

Peter W Harland¹, Philip R Brooks

¹Chemistry Department and Rice Quantum Institute, Rice University, Houston, TX 77251, USA.

Journal of the American Chemical Society

|October 23, 2003

Summary

Alkali metal atoms donate electrons to CF(3)Br molecules, forming ion pairs. Bromide ions predominantly form from attack at the bromine end, while fluoride ion formation shows varied donor behavior.

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Area of Science:

Chemical Physics
Molecular Dynamics
Atomic Collisions

Background:

Electron transfer reactions are fundamental in chemistry.
Understanding molecular orientation effects is crucial for reaction dynamics.
Alkali metal interactions with halogenated molecules provide insights into charge transfer processes.

Purpose of the Study:

To investigate electron donation from alkali metal atoms to CF(3)Br molecules.
To analyze the formation and origin of negative ions produced.
To explore the role of molecular orientation and donor species in the reaction outcome.

Main Methods:

Coincident time-of-flight mass spectroscopy was employed.
Collisions between alkali metal atoms and oriented CF(3)Br molecules were studied.
Analysis of positive and negative ion products was performed.

Main Results:

Electron donation leads to the formation of alkali metal cation/CF(3)Br anion pairs.
Bromide ions (Br-) are the most abundant negative ions, preferentially formed via attack at the bromine end.
Fluoride ion (F-) formation exhibits distinct donor-dependent behavior, with Na and K favoring the CF(3) end and Cs favoring the Br end.

Conclusions:

The reaction is sterically controlled, with bromide formation showing high symmetry across alkali metal donors.
Donor-specific interactions with the transient CF(3)Br- intermediate influence fluoride ion formation pathways.
The study highlights the interplay between electron transfer, molecular geometry, and donor properties in chemical reactions.